AMERICAN DIPTERA. 291 



Eiiipis bicolor Bellardi (Figs. 112, 113). 

 Mem. della Reale Accacl. d. Scienze di Torino, Ser. 2, vol. xxi, p. 198. 



Female.— B\a(ik, cinereous. Eyes widely separated ; front and face flat, black, 

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

 black, stiflF; pleurae and pectus concolorous with the thorax ; halteres black, at 

 the base fuscous. 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). Numerous specimens. Guerrero. 



The male has the middle metatarsus very short, in the female the 

 tarsal joints are slender and gradually decreasing in length. The 

 male differs thus: eyes contiguous above; face more gray, narrf)wer, 

 though its sides are still parallel ; hypopygium slightly ascending, 

 not large, the reddish yellow filament rather strongly recurved, 

 black outwardly, and with tip concealed. 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. montezuma Wheeler et Melander is a 

 variety of this species. 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 hypopygium distinguish the form from bicolor. None of the 

 ten specimens of bicolor examined shows any deviation from the 

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

 filament of montezuma is less recurved and wholly reddish ; the 

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

 strongly bent and perpendicular to the sixth vein ; and the sub- 

 marginal cell is much shorter, more nearly equilateral. 



Einpis azteca 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-pollinose below the an- 

 tennae. Antennae black, longer than the head; third joint gently tapering, as 

 long as the first; style minute. Proboscis and labella reddish yellow, black at 

 the base, altogether about as long as the thorax. Thorax opaque gray, variable 

 in color in diff'erent reflections; pile erect, black ; margin of the scutellum with 

 a row of long hairs. Legs yellow, with black hairs; femora, excei)t 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 



TRANS. AM. ENT. SOC, XXVIII. AUGUST, 1902. 



