372 CHARLES T. BRUES. 



conspicuous; in the female they are of the usual size and slightly yellowish at 

 the base; arista pubescent. Paipi light yellow, strongly bristly. Proboscis of 

 female projecting, stout and horny. Thorax shining black, hairy, with one pair 

 of dorsocentral and two marginal scutellar bristles. Abdomen black. Legs yel- 

 lowish brown, the anterior pair lighter. Posterior femora ciliated below on api- 

 cal half, their tibige without any rows of small bristles on the outer side; four 

 posterior tibife each with a single delicate apical spur. Wings hyaline, the costal 

 vein not quite reaching to the middle of the wing, its cilia short and closely placed. 

 Third vein far from the costa at its base and forked very near the apex. Tip of 

 first vein one and two-thirds times as far from humeral vein as from the tip of the 

 third; fourth vein slightly but evenly curved, recurved at the extreme tip ; fifth 

 vein slightly diverging from the fourth to its tip, which is as far behind the 

 wing tip as the fourth is before it; seventh vein faint but distinct. Halteres 

 yellowish in the female, piceous in the male. 



I have seen only the original types of this species, which are 

 from AVood's Hole, Mass. 



It is quite easily known by the stout, horny proboscis of the 

 female and the enlarged third antennal joint of the male. 



Iphioclisela (?) sp. innom. (Plate viii, fig. 46.) 

 There is a single male, collected by Mr. C. W. Johnson, at Dela- 

 ware Water Gap, N. J., July 12th, which belongs to an undescribed 

 species. As the antennae and palpi of the specimen are lost, I have 

 not undertaken to describe it. It can be readily recognized by the 

 fact that the hind tarsi are enlarged and flattened (see fig. 46). Dahli 

 Beck, and coronata Beck, have the fore tarsi enlarged in the male, 

 but this is the only form, so far as I am aware, in which the hind 

 tarsi are peculiar. There are no proclinate bristles on the front, 

 but the absence of bristles on the legs and the presence of a median 

 furrow on the front indicate its position here. There are only three 

 rows of frontal bristles, the lower two of which consist of two median 

 reclinate bristles only. 



APOCEPHALUS Coq. 

 Coquillett, Proc. Ent. Soc. Wash., iv (1901). 

 Head hemispherical, eyes large, Front broad, its bristles all re- 

 clinate, arranged in four rows; anterior row consisting of two median, 

 next row of two, and two upper rows each of four bristles. Ocelli 

 large. Antennae large, their cavities small, third joint oval or conical, 

 with an apical arista. Proboscis small, palpi with few and very weak 

 bristles. Thorax strongly arched above. Wings large, the third vein 

 forked near the apex, four light veins present. Legs rather long and 

 slender, without bristles except for one tibial spur on each of the pos- 



