1865.] 191 



Genus EXOMALOPSIS. Spin. 

 Exomalopsis pulchella, n. sp. 



Black, polished, clothed with pale glittering pubescence ; sides of the first 

 segment of abdomen, an oblique line on each side of second, basal margins of 

 third and fourth and the whole of fifth segments, silvery-white; wings hyaline, 

 fuscous at tips; hind legs of 9 with a dense scopa of long pubescence, the basal 

 half pale, the apical half fuscous. 



Female. — Black, polished, strongly tinged with piceous; head feebly 

 punctured; the vertex, occiput, cheeks and labrum, clothed with rather 

 dense, pale, silky pubescence, that on the occiput and cheeks long; 

 sides of the face with a patch of silvery-white pubescence ; clypeus flat, 

 truncate in front; antennae piceous, the flagellum brown beneath. 

 Thorax rather densely clothed with pale ochraceous pubescence, sparse 

 and mixed with blackish on the disk of uiesothorax, long and dense on 

 the scutellum, and silvery-white on the pleura beneath ; tegulae rufo- 

 piceous. Wings hyaline, slightly iridescent, the apical margins pale 

 fuscous ; nervures and stigma pale fuscous. Legs piceous, paler at 

 base, clothed with silvery-white pubescence ; posterior tibife and basal 

 joint of tarsi with a dense scopa of long pubescence, that on the tibiae 

 whitish, tinged with ochraceous, silky, slightly mixed with fuscous at 

 base, that on the basal joint of the tarsi fuscous, mixed with whitish 

 beneath. Abdomen short, subglobose, smooth and polisbed ; base and 

 sides of the first segment, an oblique line on each side of the second, 

 a narrow fascia at the base of the third and fourth, slightly interrupted 

 or attenuated on the middle, and the whole of the fifth segment, clothed 

 with a dense silvery-white pubescence, most obvious in certain lights ; 

 beneath rather densely clothed with short, pale glittering pubescence. 

 Length 3.1 lines; expanse of wings GJ lines. 



Male. — Resembles the female, but not so robust, the pubescence more 

 glittering, the face and clypeus densely clothed with silvery-white pu- 

 bescence ; the pubescence of the hind legs is colored as in the female, 

 but not half so long; the abdomen is not so broad, more pointed at tip, 

 and not so smooth ; the fasciae on the third and three following seg- 

 ments are distinct, while the oblique line on each side of the second 

 segment is obsolete; venter naked, sericeous. Length 3 lines; expanse 

 of wings 6 lines. 



Collect ion.--Ent. Soc. Philad. Three ? , one S , specimens. 



Exomalopsis similis, n. sp. 



Piceous, clothed with pale ochraceous pubescence ; sides of the face, pleura, 

 and markings of abdomen similar to E. pulchella, whitish ; wings hyaline, tinged 

 with pale fuscous at tips; scopa of hind legs entirely pale ochraceous. 



Female. — Piceous, more or less tinged with brownish; head and 



