NORTH AMERICAN LEPIDOPTERA. 183 



complete connection between these two groups of Sphinx, having the 

 thoracic macuhition of the one, the wing maculation of the other, 

 somewhat modified, however, in the direction of the first, while the 

 armature of the legs is like that of chersis. 



Unfortunately all the specimens of this species and vashti. at my 

 command are females, therefore I cannot give any idea of the genital 

 structure. The early stages are entirely unknown thus far. 



S. VHMliti Strk., Lep. Rhop. et Het. 136, pi. xv. fig. 4, %, Sphinx ; Grote, New 

 List 1882, = vancouverensis ; Holland, Can. Ent. xviii, 103, an sp. dist. 

 Ash Kfiiy, head and thorax more whitish. Palpi laterally brown. Vertex of 

 head slightly darker, as is also the prothorax. Patagise edged with black ; meta- 

 thoracic tufts also black, and a few irregular black lines at base of thorax. Ab- 

 domen with dorsum dark gray, with a distinct median black line. Laterally 

 there is a broad black band interrupted by a series of white demi-bands, which 

 do not always entirely cross the black shade. Beneath, dull gray ; venter with 

 a distinct black median line. Primaries ashen gray; a whitish shade from the 

 base through the costal region narrowing outwardly and a white submarginal 

 shade broader toward anal angle and not quite attaining the apex. Below the 

 pale shade toward base of wing is a darker smoky gray shade. The veins are 

 narrowly black marked, and there is a long, slender black line between veins 1 

 and 2, and another through the outer part of median cell, and thence close to 

 vein 5. Other short interspaceal dashes to apex, where two unite to form the 

 usual oblique apical streak, which is superiorly margined by white scales. In- 

 wardly marking the pale submargiual shade is a distinct oblique black streak, 

 within which is a parallel brown line. The fringes of both wings are evenly 

 gray. Secondaries whitish with a blackish, median, and subterminal band. Be- 

 neath, primaries ashy gray, with a transverse outer, oblique line, faintly repro- 

 ducing that of the upper side, a faint median baud and a reproduction of the 

 apical dash of upper side. Secondaries reproducing the maculation of the upper 

 side, but much more whitish. Expands 2.75 inches; 70 mm. 



Hab. — Arizona, Montana. 



The resemblance of this species to albescens Tepper, has been al- 

 ready noted. The structure is practically identical. No male of 

 this species was available for examination, and nothing is known of 

 the early stages. 



S. Iiboce«lrus Hy. Edw., Pap. i, 115. 



At first sight looking like a small example of S. oreodaplme, but differing 

 greatly when carefully examined. Color the same as that of t''. chersis, with the 

 same black dashes upon the primaries, that along the median nervule, which is 

 frequently wanting in oreodaphne, and sometimes in chersis. being here well de- 

 fined and reaching almost to the base of the wing. The ground color of the 

 secondaries is a clear white, and the median baud stands out in stronger contrast 

 than in either chersis or oreodaphne. while the gray dorsal space of the abdomen, 

 traversed by a black line, is narrower than in either of the other forms, and the 

 demi-bands coiiijiaratively larger and clearer white. In chersis And oreodaphne 



