202 JOHN B. SMITH. 



14S, 149, Cemtomia; Lint. * Pr. E. S. Phil. i. 286, life history; id. iii. 664, 

 pupa; G. & R., Pr. Eut. Soc. Phil. v. 164, pr. syn.; Andrews,* Can. Ent. viii. 

 40; Bd.,* Sp. Gen. Lep. Het. i. 53, pr. syn. ; Hageu, Pap. iii. 61. 



Pal])i, under side of head, and all the legs dark coflFee browu ; upper side of 

 the head, thorax and collar whitish, the head and collar more or less stained with 

 clay color and edged with browu. Upper side of thorax luteous, the patagise 

 edged with dark browu, and another Hue of dark brown follows the upper edge 

 of the white on the sides. The lateral thoracic tufts at the posterior part of the 

 thorax are marked with luteous, dark brown and white. The abdomen above 

 and beneath is clay colored, with a narrow black doi-sal line more or less inter- 

 rupted at the incisures, and two broader and less definite lateral brown lines. 

 Primaries with costa light brownish gray, and a stripe of luteous extends from 

 the base of the wing along the cell, widening outwardly to the apex. The cen- 

 tral part of the wing below the cell and between the inner and outer cross lines 

 is dark coffee brown. The discal spot is small and white, and there are several 

 heavy black dashes between the veins and parallel with them below the median 

 aud beyond the cell, forming an oblique series from apex to the base. A triple 

 dark browu line starts from the costa near the base aud runs very obliquely to- 

 wards the end of the cell, giving off one tooth in its course, then turning sharply 

 back, runs to the hinder margin near the base of the wing iu a somewhat wavy 

 course. This line is usually very indefinite, aud rarely distinct euough to be 

 traced for its entire extent. A similar triple line, more separated on the costa, 

 starts from the outer fourth and runs dowu as far as veiu 5 at nearly right an- 

 gles to the costa, thence obliquely aud parallel, to the hiuder margiu. This line 

 is several times angulated iu the first part of its course, then wavy to near the 

 hind UKirgin, where it forms a sharp outward angle. The outer one of the lines 

 is margined outwardly with grayish. This line is very indistinct through the 

 costal region, aud below this the outer line is much the most distinct. Second- 

 aries dull fusco-luteous, with a central fuscous baud, the margins only distinct, 

 forming rather two parallel lines with a dusky shade between and a broader in- 

 definite subtermiual band ; grayish near anal angle. Beneath pale, brownish 

 gray, lighter on the costal margins. Primaries with the transverse maculation 

 more faintly reproduced. Secondaries with three brown discal lines giving off 

 sharp angles on the veins. Expands 3 — 4.25 inches ; 75 — 106 mm. 



Hub. — Canada to Virginia ; westward to Missouri, Iowa. 



The species is not very variable, and is easily recognized. It has 

 a very distinctive appearance, given by its coloration rather than by 

 any structural feature, and the species has always been separated 

 from Sphinx, principally however, upon its larval history. This is 

 certainly aberrant for the family, and Walsh, many years ago, saw 

 in the resemblance of the larva to that of some of the Cendocamp- 

 iihe an affinity between the families. This affinity, which seems to 

 me really non-existent, for there is nothing in the imago to bear it 

 out, has been enlarged upon without being added to by ]\Ir. Grote, 

 who has evidently forgotten where he first got the idea since he never 

 credited it to its tirst pro[)Ounder. 



