88 E. T. CRESSON. 



The males of this species vary much in size (6 — 9 lines long), and 

 diflPer from the females by being smaller, by the more slender form, by 

 the anterior margin of the clypeus not being emarginate, and by the 

 less spinose legs. 



3. Pompilus maurus, n. sp. 



Female. — Deep black, sometimes with a purplish tint, smooth and 

 shining; head much compressed transversely; clypeus smaller than 

 usual, the anterior margin arcuate, the sides angular; prothorax larger 

 than usual, prominent, convex, the posterior margin angular; nietii- 

 thora's; rounded above, abrupt on the sides and behind, the latter some- 

 what emarginate ; wings dark fuscous, with a violaceous or purplish 

 reflection, the marginal eel! short, subtriangular, rather narrow, second 

 submarginal cell obliquely quadrate, much larger than the third, which 

 is triangular, being narrowed to a point towards the marginal ; legs 

 velvety black, subsericeous, the tibije and tarsi with rather numerous, 

 long, slender spines, the tarsal claws cleft, as in the male ; abdomen 

 oblong-ovate, convex above at base, more or less compressed at tip, 

 which is slightly pilose. Length 6} — 9 lines. 



Male. — Smaller and narrower than the female, and has the antennae 

 crenulated beneath. Length 6? lines. 



Hah. — West Virginia, Georgia, (Coll. Am. Ent. Soc.) ; Florida, 

 (Coll. Mr. E. Norton). 



Eight 9 , two S specimens. This species is remarkable for the 

 compressed head and abdomen, and by the tarsal claws of the female 

 being cleft as in the male. In most species of Pompilus the claws of 

 the female are toothed beneath at base, while those of the male are 

 cleft. 



4. Pompilus scelestus. 



FompiluH scelestus, Cresson, Proc. Ent. Soc. Phil, iv, p. 461, 9 %• 

 H,(b.— Conn., N. J., Col. Terr., (Coll. Am. Ent. Soc, and Mr. E. 



Norton). 



Ten 9 , three % specimens. The % is remarkable for having tlie 



tarsal claws not cleft, but toothed beneath near the base, as in the 



female. 



5. Pompilus luctuosus. 



Pompilus luctuosus, Cresson. Proo. Ent. Soc. Pliil. iv, ji. 4.')2, 9- 

 ILib. — Hudson's Bay Terr., 3Iaine, Illinois, Colorado and Dakota 



Territories, (Coll. Am. Ent. Soc, and Mr. E. Norton). 



Nine 9 .one % , specimens. Allied to scelestm, but is smaller, more 



shining, wings paler, and the legs less spinose. The posterior margin 



