INSECUTOR INSCITI^ MENSTRUUS 187 



bristles at tip. Anterior tarsi strongly thickened, the meta- 

 tarsus as thick or barely thicker than the broad apical part of 

 the tibia, the latter densely hairy on is outer edge, but without 

 distinct bristles or setulae; setulae of hind tibia very small, 

 delicate and closely placed, their femora simple below. Costal 

 vein ending distinctly before the middle of the wing ; its bristles 

 short and closely placed ; its first section one and one-half times 

 as long as the second and third combined ; third two-thirds 

 as long as the second ; fork obtuse, curvature of fourth vein 

 slight ; its apex nearly straight and not recurved ; fifth and sixth 

 each slightly bisinuate ; seventh very weak, almost straight. 



Type from Riverton, New Jersey, June 18 (Johnson) ; one 

 paratype from Chicago, Illinois, June 6, 1903 (Melander), 

 and another from Falls Church, Virginia, July 4 (Banks). 



This species is most nearly related to two European species 

 described by Wood. From the first of these, A. hnmilis, it 

 differs in venation and in lacking the stubby hairs on the hind 

 femora as well as in the reduction of the lower post-antennal 

 bristles. From A. crassipes it differs greatly in venation, and 

 in the development of the lower post-antennal bristles, besides 

 being much larger. 



Aphicchasta pulla, new species. 



Male. Length 2.0 mm. Black, with a brown tinge to the 

 mesonotum ; pleurae brown, lighter below and anteriorly ; palpi 

 brownish yellow; legs dull, light yellow, darker on the tarsi; 

 halteres pale yellow, darkened at tips, anal process honey- 

 yellow ; wings distinctly tinged with brown ; venation fuscous, 

 the light veins very distinct. Front slightly shining, as long 

 as broad, its bristles large ; lower proclinate bristles three- 

 fourths as long as the upper and more closely placed ; upper 

 occupying nearly one-third the width of the front ; bristles of 

 lower reclinate row close together ; the outer one next the eye 

 and set but little above the inner one ; upper row but little 

 curved down medially, the inner bristles farther from one 

 another than from the lateral ones ; ocellar tubercle and medi- 

 an frontal groove well developed. Antennae moderate, arista 



