4 COQUILLETT [39] 



As might naturally have been expected, the greater number 

 of the species represented in the present collection are such as 

 occur over the more northern portion of this Continent, not ex- 

 tending farther southward than the mountains of New Hamp- 

 shire and Colorado. Besides the new genus Ornithodcs, which 

 belongs to the family Tipulidae, the most interesting addition to 

 our genera is the genus Telmatogeton, of the family Chirono- 

 midce, heretofore known only from St. Paul Island, in the 

 Indian Ocean. 



Family MYCETOPHILID^E. 

 Diadocidia borealis sp. nov. 



Head and antennae dark brown, two basal joints of the latter, also 

 the proboscis and palpi, yellow; thorax polished, yellow, the dorsum, 

 except the front corners, dark brown, scutellum yellow, metanotum 

 brown; abdomen dark brown, slightly polished, its hairs yellowish; 

 coxae and femora light yellow, tibiaa and tarsi brown, front tarsi 

 slender; knob of halteres yellowish brown; wings hyaline, densely 

 covered with short hairs, auxiliary crossvein present, tip of first vein 

 about opposite apex of anterior branch of the fifth. Length 4 mm. 

 A male specimen, collected June 3. 



Habitat. Lowe fnlet, British Columbia. 



Type. Cat. no. 5190, U. S. National Museum. 



Closely related to the European D. ferruginosa Meigen, of which 

 species the U. S. National Museum contains two specimens from the 

 White Mountains, New Hampshire ; but in that species the apex of the 

 first vein is far before the tip of the anterior branch of the fifth, the 

 auxiliary crossvein is wanting, etc. 



Hesperinus brevifrons Walker. 



Hfsperinus brevifrons WALKER, List Dipt. Ins. British Museum, I, p. 81, 

 1848. 



Popof Island, Alaska : A single specimen, collected July 8. This 

 species was originally described from Hudson Bay, British America, 

 and has been recorded from the mountains of New Hampshire and 

 Colorado. The genus Hesperinus has heretofore been placed in the 

 family Bibionidae, but it differs from all the other members of that 

 family by the elongated antennas. In this and other structural char- 

 acters it agrees very well with the members of the present family. 



