ART. 23 TWO-WINGED DOLICHOPODID FLIES VAN DUZEE 41 



are scarcely longer than those on the upper edge, the middle and 

 hind pairs also have a few black bristle-like hairs near the tip on 

 lower anterior edge; the black bristles on middle and hind tibiae 

 very small. Fore and middle tarsi yellow, a little darker at tip; 

 the joints of fore tarsi as 27-10-6-4^6. Hind tarsi (fig. 34) black 

 from the tip of the first joint, their joints as 23-17-12-8-6, the first 

 joint slightly enlarged at tip and with a projection which bears a 

 cluster of hairs, these usually form a thorn-like tip to the joint, 

 but sometimes they are a little more separated. Calypters and 

 halteres pale yellow, the former with white cilia. 



Wings slightly grayish, veins brown ; last section of fourth vein a 

 little bent at its basal third, nearly parallel with third beyond this 

 bend, ending in the apex of the wing; last section of fifth vein twice 

 as long as the crossvein. 



Described from five males taken by Dr. J. M. Aldrich at Lafayette, 

 Indiana, June 9 to July 31. 



Typ€.—M^\Q, Cat. No. 27053, U.S.N.M. 



There is quite a variation in the length of the third antennal joint, 

 the extent of the brown at tip of hind femora, tlie yellow of hind 

 tarsi and in the color of the hairs on the legs, still I think there can 

 be no doubt of their all being one species. 



37. ARGYRA (LEUCOSTOLA) SPINA, new species 



Male. — Length, 3.5 mm. Face narrow, silvery white. Palpi yellow 

 with white pollen and one black hair at tip. Front opaque with 

 white pollen. Antennae black; first joint bare above; third joint a 

 little longer than the two basal ones taken together, but little longer 

 than wide, rounded at tip ; arista a little longer than the antenna, in- 

 serted a little before the tip of the third antennal joint. Lower 

 orbital cilia white and rather short. 



Thorax shining green with white pollen on anterior portion, es- 

 pecially at the sides; scutellum with one pair of large marginal 

 bristles. Abdomen with the first segment green with black bristles 

 on the hind margin and a fcAv yellow hairs on the lower edge at the 

 sides; second segment yellow with a median green stripe, which 

 widens at fore and hind margins, it has long yellow hairs on the 

 lower edge of the sides; third segment black with a large yellow 

 spot on each side; fourth, fifth, and sixth segments black; last four 

 segments thickly covered with silvery white pollen. Hypopygium 

 (fig. 32) black, its appendages yellow; outer lamellae short, trian- 

 gular, with delicate hairs above and a long one at tip ; there are two 

 pairs of inner appendages. 



Coxae yellow, with yellow hairs, their bristles black in certain 

 lights, viewed in other lights they are yellow. Femora and tibiae 



