﻿88 



SEVENTH ANNUAL REPORT 



On the costa, opposite the beginning 

 of the outermost dark band of the upper 

 surface, and on tlie edge of the disk, 

 are dusky spots on tlie lower surface of 

 the wings. Along the median nervure 

 beneath is a dark line. These marks 

 are sometimes indistinct. 



Antenna} of female pubescent with the 

 joints constricted in middle. 



Abdomen terminating in a retractile ovi- 

 positor; rather acutely tapering behind. 



Whole body and legs of the female 

 pubescent, clothed with whitish and 

 brown or black dentate scales or hairs ; 

 general coloration not uniform. A black 

 band along the middle of the back 

 of the abdomen, often interrupted on the 

 second to seventh joints ; with a whitish 

 patch each side of its front end ; the 

 spines frequently giving a reddish ap- 

 pearance to the part they occupy. 



Crest of prothorax and mesothorax 

 black. 



Of a rather smaller size than pometaria, 

 the wings of the male expanding from 

 0.86 — 1.30 inches, and the female measur- 

 ino: 0.20 — 0.35 inch in leno^th. 



The outermost pale band of the front 

 wings, with its angulation, and the band' 

 cf the hind wings are also visible on 

 the under side of the wings. Within the 

 angulation is a brown or blackish spot 

 on the costa. 



Antenna) of male more serrate and 

 hairy ; the serrations darker. 



Antenn.-e of the female naked, with 

 the joints only half as long as in rer~ 

 nata, and uniform in diameter. 



Abdomen not terminating in an ovipo- 

 sitor ; rather bluntly tapering behind. 



Whole body and legs of the female 

 smooth, clothed with glistening brown, 

 and white truncate scales intermixed, 

 giving it an appearance of uniform shiny 

 dark ash-color above and gray beneath. 



The wings of the male expand from. 

 1 .05-1 .35 inches ; and the female measures- 

 0.25 to 0.40 inch. 



CONCLUSION. 



We thus have two distinct species of canker-worms, difFerino; not 

 only in habit, but differing so much structurally in all states (except^ 

 perhaps, the chrysalis state) that they may at once be distinguished 

 from each other. In contrast with the soft delicate ovoid eggs secreted 

 in irregular masses, the 10 legged larva, and the spined and hairy 

 moths of vernata; we have the tough, flower-pot-shaped eggs, laid in 

 exposed regular masses, the 12-legged larva and the spineless, smooth 

 moths of J9<?me^«r^a; and the specific structural differences are still 

 apparent when we come to examine the genital armature of the males. 

 It is really remarkable that these differences have remained so long 

 unnoticed, especially in those parts of the country where pometaria 

 abounds. As a fitting conclusion to what I have written on this subject,, 

 it gives me pleasure to be able to reproduce, through the courtesy of 

 Mr. Mann, who copied them for me, portions of the original premium 

 essay on the Canker-worm, by Mr. Peck, not only because of the value 

 and accuracy of the observations, but because they show so conclu- 



