AMERICAN HYMENOPTERA. 101 



37. Pompilus bipartitus. 



Ponipilus bipartitus, St. Farg., Hym. iii, p. 439, 5' 



Hah.—'' Philadelphia." Not identified. 



This is described as being black, with the abdomen f /j;'<Vfl^y testaceo- 

 ferruginous; wings uniformly fuscous and violaceous; prothorax short 

 and arcuate behind; metathorax long, convex, with a deep, longitudi- 

 nal, dorsal channel. Size not given. 



38. Pompilus algidus. 



Pompilus algidus, Smith, Brit. Mus. Oat. Hym. iii, p. 158, %. 

 Female. — Black, covered with a purple iridescent pile, in one speci- 

 men the sides of the face, apical margin of the clypeus, labrum, base 

 of the antennae beneath, angles of the prothorax, tegulre and anterior 

 legs, are obscurely tinged with ferruginous ; anterior margin of the 

 clypeus sinuate; posterior margin of the prothorax angular or subau- 

 gular; metathorax abruptly truncate behind; wings dark fuscous, with 

 a brilliant violet or purple iridescence, second submarginal cell about 

 twice longer than broad, the third narrowed one-half towards the mar- 

 ginal ; legs strongly spinose, the anterior tarsi strongly ciliated exteri- 

 orly; abdomen subdepressed, in one specimen covered with a rich pur- 

 ple iridescent pile, the second segment with a rather narrow, obscure 

 ferruginous band at base, and the third with a much broader one, 

 emarginate behind; in certain lights, these bands are more distinct, 

 and assume a golden hue ; in the other specimen the abdomen is of a 

 deep bluish-black color, somewhat shining, with a broad, orange-yellow 

 band across the base of the third segment, deeply emarginate behind. 

 Length 11 lines. 



Male. — In this sex the variation in color is very great, the body va- 

 rying from brown-black to almost entirely ferruginous; the antennae 

 are thickened and crenulate beneath; the abdomen is flattened above, 

 with the band on the third segment always the most distinct, and even 

 this is sometimes reduced to a mere line ; in the darkest specimen the 

 band on the third segment is broad and very distinct, and on each side 

 of the second segment, near the base, there is a reddish dot; in an- 

 other specimen the whole body is covered with a dense, silvery-serice- 

 ous pile, very brilliant, and so dense on the abdomen as to almost hide 

 the markings. Length 7 — 8 lines. 



Ilab. — West Virginia, Georgia, (Coll. Am. Ent. Soc.) 

 Two $ , six % specimens. A very handsome species, and so vari- 

 able that not two of the eight specimens are colored alike. 



