AMERICAN DIPTERA. 291 



Einpi«i birolor Bellardi (Fi^ 11-2. 113). 

 Mem. della Reale Accad. d. Soienze di Torino. Ser. 2. vol. xxi. p. 11*8. 



Fmuile. — Black, cinereous. Eyes widely separated ; front and face flat, black, 

 cinereous, dorsum of the thorax with two obsolete vitt«, pilose ; pile sparse, 

 black, stiff; plenrse and pectus concolorous with the thorax : halteres black, at 

 the base fascous. Abdomen depressed, black, cinerascent and black-pilose. Legs 

 wholly jet black, black tomentose. spinose, and pilose, the tomentum. spines and 

 hairs denser and longer on the inner and outer sides, but not arranged as regular 

 cilia. Wings rounded at the apex, uniformly and rather strongly fuliginous, sub- 

 hyaline at the extreme base, flavescent. 5 mm. 



Cuantla, Mexico (Saussure). Xumerou* specimens. Guerrero. 



The male ha^ the middle metatarsus very short, in the female the 

 tarsal joints are slender and gradually decreasing in length. The 

 male differs thus: eyes contiguous alK)ve; face more gray, narrower, 

 though its sides are still parallel ; hypopygium slightly ascending, 

 not large, the reddish yellow filament rather strongly recurved, 

 black outwardly, and with tip omcealed. Bristles on the legs 

 longer and denser, disposed in patches as in montezuma. Middle 

 metatarsi but little more than one-half the length of the following 

 joint ; wings uniformly clear, with a flavescent tinge, nerves weak. 



It may be thought that E. montezinna Wheeler et Melander is a 

 variety of this sf)eoies. It is indeed closely related. Here, also, 

 the middle metatarsi are short, though they are subequal to the 

 next joint, but the dark broader wings and lighter color of the legs 

 and hyp<"»pygiuni distinguish the form from bicolor. None of the 

 ten sf)ecimeus of bicolor examined shows any deviation from the 

 opaque jet black of the legs and body. Moreover, the hvpopvgial 

 filament of montezuma is less recurved and wholly reddish ; the 

 discal cell of the wings is deeper, while the outer cross vein is 

 strongly bent and perj>endicular to the sixth vein ; and the sub- 

 marginal cell is much shorter, more nearly equilateral. 



Einpis azfe«» Wheeler et Melander (Fig. 119 . 

 Biol. Cent. Am., Dipt. Suppl., Nov., 1901. p. 369. 



Female. — Black. Head thickly grayish-pollinose, the ocellar spot in some re- 

 flections showing black. Face shining black below, gray-poll inose below the an- 

 tennse. Antennse black, longer than the head: third joint gently tapering, as 

 long as the first: style minute. Probos<MS and labella reddish yellow, black at 

 the base, altogether about as long as the thon«x. Thorax opaque gray, variable 

 in color in different reflections: pile erect, black ; margin of the scutellum with 

 a row of long hairs. Legs yellow, with black hairs; femora, except the tip, 

 black ; last joint of all the tarsi brown or black. Wings uniformly yellowish 

 brown; anterior branch of the third vein very short, rectangular; fourth vein 



TBAXS. AM. KXT. SOC., XXVIII. AUGUST. 1902. 



