2 9 2 Hominoxious A rthropods 



mm. Otherwise marked when the wings are unspotted, 

 n. Wings unspotted. 



o. Petiole of the first forked cell (R 2 ) more than a 

 third the length of the cell. Mississippi 



valley A. walked 



oo. Petiole of the first forked cell a third the 



length of the cell. Md A. barberi 



nn. Wings spotted. 



o. Front margin of the wings with a patch of 

 whitish and yellow scales at a point about 

 two-thirds or three-fourths of the way from 

 base to apex of wing. 



p. Veins of the wing with many broad obovate 

 outstanding scales; thorax with a black 

 dot near the middle of each side. W. I . 



A. grabhami* 



pp. The putstanding scales of the wings rather 



narrow, lanceolate. 



q. Scales of the last vein of the wings white, 

 those at each end black; R^+b black 

 scaled, the extreme apex white scaled. 

 Widely distributed north and south 



(fig. 131) A. punctipennis 



A dark variety from Pennsylvania has 



been named A. perplexens. 

 qq. Scales of the last vein of the wing white, 

 those at its apex black; R4+s white 

 scaled and with two patches of 

 black scales. South and the tropics. 

 A. franciscanus and pseudopunctipen- 

 nis* 

 oo. Front margin of the wings wholly black 



scaled. 



p. Last (anal) vein of the wings white scaled 



with three patches of black scales (fig. 



132) . New Jersey to Texas . . A. crucians* 



pp. Last vein of the wings wholly black 



scaled, 

 q. Widely distributed north and south 



(fig. 130), ( =maculipennis) 



A. quadrimaculatus* 



qq. Distributed from Rocky Mountains 



westward A. occidentalis 



kk. Scutellum distinctly trilobed. 



1. Cell R 2 less than half as long as its petiole; thorax 

 with metallic blue scales; median lobe of the 

 scutellum not tuberculate; few small species which 

 are not common . . . . Uranotaenia Arrib. 



