HYMENOPTERA— SPHEGIDAE.— AMMOPHILA PRUINOSA. 713 



46. POMPILUS ATPOX. 

 Pompilus atrox, Dahlb., Cress., Trans. Am. Ent. Soc, i, 98. 

 1 9 specimen; Arizona; Henry Johnson. 



47. POMPILUS MARGINATUM. 

 Pompilus marginatus, Say, Long's 2d Exped., ii, 333. 



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



* 48. PEIOCNEMIS TEXANUS. 

 Priocnemis texanus, Cress., Trans. Am. Ent. Soc, iv, 204. 

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



40. PRIOCNEMIS TERMINATUS. 

 Pompilus terminatus, Say, Am. Ent., pi. 42. 



1 9 specimen; Arizona; H. \Y. Henshaw. 



50. PEPSIS CAERULEA. 



Sphex ccerulea, Linn., Syst. Nat., i, 407. 

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



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



Arizona ; Jas. M. Riitter. 



51. PEPSIS ORNATA. 



Pepsis ornata, St. Farg., Hym., iii, 480. 



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



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



52. AMMOPHILA YARROWI, sp. nov. 

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

 cinereous pubescence; metathorax with an elongate, black, transversely 

 acieulated space on each side of disk: tegulae fulvous, black anteriorly; 

 wings hyaline, slightly dusky at tip: legs black, covered with very line 

 sericeous cinereous scales: tibia? 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. 

 Ammojihila pruinosa, Cress., Proc. Ent. Soc. Phila., iv, 455. 



15 c? 9 specimens; Eastern Nevada; 1872; New Mexico. Colorado; 

 Dr. H. C. Yarrow. 



