93 



B. Primaries not reticulate; 



a. Primaries so heavily powdered with black scales as to 

 appear gray, the only contrast being black veins ; no 



brown tinge stahilis 



h. Primaries appearing pale to dark, gray to brown, more 

 or less contrasty; with some brown tinge, often obso- 

 lescent ; 



a'^. Shade between veins 2 and 3 of the primary not 

 more conspicuous and contrasting than the dark 

 discocellular and median vein, 

 a^. Pale appearing, except for the dark veins, 



brown shading usually obvious bertholdi 



h^. Darker; primaries heavily suflFused with 

 brownish-black ; brownish tinge present but 



often obsolescent — bertholdi race fusca 



h^. Shade between veins 2 and 3 of the primary often 

 concentrated into a distinct rounded spot ; the 

 most conspicuous shade present; except occasion- 

 ally some shading outwardly from the discocellu- 

 lar intrtisa 



c. Primaries appearing almost immaculately pale — 



bertholdi form edwardi 



III. Thorax clothed with hair; 



A. Primaries practically immaculate manfredi 



B. Primaries with brown shades henrici 



Prionoxystus robini^ Peck. 



1818, Peck, Mass. Agr. Rept. & Jour., V, 67, pi., Cossus; 

 1911, B. & McD., Contr. Nat. Hist. Lep. N. A., I, #1, 34, bibliography, pi. 

 VI, f. 9 ^, (f. 10 9 = mixtus race nov.), Prionoxystus. 



crepera Harris. 



1835, Harris, Cat. Ins. Mass., p. 72, Cossus. 

 plagiatus Wlk. 



1856, Wlk., Cat. Lep. Het. B. M, VII, 1515, Cossus. 

 race zabolicus Stkr. 



1898, Stkr., Lep. Rhop. Het., Sup., I, 5, Cossus. 

 ab. RETicuLATUS Lint. 



1878, Lint., 30th Rept. N. Y. State Mus., XXX, p. 242, Cossus; 



1911, B. & McD., Contr. Nat. Hist. Lep. N. A., I, #1, 34. pi. VII, f. 1 

 (type), robiniae ab., Prionoxystus. 



ab. QUERCUS Ehrm. 



1893, Ehrm., Can. Ent., XXV, 257, robini<B ab., Prionoxystus. 



