AMERICAN HYMENOPTERA. 90 



in his marginahis), to uniformly fuscous, and even to blackish-violace- 

 ous ; the third submarginal cell is generally more or less petiolated ; 

 and in some specimens triangular and not at all petiolated, ]^ength 3 

 — 6 lines. 



Male. — Narrow, cylindric ; head, thorax and legs covered with a 

 dense silvery-sericeous pile ; legs sparsely spinose ; wings hyaline, iri- 

 descent, with a broad, fuscous, apical margin ; abdomen narrow, sub- 

 depressed, with a broad reddish baud on the second segment. Length 

 4 J lines. 



Hah. — Massachusetts, Connecticut, New York, New Jersey, Penn- 

 sylvania, Delaware, Virginia, Illinois, Colorado and Dakota Territo- 

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



Thirty-eight 9 i one % , specimens. This is a common and a very 

 variable species, both in size and coloration. Some specimens mimic 

 small examples of trojncus so closely, that it is difficult to separate 

 them. 



I]3. Pompilus americanus. 



Pompihis americanus, Beauv., Ins. Afr. et Amer. p. 117, jil. 3, fig. 6. 



Smith, Brit. Mus. Cat. Hyra. iii, p. 157. 

 Pomjnlus trifasciatus, Beauv., Ins. Afr. et Amer. p. 118, pi. 3, fig. 6, (var.) 

 Pompilus filebejus, Dahlb., Hym. Eur. i, p. 60. 



Female. — Black; second and third, and sometimes the first, seg- 

 ments of the abdomen above with a reddish-yellow or orange-yellow 

 band, broader on the second segment, more or less emarginate behind, 

 and sometimes interrupted down the middle ; anterior margin of the 

 clypeus truncate, or subtruncate; posterior margin of the prothorax 

 angular : wings fuscous, or fusco-hyaline, sometimes with a darker api- 

 cal margin; third submarginal cell triangular; legs thinly spinose. 

 Length 5 2 — 71 lines. 



Male. — Resembles the females, but is narrower; the body has a 

 slight purplish hue ; the ftice silvery ; the legs less spinose ; the abdo- 

 men less convex, sericeous, the first segment with a slight reddish 

 stain, the second and third segments with an orange-yellow band, 

 broader and more distinct on the second segment. Length 6 lines. 



Bab. — Pennsylvania, Delaware, Maryland, Illinois, Florida, Louisi- 

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



Eighteen 9 , one % , specimens. This is a tolerably common spe- 

 cies, and the specimens before me vary but little in size and color. 



34. Pompilus ephippiger. 



Pompilus ephippiger, Smith, Brit. Mus. Cat. Hym. iii, p. 158, 9 . 

 ^^ Female. Length 6 — 82 lines. — Black; head thinly sprinkled with 



