EJE, vol. 95 (1998), issue 4

Temporal correlation between ecdysteroids and mitotic activity in larval tissues of Clitumnus extradentatus (Phasmoptera: Phasmatidae: Lonchodinae)


Eur. J. Entomol. 95 (4): 493-499, 1998

A comparative study of mitotic activities and haemolymph ecdysteroid levels was performed in the phasmid Clitumnus extradentatus. Temporal correlation was found between increases in mitotic frequency in mandibular and general epidermis, and variations of ecdysteroid levels in the haemolymph of the insects. Whereas, mitotic waves occurring in the fat body cells or in the basal cells of the midgut did not appear to be strictly correlated with these hormonal variations. During the fourth larval instar of this phasma; an accurate study of mitotic figures, monitored from histological sections, indicated a time-lag in their stimulation according to...

Book Review: Aquatic Insects of North Europe: A Taxonomic Handbook. Vol. 2


Eur. J. Entomol. 95 (4): 500, 1998

Nilsson A. (ed.): Aquatic Insects of North Europe: A Taxonomic Handbook. Vol. 2. Apollo Books, Stenstrup, 1997, 440 pp.

The Argentine ant, Linepithema humile (Hymenoptera: Formicidae: Dolichoderinae) is sensitive to semiochemicals involved in the spacing behaviour in the bird cherry-oat aphid Rhopalosiphum padi (Sternorrhyncha: Aphididae)


Eur. J. Entomol. 95 (4): 501-508, 1998

The behavioural response of an aphid-tending ant, the Argentine ant Linepithema humile, to semiochemicals related with spacing behaviour in the aphid Rhopalosiphum padi (L.) was evaluated. The compounds involved were 6-methyl-5-hepten-2-one (MHO), 6-methyl-5-hepten-2-ol (MHOH), and 2-tridecanone (2-T). Hexane solutions of these semiochemicals either singly or mixed, and extracts obtained by trapping volatile compounds from wheat seedlings either alone or infested with two different densities of aphids were used as stimuli in olfactometric bioassays. Ants showed attraction to volatile extracts from plants infested at both densities, and...

Population ecology and clone dynamics of the galling aphid Geoica wertheimae (Sternorrhyncha: Pemphigidae: Fordinae)


Eur. J. Entomol. 95 (4): 509-518, 1998

Geoica wertheimae induces spherical galls on its primary host, Pistacia palaestina (Anacardiaceae). We studied the temporal changes in gall size and aphid clone size, as well as gall distribution and abundance on marked trees during two consecutive years. The density of galls (per shoot and per leaf) was low during the study period, and gall distribution was clumped. Gall abundance varied greatly among trees, but gall abundance and tree budburst phenology were uncorrelated. Galls increased eight-fold in volume during the season, in parallel with the increase in aphid clone size, from one individual to several hundred aphids per gall....

Bionomics and ecology of Bemisia tabaci (Sternorrhyncha: Aleyrodidae) in Italy


Eur. J. Entomol. 95 (4): 519-527, 1998

The development of a B-biotype Bemisia tabaci Italian colony was studied on bean at 9 constant temperatures (15, 16, 17, 20, 23, 26, 29, 32, 35C). The developmental time from egg-to-adult varied from 70 days at 16C to 22 at 26C and higher temperatures. A thermal requirement for egg-to-adult development of 307 day-degrees was calculated, based on a lower developmental threshold of 11.53C. The survival of egg, nymph and adult whiteflies was investigated at 0, 2, 4, and 6C on broad bean for periods of 1-8 days. The adult was the most cold-sensitive stage, while the egg and nymph showed a similar level of cold resistance. The effect of sub-lethal...

Book Review: African Cereal Stem Borers: Economic Importance. Taxonomy, Natural Enemies and Control.


Eur. J. Entomol. 95 (4): 528, 1998

Polaszek A. (ed.): African Cereal Stem Borers: Economic Importance. Taxonomy, Natural Enemies and Control. CAB International, Wallingford, 1998, xii + 530 pp.

Six-year Malaise trapping of the leaf miner Chromatomyia fuscula (Diptera: Agromyzidae) and its chalcidoid parasitoid complex in a barley field and its boundary


Eur. J. Entomol. 95 (4): 529-543, 1998

The univoltine leaf miner Chromatomyia fuscula (Zetterstedt) (Diptera: Agromyzidae) is a regular cereal pest in Scandinavia. The fly and its most important parasitoids were studied in a 15.5 ha organically-grown field in southern Norway. Each year (1992-1997), one Malaise trap was placed in the spring barley part (2.5 ha) of the field, and (except for 1994) another along the nearest wooded boundary for the whole season. Because of crop rotation, the traps changed position every year. C. fuscula and 15 parasitoid species previously reared from C. fuscula were sorted from the catches.
Few C. fuscula were trapped in the...

Plant-mediated effects of soil salinity on a gall-inducing caterpillar Epiblema scudderiana (Lepidoptera: Tortricidae) and the influence of feeding guild


Eur. J. Entomol. 95 (4): 545-557, 1998

A greenhouse experiment was conducted to study the indirect effects of soil salinity on a caterpillar that induces gall formation on a non-halophilic plant. Larvae of Epiblema scudderiana (Clemens) were allowed to feed on potted goldenrods (Solidago altissima L.) treated with 3 concentrations of NaCl (0, 8,000, 16,000 PPM). Experiments were also carried out with the larvae of two species of leaf beetles, Trirhabda borealis Blake, a leaf-chewer, and Microrhopala vittata F., a leaf-miner, to determine the influence of feeding guild. Adding salt to the soil affected both the plant and insect herbivores. The biomass of roots...

Book Review: Ephemeroptera and Plecoptera. Biology - Ecology - Systematics.


Eur. J. Entomol. 95 (4): 558, 1998

Landolt P. & Sartori M. (eds): Ephemeroptera and Plecoptera. Biology - Ecology - Systematics. Mauron + Tinguely & Lachat SA, Fribourg, Switzerland, 1997, xi + 569 pp.

Habitat use of the fungivorous beetle Bolitophagus reticulatus (Coleoptera: Tenebrionidae): Effects of basidiocarp size, humidity and competitors


Eur. J. Entomol. 95 (4): 559-570, 1998

Habitat use of Bolitophagus reticulatus (L.) (Coleoptera: Tenebrionidae), living in the basidiocarps of Fomes fomentarius (L.) Kickx, was investigated in three forest areas in south-eastern Norway: (1) a continuous, coniferous forest, (2) an agricultural area with mostly deciduous forest islands in a matrix of cultivated land and (3) a homogeneous, old deciduous forest stand. B. reticulatus was almost exclusively found inside dead basidiocarps. The size of the basidiocarp was the most important variable for predicting the probability of B. reticulatus presence in the basidiocarps from all three study areas. Drier basidiocarps...

Differential parasitisation of adult and pre-imaginal Coccinella septempunctata (Coleoptera: Coccinellidae) by Dinocampus coccinellae (Hymenoptera: Braconidae)


Eur. J. Entomol. 95 (4): 571-579, 1998

The parasitoid wasp Dinocampus coccinellae has been reported to parasitise adult, pupal and larval coccinellids. Field samples of larvae and pupae of Coccinella septempunctata, collected over 13 years in Britain, have failed to reveal any infected pre-imaginal individuals. The parasitisation rates of D. coccinellae into pre-imaginal and adult C. septempunctata were assessed in both choice and no-choice tests. Observations and test results revealed that British D. coccinellae have a strong preference to oviposit in adult coccinellids rather than larvae or pupae. This preference decreases as wasps age if denied oviposition...

Book Review: Parasitic Wasps.


Eur. J. Entomol. 95 (4): 580, 1998

Quicke D.L.J.: Parasitic Wasps. Chapman & Hall, London, Weinheim, New York, Tokyo, Melbourne, Madras, 1997, xviii + 470 pp.

Willemia anophthalma-group (Collembola: Hypogastruridae): Systematics, new species, distribution and habitats


Eur. J. Entomol. 95 (4): 581-592, 1998

Two new species belonging to the genus Willemia are described: W. bedosae sp. n. and W. christianseni sp. n. Redescriptions of Willemia dubia Christiansen & Bellinger, 1980 and W. similis Mills, 1934 are provided. Willemia vashtia Wray, 1950 is a new synonym of W. similis. These four species and four other of the genus constitute the Willemia anophthalma-group. This group is characterized by one feature not shared by the other species of the genus: the presence of setae a l on abdominal sternum IV. A comparative table and an identification key are given for these eight species, as well...

Liassotettigarcta africana sp. n. (Auchenorrhyncha: Cicadoidea: Tettigarctidae), the first Mesozoic insect from Tunisia


Eur. J. Entomol. 95 (4): 593-598, 1998

A new Lower Cretaceous cicada, Liassotettigarcta africana sp. n. (Tettigarctidae), is described From Tunisia, based on forewing impression. A brief overview of African fossil insects is presented.

The Lophopidae (Hemiptera: Fulgoromorpha): Description of three new genera and key to the genera of the family


Eur. J. Entomol. 95 (4): 599-618, 1998

Three new genera containing five new species of Lophopidae are described: Maana colorata, Maana erythina, Maana oriomoensis, Podoschtroumpfa magna and Pseudotyxis malimoenensis. A new key to the genera of Lophopidae is also provided, followed by a cheklist of the distribution of the genera and their host plants.

On the systematic position of Seychellesius Carvalho (Heteroptera: Miridae)


Eur. J. Entomol. 95 (4): 619-622, 1998

The monotypic genus Seychellesius Carvalho is transferred from the subfamily Cylapinae to Deraeocorinae, tribus Termatophylini Renter. Redescriptions and illustrations of the genus and its single species Seychellesius niger (Distant) are given.

Description of larvae of Aepopsis robini (Coleoptera: Carabidae: Trechini)


Eur. J. Entomol. 95 (4): 623-627, 1998

First and third instar larvae of Aepopsis robini (Laboulbène, 1849) are studied, redescribed, and illustrated. The larvae are characterised by three unique and likely autapomorphic character states within known members of the supertribe Trechitae: (1) apex of antennomere 4 has only one conical sensillun 1; (2) setae FR10 and FR11 on frontale are removed basally on dorsal surface from the apical margin; (3) terga of meso- and metathorax lack pore MEa, and abdominal terga 1-8 lack pore TEa.

Notes on the Palaearctic species of Aulacochthebius, with a description of A. libertarius sp. n. from the Moroccan Anti Atlas (Coleoptera: Hydraenidae)


Eur. J. Entomol. 95 (4): 629-637, 1998

Aulacochthebius libertarius sp. n. is described from the Moroccan Anti Atlas. The aedeagus of A. exaratus (Mulsant) and A. narentinus (Reitter), the two other known Palaearctic species of the genus, are figured, and their similarities discussed. The Palaearctic species of Aulacochthebius do not seem to form a natural group, A. narentinus and A. libertarius sp. n. being more similar to some Ethiopian and Oriental species.

Book Review: Checkered Beetles: Illustrated Key to the Cleridae and Thanerocleridae of the Western Palaearctic.


Eur. J. Entomol. 95 (4): 637-638, 1998

Gerstmeier R.: Checkered Beetles: Illustrated Key to the Cleridae and Thanerocleridae of the Western Palaearctic (bilingual - English + German). Margraf, Weikersheim, 1998, viii + 241 pp.

Overwintering survival in the seven spot ladybird, Coccinella septempunctata (Coleoptera: Coccinellidae)


Eur. J. Entomol. 95 (4): 639-642, 1998

An East Anglian population of the seven spot ladybird Coccinella septempunctata was studied to identify factors that influenced overwintering survival. For their body size, individuals that were still foraging in October were significantly lighter than those taken from stable aggregations. Ladybirds taken from aggregations (and hence those that had stopped foraging naturally) suffered just 9% mortality overwinter, compared with 72% mortality in a sample of active ladybirds that were prevented from continued foraging. Even after accounting for their lower relative weight, these active ladybirds suffered disproportionately higher mortality.

Prediuresis in female Phlebotomus sandflies (Diptera: Psychodidae)


Eur. J. Entomol. 95 (4): 643-647, 1998

Sandfly females, while feeding on the host, excrete urine to concentrate proteins of the bloodmeal and restore weight and water balance. This process, analogous to prediuresis in mosquitoes, was observed in 100% of Phlebotomus papatasi (Scopoli) and 85% of P. duboscqi Neveu-Lemaire females studied. Individual females, however, differed in duration of prediuresis and in the number of ejected urine droplets. In both species the prediuresis generally started 1-2 min after the commencement of feeding and the variation in urine production was positively correlated with the length of feeding. The first one or two droplets were opaque whitish...