AMERICAN JJIPTERA. 249 



Thorax black, shining, with long or short, rather dense to moderate, white to 

 black, or mixed white and black hair. Pleurae glabrous. Scutellum with two 

 bristles. 



Abdomen black, shining, except the hypopygium and the last two segments of 

 the female, with sparse or bushy whitish hairs, denser on the sides of the seg- 

 ments basally. Hypopygium with denser and shorter hairs, small ; the valves 

 vary in length, the ventral process may be minute or in the lengthened hypo- 

 pygium elongate. 



Legs wholly black, except the pulvilli, or more or less yellowish, with bristle- 

 like and ordinary, whitish to dusky hairs. Hind femora piceous to shining 

 black, variable in length and thickness, black-spinose below. Front and middle 

 legs slender. Hind tibiae bowed, without bristles, piceous to black. Front and 

 middle tibise piceous to black, with bristles. Knees sometimes yellowish. Meta- 

 tarsi often yellow. Tarsi variable in amount of yellow color, always dark at 

 the tip, with several long, slender bristles, except on the hind pair. 



Wings almost clear hyaline to brown, except the apical third or less. Stigmal 

 spot brown or absent. Halteres fuscous. 2.5-5 mm. 



This description of an insect which may well share with the bee- 

 tle Nodonta {Colaspis) tristis, the distinction of being the most pro- 

 tean of insects, is drawn from an examination of over a hundred 

 specimens. These flies were collected throughout the eastern half 

 of North America. The localities represented are Massachusetts, 

 Pennsylvania, Maryland, North Carolina, Georgia, Alabama, Ohio, 

 Ontario, Michigan, Indiana, Illinois, Wisconsin, Colorado, Texas, 

 Vera Cruz, Tabasco and Yucatan. 



Hybos sequens nom. nov. 

 Hybos dimidiata Bellardi, Mem. della Reale Acad, delle Scienze di Torino, Ser. ii, 

 vol. xxi, p. 197. 

 Female. — Brownish black. Head moderate; antennae black; proboscis yel- 

 low; occiput black. Thorax strongly convex, brownish black, with dense and 

 short fuscous tomentum ; humeri pale; pleurae and pectus pale fuscous; scutel- 

 lum brownish black, concolorous with the thorax ; halteres pale at the base, sub- 

 fuscous apically. Abdomen brownish black, side margins pale ; venter black, 

 pale at the sides; ovipositor long, acute, black. Legs honey-yellow, with black 

 spines ; posterior femora much thickened, long. Wings strongly fuscous at base, 

 apically subhyaline; first posterior cell much narrowed at the margin of the 

 wing; stigma elongate, fuscous, 5 ram. 



Mexico (Salle). 



Among the Erapidse to be worked over for the Biologia Centrali 

 Americana of Messrs. Godman and Salvin wei'e two species, both 

 undescribed, taken in Chapada, Brazil. One of these, the subject 

 of this note, is a peculiar Hybotine, which can not be classed with 

 any of the known genera. This fly, though clearly belonging to 



TRANS. AM. ENT. SOC, XXVIII. (32) AUGUST, 1902. 



