PSILOPUS. 275 



Female. It resembles the male very much, still the pubescence 

 and bristles of the body are shorter, also the anterior margin of 

 the wing is not ciliated. The delicate, minute white hairs upon 

 the under side of the femora are hardly perceptible. Middle tibia? 

 with a much shorter, not diverging pubescence, but with a few 

 minute black bristles, which are not to be found in the < . Tarsi 

 somewhat shorter, otherwise of a similar structure, still the middle 

 tarsi only with a quite short, not diverging pubescence, and the 

 first joint of the hind tarsi fully as long as the four fojlowing 

 joints taken together. Tegulse sometimes rather yellowish. 



Hob. Middle States. (Osten-Sacken.) 



B. The two first joints of the antennse pale. 



A. Fore femora in both sexes, or at least in the male, without yellow thornlike 



bristles upon the under side. 



1. Abdomen not yellow at the basis. 



16. P. pallens WIED. and . Ex viridi cinereus, opacus, pro- 

 boscide, palpis, duobus primis autennarum articulis, ventre, coxis pedi- 

 busque flavis, coxis posterioribus fusco-maeulatis. 



. Tarsorum anticorum articulo quarto subdilatato, albido. 



9 . Infero femorum anticorum latere setis validis flavis armato. 



Greenish-gray, without lustre, halteres, palpi, the two first joints of the 

 antennse, the venter, the cox^e, and the feet yellow, the four posterior 

 cox33 spotted with brown. 



. The fourth joint of the fore tarsi slightly enlarged, whitish. 



9 . Under side of the fore femora bearing stout yellow bristles. Long, 

 corp. 0.230.26. Long. al. 0.220.24. 



STN. Psilopus pallens WIEDEMANN, Auss. Zweifl. II, 219, 11. 

 Psilopus albonotatus LOEW, Neue Beitr. V, 4. 

 Psilopus pallens LOEW, Neue Beitr. VIII, 97, 17. 



Male. Everywhere closely covered with a grayish or whitish- 

 gray dust, below which the metallic bluish-green ground shines 

 distinctly, although not strongly, through. Proboscis brown ; 

 palpi whitish-yellow. Face broad, without hairs, very closely 

 covered with white dust. The two first joints of the antennse 

 yellowish, the second beset with very short minute black bristles : 

 third autennal joint brown, rounded ; arista proportionally short. 

 Front with a close white, round the ocellar tubercle with brownish- 

 gray, dust, without hairs, the usual black bristles upon it of medium 



