182 Journal New York Entomological Society. [Voi.xm. 



6. Abdomen more or less pollinose or pale pubescent (7). 

 6. Abdomen entirely destitute of pollen or pale pubescence (14). 

 7. Pleura with a cluster of black hairs above center (8). 



7. Pleura without a cluster of black hairs above the center, though sometimes 

 with bare black spots (12). 

 8. Face and cheeks densely gray pollinose, each side of face marked with four pol- 

 ished streaks ( Mexico) histrio Coquillet. 



S. Face white pollinose with a black spot on lower margin of eye and another midway 



between it and the mouth (9). 

 8. Face not marked as above ( 11). 



9. Front above antennae on each side with three silvery pollinose spots arranged 

 in a triangle, the two outer ones contiguous to the orbit (Fla. , So. Car., 



Pa., Kv., N. J., Mass., Minn., Nova Scotia) buccata (Fabricius). 



9. Front above antennae with the two lower spots coalesced into a transverse line 

 extending from the orbit almost to base of antenna; (10). 

 10. Second abdominal segment with a basal tuft of white hairs on each side (Wyo.) 



albifrons Swenk. 



IO. Second abdominal segment without such a tuft ( N. M. ) lepusculi Townsend 



11. Abdomen with three basal segments partly brown pollinose laterally, leaving 



bare spots, elsewhere steel-blue (Col., Wyo., N. M. )..lepivora Coquillet. 



11. Abdomen with the fourth segment pollinose laterally (Ca., Ariz., N. M., 



Mexico) americana (Fabricius). 



12. Abdomen reddish brown, three last segments partly poliinose, with exposed 



spots (Cal.) latifrons Coquillet. 



12. Abdomen shining blue-black, only two last segments ever pollinose (13). 



13. Two last segments pollinose, with distinct bare spots (111., N. Y., Nova 



Scotia, Mexico) (= emasculator Fitch) fontinella Clark. 



13. Penultimate segment with basal half whitish pubescent and with a few bare 



spots (Minn. ) sterilator Lugger. 



13. Penultimate segment, except apical margin, uniformly white pollinose and 

 with long white hairs and no exposed spots, elsewhere entirely steel-blue 



(Nebr. ) fasciata Swenk. 



14. Pleura with a cluster of black hairs above the center (Cal., N. M. ) 



nitida Coquillet. 

 14. Pleura without a cluster of black hairs above the center (Wyo. ) 



polita Coquillet. 

 15. Abdomen entirely destitute of pollen (Cal., Ore., Col., Wyo., S. D. ) 



tenebrosa Coquillet. 

 15. Abdomen with the sides of the three basal segments white pollinose (16). 

 16. Last abdominal segment more or less pollinose (Mexico) ( = ferrtso/ia Walker) 



atrox Clark. 

 16. Last abdominal segment entirely steel-blue, not pollinose (N. M.) 



similis Johnson. 

 Cuterebra abdominalis, new species. ~ 



9. Yery close to C. horripilum. Head dull black, tinged with brown about 

 ocelli and on a large triangular elevated space on each side, clothed with short black 

 hairs which are much shorter and fewer on the brownish areas. A brownish pollinose 



