NORTH AMERICAN LEPIDOPTERA. 189 



Dr. Boisduval's specimen was found sitting on the l)ark of a Red 

 wood tree — Sequoia sempervirens. 



S. <Iollii Neum., Pap. i, 149, Hyloicm ; Grt., New List 11, Sphinx. 



Head light gray, with two black spots uear anteonpe. Antennaj brownish, with 

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

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

 coninieiicement 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 iu the discoidal veins. Two short 

 blackish dashes between first and second, and second and third median veins, 

 parallel with the neuratiou. 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. Alxlomen pale gray, with a black 

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

 IJ inches : 50 mm. 



Hah. — Prescott, Arizona. 



Nothing is known of the early stages of this species. 



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



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

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

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

 blackish. Abdomen with doi'sum fuscous or brownish gray with a dorsal line. 

 A broad lateral black band interrupted by having the segments narrowly white 

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

 the centre of wing from 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 ou either side ; the line reaching 

 neither the inner margin nor the ajjex. 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 grouj) 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 tibijB spinose ; first joint of fore tarsi armed 

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



S. elsji Strk., Lep. Rhop. et Het. 126, pi. xiv, figs. 4 and 5, Spldux. 



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

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

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



