38 



Fore wings snow white, sprinkled with ferruginous-brown scales, 

 especially on the outer half of the costa ; a spot of these scales 

 before the base of the fissure runs obliquely to a darker spot on 

 the costa, and this is nearly connected by a dark shade with an- 

 other brown costal spot near the apex ; a dark-brown fine streak 

 on the outer half of the costa of the second lobe extends through 

 the fringe under the apex ; all of the rest of the fringe is snow 

 white. Hind wings dusted with cinereous brown. 



Habitat. California, New York. 



" The larva feeds upon different species of Solidago. The first 

 examples were noticed on May 30. At this time they were found 

 only on the under side of the leaves, later they occur on the upper 

 as well. As a rule, they lie close to and parallel with the mid- 

 vein. At least while young they eat out the parenchyma, leaving 

 the epidermis. 



" May 30 the larvae were .1 of an inch and less in length; en- 

 tirely white, except claws and mandibles. The body is not flat- 

 tened at this stage. The first ring is broad, and the head may be 

 well withdrawn into it. The tubercular hairs are spined, plainly 

 seen under a moderate magnifying power. 



"June 3 the largest had evidently moulted, length then .2 of an 

 inch, pale green, eighth and ninth rings yellow. Lateral tufts 

 more conspicuous. Dorsal line faint. Subsequent changes not 

 noted until full-grown larva was described the latter part of June. 

 Length .34 to .4 of an inch. Pale pea green, head paler; dorsal 

 stripe of three white lines, the middle one the finest and most 

 clearly defined. The seventh, eighth and ninth rings yellow. 

 The posterior subdorsal papilla of the body rings bears two un- 

 equal hairs, the anterior but one ; above the spiracles and in front 

 of them also is a papilla; below the same there are two, from 

 which arise long hairs, five from posterior and ten or twelve from 

 anterior, these are spread out fan-like ; below these a prominent 

 longitudinal fold. From the first ring proceed long hairs reach- 

 ing over and beyond the head. Hairs all unbranched and plu- 

 mose. The body is considerably flattened, so when looking down 

 upon it the spiracles from either side may be seen at once, spira- 

 cles conical, rings black. 



"The pupa is .3 of an inch in length; light green, some of 

 them have a reddish stripe along dorsal part of the abdomen, the 

 conical spiracles of such have the same hue. The upper part of 

 the rings well clothed, especially at extremities and along the 

 lateral ridges. Pupa fastens to a tuft of silk by means of the 



