ZooL.— Vol. II.] WHEELER— DOLICHOPODID^. 39 



and a single projecting bristle near the tip on the outer side. Bristles on the 

 posterior legs similar to those in ^. cinereiventris. Wings hyaline gray, nar- 

 rowed towards their bases; third and fourth veins converging but slightly 

 towards their tips. Distal segment of fifth vein about one and one-half times 

 as long as the posterior cross-vein. Halteres yellow, with darker peduncles. 

 Tegulae brown, with delicate white cilia. 



Female. Length 3-4 mm.; length of wing 2.5-3 rnm- Palpi large, gray, 

 withdrawn under a roof-shaped projection, into which the epistoma of the 

 broad face is prolonged. Third joint of antennae scarcely longer than broad, 

 rounded, with only an indication of a point; arista distinctly dorsal, about 

 half the length of the eye, pubescent; second antennal joint with a distinct 

 thumb-shaped^ projection overlapping the inner side of the third joint; first 

 joint very short, lacking the proximal ventral projection of the male. Thorax, 

 scutellum and abdomen colored like those of the male. Hind femur with- 

 out the broad black band and hind tibia but very slightly infuscated at its 

 tip. Hind metatarsus without a recurrent sickle-shaped bristle and there is 

 no row of conspicuous bristles on the lower surface of the median femur. 

 Wings not narrowed towards the base. 



Many specimens of both sexes of this pretty species were 

 swept from low vegetation near water in the pine woods 

 back of Monterey, Calif., during July, 1896. 



The species resembles the eastern S. cinereiventris with 

 which the male has the recurrent metatarsal spine in com- 

 mon. S . cinereiventris, however, has entirely yellow hind 

 femora and fore coxse, and the bristles on the lower sur- 

 faces of its m.iddle femora are larger and more conspicuous 

 than they are in S. affinis. Loew's description of the 

 female of S. cinereiventris shows that this species must be 

 very similar to the female of the Calif ornian species. They 

 may be distinguished by the coloring of the fore coxae. 



40. Synarthrus strataegus, sp. nov. 



Plate HI, Figs. 60 and 61. 



Male. Length 4-4.5 mm. ; length of wing 3.5-4 mm. Face covered with sil- 

 very white dust. Antennae small, black; basal joint with a sharp ventral pro- 

 jection on its inner side and a few very short hairs on its mesial and upper 

 surface; second joint overlapping the third on the mesial side with a thumb- 

 shaped projection; third joint pointed, scarcely twice as long as broad, more 

 convex along its ventral than along its dorsal edge, covered with distinct but 

 delicate pile; ari.sta very nearly apical, about half as long as the eye, covered 

 with extremely short pubescence. Front bronze black. Postocular cilia 

 rather delicate, black above, glistening white below. Thorax and scutellum 



