ZooL.— Vol. II.] WHEELER— DOLICHOPODIDM. 53 



distinctly shorter and thicker than the second. Wings gray, much narrowed 

 towards the base, so that the anal margin which is fringed with delicate hairs 

 runs close to the sixth vein; near the tip of the fifth vein the posterior margin 

 forms a distinct sinus. Third and fourth veins parallel, the latter terminating 

 in the tip of the wing; distal segment of the fifth vein about two and one-half 

 times as long as the posterior cross-vein, which is short; discal cell short and 

 narrow. Halteres and tegulee light yellow; the latter edged with yellowish 

 brown and bearing a few very long delicate white cilia. 



A single specimen from Natrona, Pennsylvania, (Au- 

 gust I, 1895), sent me by Mr. C. W. Johnson, 



This very pretty species resembles Loew's Syjnpycntcs 

 (Nothosyni-pycmis) frontalis, but may be readily distin- 

 guished by the peculiar densely plumose arista and the 

 structure and ornamentation of the fore tarsi. In the fore 

 tarsus of the male of Loew's species the first joint is 

 extremely short and not quite as long as the last one, 

 the second almost as long as the two following together, 

 the third considerably shorter than the fourth joint, which 

 is fringed on its upper side with curved hairs. In Notho- 

 sympycnus fortunatus the third joint is much longer than 

 the fourth and both the third and fourth joints are fringed. 

 The long bristle on the second joint of N. fortunatus seems 

 not to occur in N. frontalis Loew. 



52. Nothosympycnus vegetus, sp. nov. 

 Plate III, Figs. 76-79. 



Male. Length 2.5-3.25 mm.; length of wing 2.75-3 mm. Palpi and pro- 

 boscis very small, piceous. Face very narrow, covered with white dust; 

 eyes almost meeting below. Antennte brownish black; first joint robust, 

 second small, third large, oval, evenly rounded anteriorly, nearly twice as 

 long as broad, covered with grayish pile and bearing near the base on the 

 dorsal side a very long, scarcely pubescent arista, which terminates in a black 

 lamel. Front metallic violet. Postocular cilia snow-white. Thorax varying 

 from dull green to black with cupreous and blue reflections. Scutellum 

 metallic blue. Abdomen bronze black, venter and the sides and bases of 

 the second, third and fourth segments yellow. Hypopygium small; append- 

 ages yellowish brown, short, scarcely protruding. Pleurae bluish green, 

 thickly covered with white dust; metapleurae yellowish below. Coxae yel- 

 low, middle pair somewhat infuscated towards their bases; fore pair with a 

 few yellowish brown hairs near their tips; hairs on the middle and hind pairs 

 black. Legs yellow, hind tibise and tips of hind femora brown; hind tarsi 



