ZocJl— Vol. III.] KELLOGG— NET-WINGED MIDGES. 217 



Riley (1881) referring briefly to the finding of larvae and 

 pupas of this species in Watertown, New York, and else- 

 where later in that year. Comstock (1895) describes and 

 figures both larvae and pupae, and in a comparatively recent 

 paper (Kellogg, 1900) these stages were described in detail 

 by the writer, and an account of the life-history of the 

 species given as far as worked out. Young larvae 

 (2.5 millimeters long) were found abundantly in Coy Glen 

 (Ithaca, New York) on May 9 (1898); on May 14, in the 

 same place, the larvae were from 3 to 10 millimeters (full 

 grown) long, and the first pupae were noted; on May 17, 

 there were many new pupae but also still many larvae, and 

 these of all sizes from the smallest to the full grown ones; 

 on May 20, the pupae far outnumbered the larvae; and on 

 May 26, the larvae were scarce. No adults had yet issued. 

 On June i, the flies were found issuing, and by June 9, 

 most of the imagines had issued although there were still 

 pupae and even some larvae, mostly old. By the end of 

 June, there were no larvae or pupae left. On June 27 

 (1901), the females were found in large numbers, feeding 

 along Cascadilla Creek (Ithaca, New York), as already 

 described. Both of these streams (Cascadilla and Coy 

 Glen) have been watched by Professor Comstock through 

 the latter half of the summer and autumn but no other 

 generation appears. How long do the imagines live? When 

 and where are the eggs laid? 



On June 22 to 25, imagines of Bibioce-phala elegantulus 

 were found to be numerous among the boulders of Big 

 Thompson stream, Estes Park, Colorado (altitude 7,500 

 feet), where the stream breaks through the Willow Park 

 terminal moraine. At this time, old pupae and empty pupal 

 skins were found, but no larvae except two very young ones. 

 On August 10 to 12, the flies were found still common and 

 numerous larvae, young and old, but no pupae. In three 

 other nearby mountain torrents, viz., Wind Creek, Mill 

 Creek, and South Fork of Big Thompson, adults and old 

 pupae were found. A note made at this time is as follows : 

 " It seems to me that I have got here just as the last adults 



