ART. 10 NORTH AMERICAN TACHINID FLIES WEBBER 25 



Thorax black, gray poUinose, bearing four dorsocentral and four 

 strong sternopleural bristles. Scutellum brownish with three pairs 

 of marginal bristles besides the decussate apical pair, also a discal 

 pair. 



Abdomen black, quite thickly gray pollinose as in archippivora 

 and bearing median marginal bristles on the first three segments, the 

 fourth bristly on its apical half. 



Mid tibiae with one large and one small bristle above it on outer 

 front side near middle. Hind tibiae evenly ciliate with one longer 

 bristle. Front pulvilli of male less than length of last tarsal joint. 



Wing venation normal, base of third vein with two or three 

 bristles ; costal spine small but distinct in the type specimen. 



Genitalia apparently as in archippivora. 



Length, 10 mm. 



Described from one male from Alameda County, Calif.; labeled: 

 " Feb. 45 oy 



Type.— Male. Cat. No. 43053, U.S.N.M. 



11. ACHAETONEURA TESTACEA, new species 



Frontina violenta Coquillett, Revision of N. A. Tachinidae, p. 108, 1897 (not 

 Walker List of Dipterous Insects, part 4, p. 788, 1849). 



Front of male at narrowest part (a point half way between vertex 

 and base of antennae) 0.24 the head width, in female the front at 

 narrowest point (vertex) 0.30 the head width; facial ridges bristly 

 from one-third to one-half way to antennae. Front and face cinere- 

 ous, the former with slight golden tinge ; antennae black, third joint 

 in male three and one-half to four, and in female from three to 

 three and one-half times the second ; bucca about one-fifth eye height. 



Thorax black, gray pollinose ; chaetotaxy as in frenchii; scutellum 

 with three pairs of strong marginal bristles besides a pair of cruciate 

 apical ones. 



Abdomen stout, yellow or brownish in color with a poorly defined, 

 wide, black dorsal vitta which extends over the larger part of 

 dorsum, in female the anal segment mostly gray pollinose; first 

 segment without marginal bristles ; second segment with one pair of 

 strong median marginal bristles; third with a marginal row of 

 strong bristles which are longer than those of the fourth segment; 

 fourth segment bristly on apical two-thirds, the bristles of unequal 

 strength, those at apex being strongest. 



Legs brownish. Mid tibiae with one long bristle on outer front 

 side near middle ; hind tibiae ciliate with one longer bristle. Front 

 pulvilli of male longer than last tarsal joint. 



Wing venation normal. 



Length, 7-8 mm. 



