AMERICAN HYMENOPTERA. 89 



of the prothorax is angular. The % is, as usual, narrower than the 9 , 

 and has the legs almost destitute of spines ; the tarsal claws are cleft. 



6. Pompilus tenebrosus. 



Fomjnhis tenebrosus, Cresson, Proc. Ent. Soc. Phil, iv, p. 453, 9- 

 Hab. — Colorado Territory, (Coll. Am. Eat. Soc); Maine, (Coll. 

 Mr. E. Norton). 



Six 9 specimens. Much like luctuosus, but is easily recognized by 

 the petiolated third submarginal cell of the anterior wings. The pos- 

 terior margin of the prothorax is arcuate. 



7. Pompilus angustatus. 



Pomjiilus angustatus, Cresson, Proc. Ent. Soc. fhil. iv, p. 452, % 9 • 



Ildb. — Colorado Territory, (Coll. Am. Ent. Soc). 



Two 9 , one % , specimens. Resembles scclestus in color, but tlie 

 form is much narrower and more slender, the wings are longer and the 

 posterior margin of the prothorax is arcuate. 



8. Pompilus ingenuus, n. sp. 



Female. — Body narrow, velvety black, with a brilliant purple or 

 bluish-purple reflection over the entire body, legs and wings ; clypeus 

 short and broad, the anterior margin broadly truncate ; antennae short, 

 black above, sericeous-brown beneath ; prothorax moderately short, the 

 posterior margin arcuate ; metathorax convex above, abrupt and exca- 

 vated behind, sometimes with a well-impressed, longitudinal, central 

 line; wings fuliginous, much darker on the apical margins, the viola- 

 ceous reflection brilliant, the second submarginal cell subquadrate, 

 smaller than the third, which is nearly triangular, being much nar- 

 rowed towards the marginal ; tarsi strongly spinose, the tibiae sparsely 

 so, anterior tarsi strongly ciliated ; abdomen elongate, narrow, convex 

 above, subcompressed at tip, which is slightly pilose. Length 7 — 7] 

 lines. 



Male. — Differs from the female only by the slightly narrower form, 

 by the metathorax being more deeply excavated behind, by the more 

 ample wings, and by the less spinose legs. ]jength 62 lines. 



Hah. — West Virginia, Illinois, Dakota Territory, (Coll. Am. Ent. 

 Soc.) 



Two 9 ) three % specimens. A very pretty species, distinguished 

 from sethmps \>y its beautiful violet color, narrower form and shorter 

 antennae. 



TRANS. AMER. ENT. SOC. (12) JUNE, 1867. 



