No. 3.] HYGROCELEUTHUS AND DOLICHOPUS. 129 



portion in front. Femora and tibiae yellow. Middle tarsi compressed, 

 ornamentation dorsal on last four joints. Wings thickened at tip of first 

 vein and incised at fifth. Tegula cilia black, a few yellow inside. 



Female. Face silvery, broader. Antennae shorter, first joint hairy above, 

 sometimes infuscated above. Vertex green. Abdomen more cupreous, 

 and anterior and middle tarsi slightly lighter than in the male. Posterior 

 femora with two macrochaetae near tip on outer side. Wing incision not 

 very deep. 



This species has a greater distribution than any of the other 

 species, except plumipes. It has been taken at various places 

 in the Northern States from Connecticut to Idaho. This is 

 the commonest species, and, aside from WJieelerii, the only 

 species yet found east of the Dakotas. 



Latipes, var. ? cognatus. Two specimens vary from the type 

 as follows and may possibly represent another species. Pos- 

 terior tibiae black at tip and hind tarsi totally black. Vertex 

 violet. Posterior femora each with only one macrochaeta on 

 outer side near apex. One female from Woods Holl, Mass., 

 July 19, 1899, and another female from Pullman, 111., August 

 7, 1897. 



Hygroceleuthus Aldrichii Wheeler. 



Male. Length 4-5 mm. Face with silvery white dust below, ochreous 

 above. Antennae black, first and second joints yellow below on mesial sur- 

 face. Arista moderately pubescent. Front green. Postocular cilia white 

 on lower two-thirds, black above. La- 

 mellae of hypopygium yellow with black 

 border and fringe of delicate black hairs. 

 Anterior coxae yellow, others dark. 

 Second, third, and fourth joints of 

 middle tarsi distinctly compressed and 

 fringed with stout black hairs. Anal 

 angle of wing bilobed, costal thickening 

 prominent and incision at tip of fifth 

 vein slight. Tegulae with long black 



FIG. 5. H. Aldrichii: a, male; b, female. 



Female. Length 4-5.5 mm. Face 



grayish-yellow. First joint of antennae almost entirely black. Tip of hind 

 tibiae usually black. Incision at tip of fifth vein slight. Anal angle not 

 bilobed, and tarsi but very slightly compressed. 



Numerous specimens examined, males and females. From 

 Idaho, Wyoming, and Colorado. 



