2d 



legs pale tawny at tips. Sides mottled with yellow, gathered 

 into a broken lateral line along the upper edge of the yellow 

 markings. Median dorsal line black, sometimes with a narrow, 

 broken bluish line centrally, and a few spots of the same color 

 just above the lateral yellow line on each segment. On each side 

 of the blue dorsal line there is a mottled broken band of bright 

 tawny yellow, the color most concentrated on the posterior part 

 of each segment, thinly clad with pale tawny hairs. Beneath 

 black, mottled with pale bluish-grey. 



Varies by the expansion of the dorsal yellow markings so as 

 to be strikingly yellow, or by their contraction so as to appear 

 nearly blackish-brown. In this last c^se the blue markings be- 

 come strikingly visible. 



This species was only met with at Astoria, though diligent 

 search was made for it at Portland and elsewhere. It was found 

 feeding on the cherry, apple, currant, bramble and rose. A few 

 on plum trees and on a tree allied to the hawthorn, none on the 

 pear. It was most abundant in a badly-tended orchard ; much 

 less common in the one adjacent, where the plastering of the tree 

 trunks with lime showed greater care and attention. The ab- 

 sence of larvae in the same locality on July 31, shows the species 

 to be probably single brooded. 



The nests were long and narrow, very compactly and closely 

 woven outside, so as almost to resemble a thin silken bag. 

 Length about 12 inches, with a diameter of about 1.5 to 3 inches. 



Larva No. 2. — Associated with the preceding on the apple 

 trees, and found on the pear at Astoria, and cherry at Portland, 

 a single larva being also found in the sweeping net at Yakima 

 City, was a second very distinct form of which the following is 

 a description. 



A broad velvety-black dorsal line, narrowly edged with tawny, 

 enclosing a few parallel tawny broken lines, and a dirty white 

 ovate spot on the anterior part of each segment, those nearest 

 the head being narrower than the others. Sides bluish-slate, 

 palest above the feet, divided by a tawny lateral line, very faintly 

 edged above and below with black. Prolegs black; abdominal 

 legs slaty. Beneath slaty, with a large sooty-black spot on each 

 segment on the dorsal line, those on the central segments being 

 most conspicuous. A few short tawny hairs. 



This species I unfortunately failed to rear, of No. i I raised 

 two perfect (5, and many cripples. Not having the types of 

 erosa before me I cannot say if No 1 may be the larva of that 

 species or not, but have forwarded the male to Mr. H. Edwards, 

 who possesses the types of erosa, for comparison.* 



San Francisco, August 9, 1882. 



* The male alluded to by Mr. Stretch was certainly not his Erosn, but appears to me to be a new 

 ipecies. In this genus it is exceedingly difficult to distinguish the imagos.— Hr. Edwards. 



