Wll.l.lS TON: NEW DIl'TKRA. 67 



sides; the last three segments and the hypopygium with abundant 

 black pile Legs black, .black pilose, the coxae with some whitish 

 pile; the tarsi red, the hind tibiae more deeply so. Wings hyaline, 

 with a large black or deep brown spot before the apex, extending 

 across the wing; a narrow cloud along the last section of the fifth vein. 



Length, 16-18 mm. 



One specimen, Estes Park, Col., August (Prof. F. H. Snow). 



This species is strikingly like C. dasylloides Will, but differs in the 

 color of the antennae and facial pile, and in the wing-markings. 



Orthoneuromyia, gen. nov. (Asilidae). 



Front and face narrow, the former not widened above. Ocellar 

 tubercle without bristles. Face only a little convex on the lower 

 part, but little protuberant: thinly clothed, the mystax thin. First 

 two joints of the antennae of nearly equal length, third joint about 

 twice the length of the first two together, rather stout; style small or 

 rudimentary. Scutellum with four bristles, the median, broadly 

 separated pair, erect; the outer ones shorter. Abdomen elongate, of 

 nearly equal width throughout, the segments longitudinally convex; 

 finely punctulate; hypopygium not hidden, with a lateral, slender, 

 curved process, and a median, stouter, likewise curved, organ. Legs 

 stout, the hind metatarsi somewhat thickened; hind tibiae without 

 cilia on the inner side. Dorsum of thorax with three small bristles on 

 each side, one in front of the suture, one just behind it, and the third 

 on the post-alar callus. Marginal cells of the wings widely open; 

 the second vein terminates in the costa a considerable distance beyond 

 the confluence of the first vein by a well-marked curve; veins at the 

 outer ends of the discal and fourth posterior cells parallel, but not in 

 the same straight line, the two veins closing the cells separated by a 

 short section. 



The genus has the venation of Atoniosia, except that the first longi- 

 tudinal vein runs gradually into the costa, and is not separated from 

 it as in Atomosia. In my synopsis of the genera of the Asilidae, as 

 also in the Trans. Amer. Ent. Sue, vol. xi., p. 9, I located our 

 species of Laphystia and Trie/is among the Dasypogoninae, because 

 the marginal cell is not closed, the second vein terminating in the 

 costa at the tip of the first ,vein. The peculiar course of the two 

 veins, in these genera, as in the present, is not of the Dasypogonid 

 type, but rather of the Laphrid, and, notwithstanding the open cell, 

 they both find their most natural position near Atomosia. The 

 present genus differs from both Trie/is and Laphystia in the narrower 

 front, the presence of scutellar bristles, the structure of the hypopy- 

 gium, etc., as well as in the venation. 



