﻿NORTH AMERICAN SPHINGIDiE. 175 



what longer than the thorax, with a short hook and seta. Thorax well developed 

 anterior to the base of the fore wings, but rounded anteriorly, usually with 

 a slight double crest on the fore part of the dorsum. Abdomen slender and oblance- 

 olate, at least twice the length of the thorax. Legs long and slender, hind tibise.with 

 moderate spurs. The wings narrow and moderately long ; the length of the anterior 

 less than that of the body, and about three times longer than broad across the inner 

 angle, the tip acuminated, the hind border obliquely rounded, but wavy between the 

 nervules, the inner angle rounded and the inner margin moderately concave. Pos- 

 terior wings rather acute at the tip, with the hind margin entire. 



SPECIES. 



A. Hind wings reddish. 



J Abdomen not banded. 



74. Obscura. — Hoary ; hind wings margined with brown along anterior angle. 



78. (Enotrus. — Cinereous ; hind wings margined with blackish brown. 



JJ Abdomen banded. 

 73. Ello. — Gray; hind wings with a broad, marginal, blackish brown band. 



79. Caicus. — Cinereous ; hind wings red, with black marginal radii. 



AA. Hind wings luteous. 



75. Scyron. — Hoary cinereous ; hind wings broadly margined with black. 



76. Alope. — Brown ; hind wings broadly margined with brown. 



AAA. Hind wings brown. 



77. Guttularis. — Hoary; hind wings ferruginous at base. 



73. A. Ello. Merian Ins. Surin. pi. 61, f. 2. Sphinx Ello Linn. Syst. Nat. 800, 13 ; 



Mus. Lud. Ulr. 351. Drury, I. 58, pi. 27, f. 3 ; Cramer IV. 24, pi. 301, f. D. ; Fabr. Sp. Ins. II. 143, 

 17 ; Mant. Ins. II. 94, 20 ; Ent. Syst. III. 1, 362, 21 ; Gmel. Syst. Nat. I. 5, 2375, 13 ; Harris, 

 p. 297, 11. Erinnys Ello Hubner, Verz. Schmett. 139, 1489. Anceryx Ello Walker, p. 224. 



Head smooth, thorax scarcely crested. 



Head and thorax gray ; the front of thorax and the vertex discolored with blackish, without distinct 

 markings, with a black line on sides of thorax extending from the eyes to the base of anterior wings. 

 Abdomen gray, with a dorsal gray band, containing a slender blackish line, and banded with alternate 

 black and gray bands in both sexes. Anterior wings pale grayish, varied with blackish ; with a blackish 

 stripe extending irregularly from the base to the tip, and consisting chiefly of streaks between the nervules ; 

 base of the wing blackish, with a patch in costa over disc, and at the origin of subcosto-inferior nervule, 

 and with a row of marginal black spots in the interspaces. Posterior wings rust red, with a broad, blackish 

 brown, terminal band and a cinereous patch at the anterior angle. 



The anterior wings of the specimens described are unfortunately worn. 



From the Smithsonian Institution. Capt. Pope's Collection. 



Egg.' ? 



Young La.rva. ? 



