— ig2 — 



summit The body is cylindrical in shape, largest at the posterior middle, 

 and tapering in both directions, though less posteriorly than anteriorly. 

 [t is generally of a dull clay green color, varying to nearly clay white 

 and to yellowish green. This ground color is much taken up by broken 

 and irregular blackish bands. ' >ne, dorsal, is narrow and generally con- 

 tinuous ; another, subdorsal, is broader and broken ; a third, supra- 

 stigmatal, is still broader and still more broken, being composed of ir- 

 regular short lines or striations. The portions of the ground color 

 showing-, are generally more or less oval in shape. The stigmata are 

 clay white, oval, annulated with black. Beneath blackish, with man) 

 oval shaped spots of clay white. Prolegs black, ventral dull reddish. 

 hairy, feet black. On each of the first live segments of die body and on 

 the ninth and tenth are 8 spinous processes; the sixth, seventh and 

 eight have 6, and the eleventh has 5. These are arranged in rows, as 

 subdorsal, lateral and substigmatal ; where the two extra processes exist, 

 they are supra-pedal, and where one, it is dorsal. The supra-pedal, sub- 

 stigmatal, and lateral spinous processes consist of a number of small 

 spines about the base of a single larger and black spine. Those about 

 the base are black at bottom, whitish yellow towards apex, black at apex. 

 The subdorsal processes on the first segment are like those already tie- 

 scribed. On all the other segments, except the second and eleventh, 

 the subdorsal spinous processes consist ol one main spine with many 

 small spinules growing out of it except towards the apex. The spinules 

 are yellow, the central spine is black. The processes on the second and 

 eleventh are a compound of both the other forms. 



The larvae were very common at San Bernardino, in mam- cases de- 

 nuding the trees. As has been said Mr. Doll found them in Central 

 Arizona. In Eastern Arizona and Western New Mexico, along the A. T. 

 and Santa Fe R. R., in many places the Cottonwoods were entirely de- 

 nuded of leaves by some insect, very likely the larva of this species. 



The larvae pupated in Arizona the first week of July, and being 

 brought to Brooklyn the imagines emerged about the middle of 

 November. 



Mr. Grote in his Catalogue, 1882, puts this insect as a variety of 

 Hemileuca Maia, Dm., which it seems to be. Mr. .Stretch in his de- 

 scription notes some differences in the color of patagiae, and the markings 

 of the fore wings. But I have seen many //. Maia from Texas which 

 showed the patagiae of the color of the typical //. Nevadensis, and which 

 varied very much in the color of the wings — some being almost immac- 

 ulate black, and others having the white band almost covering the wing, 

 and this too in the same sex. But in Texas as I believe in the East and 



