Spruce beetle (Coleoptera: Scolytidae) parasitoids: cephalic morphology of larvae and a key to species (Hymenoptera: Braconidae, Pteromalidae)

Cast exuviae from final-instar larvae of four species of hymenopterous parasitoids of Dendroctonus rufipennis (Kirby, 1837) were examined for diagnostic characters. The head capsules of Bracon tenuis Muesebeck and Walkley, 1951, Coeloides rufovariegatus (Provancher, 1880), Roptrocerus xylophagorum (...

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Bibliographic Details
Published in:Canadian entomologist 2006-02, Vol.138 (1), p.87-90
Main Authors: Wesley, Julia, Williams, Daryl J.M., Langor, David W., Spence, John R.
Format: Article
Language:English
Subjects:
bark beetles
Biological and medical sciences
Bracon
Bracon tenuis
Braconidae
Coeloides
Coeloides rufovariegatus
Coleoptera
Dendroctonus rufipennis
Dinotiscus dendroctoni
exuvium
Fundamental and applied biological sciences. Psychology
head
head capsule
Hymenoptera
insect morphology
insect taxonomy
Insecta
Invertebrates
Larvae
Morphology. Histology. Cytology
parasitoids
Pteromalidae
Roptrocerus xylophagorum
Scolytidae
taxonomic keys
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Summary:Cast exuviae from final-instar larvae of four species of hymenopterous parasitoids of Dendroctonus rufipennis (Kirby, 1837) were examined for diagnostic characters. The head capsules of Bracon tenuis Muesebeck and Walkley, 1951, Coeloides rufovariegatus (Provancher, 1880), Roptrocerus xylophagorum (Ratzeburg, 1844), and Dinotiscus dendroctoni (Ashmead, 1894) each displayed unique combinations of characters allowing discrimination among species. Head capsules are illustrated, and a key to species is presented. Nous avons examiné les exuvies des larves de dernier stade de quatre espèces d'hyménoptères parasitoïdes de Dendroctonus rufipennis (Kirby, 1837) à la recherche de caractères diagnostiques. Les capsules céphaliques de Bracon tenuis Muesebeck et Walkley, 1951, de Coeloides rufovariegatus (Provancher, 1880), de Roptrocerus xylophagorum (Ratzeburg, 1844) et de Dinotiscus dendroctoni (Ashmead, 1894) portent toutes des combinaisons uniques de caractères qui permettent l'identification des espèces. Nous présentons des illustrations des capsules céphaliques et un clé d'identification des espèces. [Traduit par la Rédaction]
ISSN:0008-347X
1918-3240
DOI:10.4039/n05-045