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FURTHER STUDIES ON THE BIOLOGY OF PYRRHARCTIA (ISIA) ISABELLA (LEPIDOPTERA: ARCTIIDAE): III. THE RELATION BETWEEN HEAD CAPSULE WIDTH AND NUMBER OF INSTARS

Published online by Cambridge University Press:  31 May 2012

Mark S. Goettel  and
Bernard J. R. Philogène
Mark S. Goettel
Affiliation:
Department of Biology, University of Ottawa, Ottawa K1N 6N5
Bernard J. R. Philogène
Affiliation:
Department of Biology, University of Ottawa, Ottawa K1N 6N5
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Abstract

Head capsule widths of laboratory-reared and mature field-collected larvae of P. isabella were measured. The number of larval instars varied from 7 to 10, yet in all larvae studied, average size and increment in the successive instars were the same for instars 1 to 3. In the latter instars, there was an inverse relationship between size of increment and prospective number of instars. Insects which completed 10 instars were only a little larger than those maturing after only 7 instars. These data fail to support Dyar’s rule.

Résumé

On a mesuré la largeur des capsules céphaliques des larves de P. isabella élevées en laboratoire et celles de dernier âge récoltées sur le terrain. Le nombre de stades larvaires variait de 7 à 10, mais dans tous les cas étudiés, la taille et l’augmentation moyennes des stades successifs étaient semblables pour les stades 1 à 3. Dans ces derniers cas, il y avait une relation inverse entre la valeur de l’augmentation et le nombre éventuel de stades. Les insectes qui ont complété 10 stades larvaires étaient légèrement plus gros que ceux atteignant leur maturité après 7 stades seulement. Ces résultats ne s’accordent pas avec la loi de Dyar.

Type
Articles
Information
The Canadian Entomologist , Volume 111 , Issue 3 , March 1979 , pp. 323 - 326
Copyright
Copyright © Entomological Society of Canada 1979

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