

NO. 1988. TEE DIPTEROUS FAMILY PEORID.^—MALLOCH. 519 



when the frons is much broader than long the first row of bristles is 

 transverse or almost so, and when the frons is longer than broad the 

 center pair of bristles in this row is much below the outer pair, in 

 many cases directly or almost directly below the outer pair. This 

 is noticeably so in the species above cited, but there are among 

 the other species in Apliiochseta all the possible variations between 

 these two extremes, so that it would be impossible to place some 

 species in either PJialacrotopliora or ApJiiochxta if the situation of 

 these bristles is to be taken as the line of demarcation between the 

 genera. I am not in a position to say definitely whether Enderlein 

 had a species which is entitled to rank as of a distinct genus from 

 Apliiochseta because of his rather unsatisfactory description, but if 

 hruesiana agi'ees with epeirae, in the bristling of the frons then I should 

 be inclined to consider it as an Apliiochseta. The characters I have 

 used for the separation of the groups in this paper are much more 

 reliable and at least to my mind more satisfactory than the single 

 one cited by Enderlein. for Phalacrotophora. 



PULICIPHORA VIRGINIENSIS. new species. 



Male. — Brownish yellow, subshining; frons opaque brown, about 

 one-fourth broader than long, four weak, subequal post-antennal 

 bristles present, the lower pair low do'wn between the antennae and 

 separated by almost as wide a space as the upper pair, center pair in 

 first row almost in transverse Ime with the upper post-antennals and 

 nearer to center of frons than outer pair in same row, which are 

 much higher placed on frons; besides the normal bristles there are 

 numerous short hairs on the surface, antennae yellowish, third joint 

 large, slightly pointed, arista almost apical, distinctly pubescent, 

 pale, slightly longer than breadth of frons, palpi pale, rather spatu- 

 late, with 3-4 long, slonder bristles on lower surface; mesonotum 

 with two long bristles in front of scutellum, pleurae yellowish, scu- 

 tellum with two long posterior bristles and two very weak anterior 

 hairs; abdomen opaque brown with a few weak lateral hau's, hypo- 

 pygium protruding, j^ellowish, shining, organ on right side produced 

 into an acute point, anal protuberance small, yellowish, with a few 

 surface hairs; legs and coxae almost entirely yellow, only the tarsi 

 darkened, mid tibial spur minute, hind tibial spur large and distinct ; 

 wangs grayish, costa to about three-fifths the wing length, distinctly 

 thickened on middle, first division two-thii'ds as long as second, fringe 

 very short, fourth vein straight, separated from third vein by a clear 

 tenth of its length, parallel with fifth and ending at very near to 

 wing tip; halteres dark bro\vn. 



Length, 0.75 mm. 



Type.— C&t. No. 15262, U.S.N.M. 



Locality. — Rossl5m, Virginia, September 22, 1912 (Knab and 

 Malloch). 



