NORTH AMERICAN LEPIDOPTERA. 189 



Dr. Boisduval's specimen was found sitting on the bark of a Red 

 wood tree — Sequoia sempervirens. 



S. dollii Neum., Pap. i, 149, Hyloicus ; Grt., New List 11, Sphinx. 



Head light gray, with two black spots near antennfe. Autenna; brownish, with 

 light gray pectinations. Collar light gray ; thorax and patagise whitish gray, 

 with two broad dark gray stripes along tegulse accentuated with black at their 

 commencement at collar. Primaries light gray, shading off into whitish towards 

 base; costal edge darker gray. Fringes whitish, with darker gray spots alter- 

 nately at the intersection of the veins. A blackish dash from apex pointing 

 diagonally towards base and fading away in the discoidal veins. Two short 

 blackish dashes between first and second, and second and thii-d median veins, 

 parallel with the neuration. Secondaries uniform brownish gray with fringes 

 alternately dark gray and white. Beneath uniform cinereous with the blackish 

 trace of the apical diagonal dash of primaries. Abdomen pale gray, with a black 

 dorsal line, and black and white lateral intersections at segments. Expands 

 1^ inches ; 50 mm. 



Hab. — Prescott, Arizona. 



Nothing is known of the early stages of this species. 



S. coloradiis Smith, Ent. Am. iii, 153. 



Fuscous or ashen gray, dorsum of thorax a little darker. A broad deep brown 

 band from base of antenniB, forming thence a broad margin to the patagiae ; this 

 band narrowly margined with white on either side. Metathoracic tufts also, 

 blackish. Abdomen with dorsum fuscous or brownish gray with a doi'sal line. 

 A broad lateral black band interrupted by having the segments narrowlj' white 

 margined. Beneath dull ashen gray. Primaries with a whitish shade through 

 the centre of wing fi-om base to apex, this shade inferiorly margined by a deeper, 

 more brownish gray. Through this darker shade is a series of short, interspaceal 

 black marks, the apical oblique dash formed of three of these dashes joined by 

 the dark shading. Parallel with and near to the outer margin is a somewhat 

 sinuate black line, with a paler gray shading on either side ; the line reaching 

 neither the inner margin nor the apex. Fringes pale, cut with darker gray. 

 Secondaries brownish gray immaculate; fringes pale, cut with darker gray. Be- 

 neath, uniformly brownish gray, with the apical dash faintly reproduced. Ex- 

 pands 2.12 inches; 28 mm. 



Hab. — Colorado. 



A single male specimen in Mr. Graef's collection. The species is 

 well marked, and the only one in the group with immaculate second- 

 aries, which has a paler longitudinal shade, which, with its darker 

 inferior marking, is characteristic of the species. The palpi are 

 small ; fore and middle tibiae spinose ; first joint of fore tarsi armed 

 with longer spines outwardly. The spurs are short and weak. 



S. elsa Strk., Lep. Ehop. et Het. 126, pi. xiv, figs. 4 and 5, Sphinx. 



Head and thorax white, with black powderings, more dense on disc, which 

 thus appears gray. The patagige margined with black, and dull orange yellow. 

 Metathoracic tufts black, as is the basal segment of abdomen. The latter is 



