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LIFE CYCLE OF THE NYMPH FLY PALAEODIPTERON WALKERI IDE 1965 (DIPTERA: NYMPHOMYIIDAE) IN THE WHITE MOUNTAINS OF SOUTHERN QUÉBEC

Published online by Cambridge University Press:  31 May 2012

P.P. Harper  and
Michel Lauzon
P.P. Harper
Affiliation:
Département de Sciences biologiques, Université de Montréal, C.P. 6128, Succursale “A”, Montréal, Québec, Canada H3C 3J7
Michel Lauzon
Affiliation:
Département de Sciences biologiques, Université de Montréal, C.P. 6128, Succursale “A”, Montréal, Québec, Canada H3C 3J7
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Abstract

Collections of larvae over 1 year in the River Clinton in the White Mountains of southern Québec indicated that Palaeodipteron walkeri Ide is bivoltine and that there are five larval instars. In April, larvae were in their fourth and fifth instars. Adults emerging in May and June gave rise to a summer generation in which most individuals emerged in August and September. The offspring of these adults, together with stragglers from the summer generation, formed an overwintering generation. Overwintering was completed in the larval stage, mainly the third and fourth instars. There was some growth in winter and development increased in the spring. Our data were compared with previously published observations; although no discrepancy occurred, our interpretation was different. Previous schemes proposed for the life cycle in this species were based on few specimens and lacked winter observations.

Résumé

Des récoltes périodiques de larves durant 1 année dans la rivière Clinton dans les Montagnes Blanches du sud du Québec permettent de décrire le cycle bivoltin de Palaeodipteron walkeri Ide. Il y a cinq stades larvaires. En avril, les larves sont aux quatrième et cinquième stades. Les adultes, qui émergent en mai et juin, produisent des larves qui atteignent leur maturité et se métamorphosent en août et septembre. Les larves nées de ces adultes de fin d’été jointes à quelques larves retardataires nées au début de l’été forment la population d’hiver. L’hiver est passé aux stades larvaires trois et quatre. La croissance est ralentie en hiver, mais elle accélère tôt au printemps. Nos données s’accordent bien avec les observations déjà disponibles dans la littérature, mais notre interprétation du cycle est différente. Sans doute, les auteurs précédents ne possédaient-ils que peu de matériel et ils n’avaient pas échantillonné en hiver.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 7 , July 1989 , pp. 603 - 607
Copyright
Copyright © Entomological Society of Canada 1989

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