216 JOHN B. SMITH. 



also Inroad and flattened and meets the hook at the inner side of tip. 

 The side 2:)ieces are very broad at tip, at the inferior angle with two 

 curved corneous hooks. A narrow, elevated, corneous ridge runs 

 close to but not entirely parallel with outer margin ; inside of this is 

 a broader ridge with flattened top, which is i-ough with elevated 

 points and teeth. The American species is of large size and easily 

 recognized. 



T. niodesia Harr.. Sill. Jouro. 36, 29-2, 1839, Smerinthns ; Ag., Lake Sup. 388, 

 pi. 7, fig. 7, 1850, Smerinthus; Clem., Journ. Ac. N. Sci. Ph. iv. 1859, 183, 

 SmerintliMS ; Moi-r., Syu. 1862, 210, Smerinthus ; G. & E., Pr. E. S. Ph. v. 161- 

 185, 1865, Smerinthus ; List. Lep. N. A. i, p. iv. 1868, Smerinthus; Grt., Buflf. 

 Bull, i, 24, Laothce ; id. ii, 227, Amorpha ; Strk., Lep. Ehop. et Het. 60, pi. vii 

 fig. 11, %, Smerinthus; Butl., Tr. Zool. Soc. Lond. ix. 589, Triptogon ; Grt., 

 Can Ent. ix. 132, Triptogon: Bunker, Can. Ent. i.x. 210, Smerinthus; Edw., 

 Pr. Cal. Ac. Sci. vi. 92, Smeriuthns ; Fernald, Sph.N. E. 71, Triptogon. 



princeps Wlk., C. B. M. Lep. Het. viii, 2.55, Smerinthus ; G. & E., Tr. A. E. S. 

 ii. 76, pr. syn. 



populicola Bd., Sp. Geu. Het. i, 22, Smerinthus. 



Var. occidentalis Hy. Edw., Pr. Cal. Ac. Sci. vi. 92, Smerinthus ; Strk., Lep. 

 Ehop. et Het. 126; Grt., Buff. Bull, iii, 223; New List, 1882, an sp. dist. ; 

 Holland, Can. Ent. xviii. 105, var. pr. 



imperator Strk., Lep. Ehop. et Het. 125, pi. xiv. fig. 3, Smerinthus ; Grt , Lists 

 pr. syn. 



Head, thorax and abdomen ]iale gray or olivaceous, darker beneath, segments 

 of abdomen paler marked or ringed. Basal third of primaries pale gray, with 

 faint transverse shades. A broad, olive median band, the interior margin strongly 

 defined, upright, slightly sinuate and dentate ; the outer margin marked by a 

 wavy, pale line. Outer part of wing olivaceous, somewhat j)aler than the me- 

 dian band, crossed by three lighter shade bands. Secondaries deep rosy red on 

 the disc, pale gray on the costal and hinder margins, and olivaceous on the outer 

 margin. A bluish gray patch near anal angle, with a l)lack streak above it. and 

 a pale fawn gray shade above that. Beneath olivaceous, with a broad dusky 

 outer margin and a variable number of obscurely marked sliade Hues. Disc of 

 primaries toward base clothed with longer, dense, rosy red hair. Expands 3.5 — 

 5.5 inches; 88 — 138 mm. 



Hub. — Canada to I^ouisiana ; westward to California. 



A widely distributed but not very common species, and the largest 

 American Smerinthid. The soft blending of olive and gray shades 

 gives this species a beauty of its own, well expressed by its name. 

 It varies in depth of ground color, and in the distinctness of the 

 transverse maculation. Somewhat also in the form of the inner 

 margin of the median band which is sometimes strongly indented. 

 The pale form of the species has been named occidentalis by Mr. 



