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The Rhagio dimidiatus Group in Western North America (Diptera, Rhagionidae)

Published online by Cambridge University Press:  31 May 2012

Maurice T. James
Maurice T. James
Affiliation:
Washington State University, Pullman
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Abstract

The Rhagio dimidiatus group in western North America consists of four species, all but one polytypic. Traditional taxonomic procedure has not been successfully applied to this complex, since the component taxa are variable and often poorly defined. Consequently, a quantitative approach, involving deme-by-deme comparison on the basis of the ten most significant differentiating characters, and interpreted in the light of geographic distribution, is used. The group is reviewed, a key presented, and the included forms described. New taxa are: R. maculifer styx, Montana, R. m. byersi, California, R. expansus expansus, Oregon, California, and R. e. franciscanus, California. R. dimidiatus albibarbis (Bigot) and R. maculifer concavus Leonard are given new status as subspecies.

Type
Articles
Information
The Canadian Entomologist , Volume 96 , Issue 3 , March 1964 , pp. 550 - 568
Copyright
Copyright © Entomological Society of Canada 1964

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