HYMENOPTERASPHEGIDAE. AMMOPHILA PRUINOSA. 713 



46. POMPILUS ATROX. 



Pompihis atrox, DAHLB., CRESS., Trans. Am. But. Soc., i, 98. 

 1 9 specimen; Arizona; Henry Johnson. 



47. POMPILUS MARGINATUS. 



Pompilits marginatus, SAY, Long's 2d Exped., ii, 333. 



1 9 specimen; New Mexico; Dr. H. C. Yarrow. 



48. PRIOONEMIS TEXANUS. 

 Priocnemis texamts, CRESS., Trans. Am. Ent. Soc., iv, 204. 



1 9 specimen; New Mexico; Dr. H. C. Yarrow. 



49. PRIOCNEMIS TERMINATES. 



Pompilus tcrminatus, SAY, Am. Ent., pi. 42. 



1 9 specimen; Arizona; H. W. Henshaw. 



50. PEPSIS CAERULEA. 

 Spltex ccerulea, LINN., Syst. Nat., i, 497. 

 Pompilus formosus, SAY, Am. Ent., pi. 42. 



Numerous t? 9 specimens; Eastern Nevada ; 1872; Dr. H. C. Yarrow: 



Arizona; Jas. M. Rutter. 



51. PEPSIS ORNATA. 



Pepsis ornata, ST. FARG., Hym., iii, 486. 



10 $ 9 specimens; Eastern Nevada; 1872: Colorado, New Mexico; 

 Dr. H. C. Yarrow : Arizona; Jas. M. Rutter. 



52. AMMOPHILA YARROWI, sp. nov. 



i . Black ; head and thorax covered with a rather long, dense, silvery- 

 cinereous pubescence; metathorax with an elongate, black, transversely 

 aciculated space on each side of disk; tegulse fulvous, black anteriorly; 

 wings hyaline, slightly dusky at tip; legs black, covered with very fine 

 sericeous cinereous scales; tibiae sometimes varied with ferruginous; abdo- 

 men: the petiole long and very slender, the second joint except upper edge, 

 and the first, second, and sides of third segments, ferruginous. Length, 11 

 lines. 



2 <? specimens; Pueblo, Colorado; collected by Dr. H. C. Yarrow. 



53. AMMOPHILA PRUINOSA. 

 Ammopliila pruinosa, CRESS., Proc. Ent. Soc. Phila., iv, 455. 



15 <? 9 specimens; Eastern Nevada; 1872: New Mexico, Colorado; 

 Dr. H. C. Yarrow. 



