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Ecology of Two Prosimulium Species (Diptera) with Reference to their Ovarian Cycles

Published online by Cambridge University Press:  31 May 2012

L. Davies
L. Davies
Affiliation:
Entomology Research Institute, Research Branch, Canada Department of Agriculture Ottawa, Ontario
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Extract

Prosimulium fuscum Syme and Davies, P. mixtum S. and D. and P. fontanum S. and D. form a complex of closely-related and largely sympatric species formerly known in North America (Twinn, 1936; Stone and Jamnback, 1955) under the single name P. hirtipes Fries, a well known species in the northern Palaearctic. The first step in demonstrating the multiple nature of the forms grouped under this name in North America was taken by Rothfels (1956) who showed by study of rhe larval salivary gland chromosomes that at least three non-interbreeding forms were present in eastern Canada. L. Davies (1957a) concluded from a study of specimens of all life-stages that none of the North American forms agreed with European P. hirtipes. A further step in the process was afforded by the work of Syme and D. M. Davies (1958), which erected the three species named above as a result of anatomical study of cytologically defined material, and showed that adult females of P. fuscum and P. mixtum could be reliably separated, mainly by features of the genitalia. The present work may be considered as a further step in the study of the common Prosimulium of eastern North America, by providing information on their ecology, thus amplifying the cytological and anatomical conclusions arrived at in the papers cited above.

Type
Articles
Information
The Canadian Entomologist , Volume 93 , Issue 12 , December 1961 , pp. 1113 - 1140
Copyright
Copyright © Entomological Society of Canada 1961

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