1865.] 127 



prothorax large, rounded in front, with a black stain on the anterior 

 margin ; mesothorax smaller than the prothorax ; pleura and metatho- 

 rax covered with a dense fine cinereous pile, the latter abrupt on the 

 sides and behind ; tegulae pale ferruginous. Wings whitish-hyaline, 

 the anterior pair with a large, broad fuliginous spot or band beyond 

 the middle, also a small baud on the transverso-medial nervure, and 

 the extreme base, of the same color ; posterior wings hyaline, slightly 

 dusky at tips ; nervures blackish, the stigma distinct. Legs piceous- 

 black, covered with a very dense cinereous pile ; the four posterior 

 tibiae with a few short scattered spines, tbe tarsi slightly spinose ; the 

 inner spur of the posterior tibiae ciliated near the base. Abdomen 

 elongate, sessile, convex, pointed at tip ; basal segment, except the dor- 

 sal middle, a small spot on each side at the base of the second segment, 

 extreme sides of the third, the apical margin of the fourth, and the 

 whole of the remaining segments, as well as the venter, covered with a 

 dense, short, appressed. cinereous pile, somewhat sericeous; disk of the 

 first, the second, and the middle of the fourth segments, dark fuscous; 

 the third and the basal margin of the fourth segments, ferruginous. 

 Length 5 lines; expanse of wings 8 lines. 



Collection. — Dr. J. Gundlach. One specimen. 



Sec. -i. — Wings more or lets fuscous. 

 * Body ferruginous and black. 

 Pompilus compressiventris, n. sp. 



Long and narrow, ferruginous; antennae, sides of mesothorax, the whole of 

 the thorax beneath, and the legs, black: wings fuscous; abdomen elongate, 

 compressed beneath and at tip. 



Female. — -Head a little broader than the thorax, ferruginous, with 

 most of the occiput and cheeks, a stain on the front, and the mandibles 

 except tips, black; clypeus and labrum large, shining, the anterior 

 margin of the former slightly and obtusely emarginate; palpi pale ferru- 

 ginous; antennae longer than the head and thorax, slightly involute, 

 blackish-fuscous. Thorax long and narrow, ferruginous above, black- 

 ish-fuscous on the sides and beneath ; sides of the mesothorax broadly 

 dark fuscous; metathorax long and compressed, ferruginous above, with 

 a slight longitudinal channel down the middle, the extreme apex ab- 

 rupt; tegulae dull ferruginous. Wings uniformly fuscous, with a strong 

 brassy reflection ; nervures fuscous ; third submarginal cell nearly one- 

 half longer than the second, truncate at tip and suddenly narrowed to- 

 wards the marginal. Legs entirely blackish-fuscous, long and stout, 

 the coxae large and robust; tibiae and tarsi very slightly spinose, the 



