2g2 Hominoxious Arthropods 



mm. Otherwise marked when the wings are unspotted, 

 n. Wings unspotted. 

 o. Petiole of the first forked cell (R2) more than a 

 third the length of the , cell. Mississippi 



valley A. walkeri 



00. 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 outstanding scales of the wings rather 



narrow, lanceolate. 



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



those at each end black; R4-f6 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; R4-1-6 white 

 scaled and with two patches of 

 black scales. South and the tropics. 

 A. franciscanus and pseudopunctipen- 

 nis* 

 00. Front margin of the wings whoUy 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 whoUy 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 R2 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 Uranotasnia Arrib. 



