ZooL— Vol. III.] KELLOGG— NET-IV I NG ED MIDGES. 189 



statement has been added of the more serious deficiencies 

 in our knowledge of the Blepharoceridce, and some sug- 

 gestions for the help of those who may be sufficiently 

 interested to undertake the work of filling up some of 

 these gaps. 



II. Descriptions of New Species. 



Of the four new species from California here described, 

 two are plainly to be ascribed to the genus Blepharocera, 

 of which the European species B. fasciata is the type 

 species, while the other two cannot be assigned to any one 

 of the other Blepharocerid genera as at present defined, 

 although both ought to be included in a single genus. 

 With a slight modification of the genus Bihiocephala^ 

 erected in 1875 by Osten-Sacken for the single Colorado 

 species, B. grandis, the two new species can be fairly 

 included with B. grandis in a single genus. And this 

 seems preferable to establishing a new genus for them. 

 As a matter of fact, Osten-Sacken, having but a single 

 species in his genus Btbiocepkala, goes so far in defining 

 the genus that he included in his generic diagnosis what 

 are, in the light of the new forms, better looked on as 

 specific characters. In addition to Osten-Sacken's species 

 and the two here mentioned, the genus Bibiocefhala as 

 thus widened would also include von Roder's genus 

 Agathon, established in 1890 for the single Nevada species 

 A. elegantulus, found also by Aldrich in Idaho and by the 

 writer in Colorado. This relationship of species is dis- 

 cussed in some detail in a succeeding portion of this 

 paper. 



I. Blepharocera jordani, sp. nov. 



Plate XVIII, Fig. i; Plate XIX, Fig. 3; Plate XX, Figs, i and 2. 



Eyes (Pl. XVIII, fig. i)) of both male and female bisected and nearly 

 contiguous; the upper part of each eye is composed of larger ommatidia 

 (apparent externally in the larger corneal facets) than the lower part; in the 

 female the upper part of the eyes is larger in proportion to the lower part 

 than in the male, and is prominent and bulging; in both sexes the upper 



