aldru'h: dolichopus and hvgrocf.lkuthus. 25 



second abdominal segment. It reaches to llie middle of the fourth 

 segment in the specimen examined. A character shared by both sexes 

 that readily separates the species from crenatus is the flexure of the 

 fourth vein; it is much more pronounced in afflictus. The cilia of the 

 tegulae, yellow in crenatus, are black in afflictus. Osten Sacken's 

 short comparative description of the female of the former may be re- 

 peated for the female afflictus. 



Hygroceleuthus ciliatus; n. sp. 



Shining green, antennae black except inner side of first joint, cilia 

 of tegulae long and black. 



Male. Face covered with yellowish white pollen; palpi yellow, 

 proboscis brown. Front green, antennae long; first joint red and 

 somewhat enlarged on the inner side, above and on the outer side 

 with stout black hairs; second joint black, rather long but not en- 

 larged; third joint not very small, black with subapical bare arista. 

 Cilia of inferior arbit light yellow. 



Thorax shinning green, with strong bristles. Pleurae agreen, but 

 slightly dusted; the area before the humeral spiracle and above the 

 fore coxa has a black bristle and a few whitish hairs. Halteres and 

 tegulffi yellow, the latter with long black cilia. 



Abdomen green, somewhat bronzed, the sides of the first segment 

 have some white hairs. Lim-Ue of hypopygium small, black bordered 

 and fringed as usual. 



Fore coxa^ black on the posterior side; the anterior with fine white 

 hairs and three or four black bristles. Middle coxre black except at 

 tip, with white hairs and black bristles. Hind coxk yellow at tip. 

 Femora and tibiae yellow; tips of hind tibia: blackish. Tarsi simple, 

 black from tip of first joint. Wings narrow, hyaline, the costa viewed 

 at right angles to the wing is not thickened, still in a certain direction 

 there is a noticeable protuberance just beyond the end of the first 

 vein. The fourth vein is strongly curved forward, and ends far before 

 the apex of the wing. Posterior margin but little indented at the 

 fifth vein. 



Female. Face wider and shorter, costa simple. AntenUcX slightly 

 shorter, the third joint relatively larger. 

 Length, 4 mm.; of wing, the same. 

 Two males, Custer, S. D., two females, Wyoming. 



HygToaelauthus lamellicornis. 



Thomson, Eugonii^s Ucsa. 511. 114 (Doliclioinis). 



This species was based on a single female specimen, evidently a 

 near relative of afflictus and crenatus; but the rather lengthy descrip- 



