PROC. ENT. SOC. WASH., VOL. 54, NO. 2, APRIL 1952 69 THE SIMULIIDAE OF ALASKA (Diptf.ra) By Alan Stone, Bureau, of Eniomology and Plant Quarantiiie, Agricultural Research Administration, United States Department of Agriculture The intensive study of the biology of the Alaskan biting Diptera, undertaken in 1947 and 1948 by the Alaskan Insect Project,' has resulted in 36 species of black flies being known from that Territory, more than from any state of the United States or any Province of Canada. I had hoped to incorporate the descriptions of the five new species and of formerly un-known pupae or sexes in a complete revision of the Nearctic Simuliidae. Completion of that task is not foreseeable in the immediate future, so in order to make names available for six species I am presenting' this preliminary paper. A more com-plete treatment of all the species here included, with further illustrations and descriptions, will have to await the complete revision. The bibliographic citations given are only those of the original proposal of the valid or newly synonymized names and of the best available descrii)tions. I have described in detail only that which is new. For the parts of the male termi-nalia I have adopted the terms used by Freeman 1950 (Ann. Trop. Med. «& Parasit. 44(2) : 146-152), the adminiculum of authors becoming the ventral plate, and the adminicular arms the parameres. I have given onl.v the Alaskan distribution for all but the new species, leaving the entire distribution of the described species for the later paper. Since a paper is being prepared on the biology of the Alaskan black flies, I here omit seasonal distribution or other biological information. In the distribu-tional data the numbers following the Alaskan roads indicate the distance on the road from its beginning, as shown on the accompanying map prepared by Kathryn M. Sommerman. I am particularly indebted to Dr. K. I. Sailer and Dr. Kathryn M. Sommerman, and their assistants, who greatly extended the work in 1948 that T began in 1947. Keys to Alaskan Genera, Adults 1. A bulla behind eye laterally; scutum with stout erect hairs but no fine recumbent hairs Gymnopais Stone No bulla behind eye; scutum usually with fine recumbent hairs but never with stout, erect ones 2 'This project was conducted under a transfer of funds from the De-ptutment of the Army to the Bureau of Entomology and Plant Quaran-tine, U. S. Department of Agriculture.
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