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ASPECTS OF THE BIOLOGY OF FEMALE CHRYSOPS UNIVITTATUS (DIPTERA: TABANIDAE) IN SOUTHWESTERN QUEBEC

Published online by Cambridge University Press:  31 May 2012

D. J. Leprince  and
D.J. Lewis
D. J. Leprince
Affiliation:
Department of Entomology, Macdonald Campus of McGill University, Ste. Anne de Bellevue, Quebec H9X 1C0
D.J. Lewis
Affiliation:
Department of Entomology, Macdonald Campus of McGill University, Ste. Anne de Bellevue, Quebec H9X 1C0
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Abstract

Chrysops univittatus Macquart females were more abundant in late July and early August in southwestern Quebec. Dry-ice baited canopy trap collections consisted of 55% (n = 177) of the nulliparous and 77% (n = 91) of the parous females. Incidence of nectar feeding, as determined by cold anthrone test, was 73% (n = 244) and 96% (n = 268) of the females contained sperm; no difference was found between parous and nulliparous females. This species is anautogenous, and only one gonotrophic cycle was recorded following ovary dissection. Number of ovarioles was correlated with body size (as determined by wing length) by linear regression analysis.

Résumé

Les femelles Chrysops univittatus Macquart furent abondantes de la fin juillet au début d'août dans le sud-ouest du Québec. Les pièges canopy accompagnés de glace sèche ont recoltés respectivement 55% (n = 177) et 77% (n = 91) des femelles nullipares et pares. Le pourcentage des femelles contenant du nectar était de 73% (n = 244) et celles contenant des spermatozoïdes 96% (n = 268) : il n'y avait pas de différence entre les femelles nullipares et pares. Cette espèce est anautogène et un seul cycle gonotrophique fut detecté par l'analyse des ovaires. Le nombre d'ovarioles et la taille des individus (déterminée par la longueur de l'aile) furent analysées par une régression linéaire.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 4 , April 1983 , pp. 421 - 425
Copyright
Copyright © Entomological Society of Canada 1983

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