172 Journal New York Entomological Society. ["*^'o'- xxiv, 



bristles of thorax stout and prominent, hinder two pairs of anterior dorsocen- 

 trals almost as strong as postsuturals ; acrostichals present ; three pairs pos- 

 terior dorsocentrals of about equal size; scutellar apicals present; lower sterno- 

 pleura with bristles only ; abdomen short, stout, its outline more elliptical than 

 oval; nota clothed dorsally and ventrally with short, reclinate bristles; ves- 

 titure of third plate erect ; second segment usually with two stouter marginals 

 at center ; genital segments completely filling cavity of fourth notum (see 

 figure) ; second segment discoidal, rounded, dull orange, first much larger and 

 completely pollinose or its posterior part dull orange. 



Female. — Vestiture of back of head black except for a narrow band of 

 yellow hair just above foramen and similarly colored hairs on a small portion 

 of the metacephalon just beneath ; cheeks clothed with black bristles and 

 bristle like hairs ; greater ocellars nearly as strong or sometimes stronger than 

 uppermost pair of frontals ; hairs covering anterior spiracles mostly grayish; 

 first and third veins prominently bristly ; costal spine short but distinct ; sec- 

 tion III of costa practically equal to section V ; bristles of thorax stout and 

 prominent; hinder two pairs of anterior dorsocentrals almost as strong as 

 postsuturals ; acrostichals present ; three pairs posterior dorsocentrals of about 

 equal size ; bristles of lower sternopleura in three distinct rows ; distinctly larger 

 and more erect bristles mixed with vestiture of lateral and ventral surfaces 

 of fourth notum ; second segment usually with two stouter marginals at center ; 

 genital segments dull orange, sixth notum not divided into lateral lips, seventh 

 similar in shape and visible just beneath it, but much smaller (almost vestigial). 



Length: s to ii mm., average 8 to lo mm. 



Male, Head. — Viewed from side parafrontals and genae with dark reflec- 

 tions. Breadth of front at its narrowest part varies from five-sevenths to 

 five-sixths eye width ; cheek height one third or slightly greater than one third 

 that of eye. Front prominent, sides of frontal vitta parallel anteriorly but its 

 margins effaced below ocellar triangle. Second antennal segment dark, some- 

 times brownish especially at tip; third about twice length of second; arista 

 shortly plumose on basal half. Back of head somewhat convex, its vestiture 

 black except for a narrow band of yellow hair just above foramen and simi- 

 larly colored hairs on a small portion of the metacephalon just beneath. 

 Cheeks clothed with black bristles and bristle-like hairs. Gena with a row of 

 minutes hairs near lower eye orbit and a few others that are scattered. Palpi 

 dark. 



Chaetotaxy. — Lateral verticals present; vibrissas inserted just above line of 

 oral margin ; greater ocellars nearly as strong, sometimes stronger than upper- 

 most pair of frontals. 



Thorax. — Metanotum clothed with short scattered reclinate bristles. Hairs 

 covering anterior spiracle dark basally, lighter toward tips ; those of anterior 

 margin of posterior spiracle dark brown ; those of spiracular cover only 

 brownish basally, mostly yellowish. Epaulets dark. 



Wings. — Bend of fourth vein varies from an acute to a right angle ; an- 

 terior cross-vein slightly more basal than end of first longitudinal ; first and 



