THE CANADIAN ENTOMOLOGIST, 237 



THE CRANBERRY FRUIT WORM.* (Acrobasis vaccinii. N. spj 



BY PROF. C. V. RILEY. 



Acrobasis vaccinii, n. s. — General color and appearance of A. in- 

 digi?ie//a Zell. (nebulo Walsh) but a somewhat smaller species, with prim- 

 aries usually narrower. It may be distinguished by the following differ- 

 ences as compared with ijidiginella : 



' Average expanse, 15 mm. Colors of a colder gray with less reddish- 

 brown or tawny on the inner portions of primaries, and with the pale 

 costal parts nearly pure white, so as to contrast more fully with the dark 

 shades, and to more fully relieve the basal branch of the forked shade on 

 inner part of first or basal line, this basal branch being also usually darker 

 than the outer or posterior branch. The triangular costal patch from the 

 basal line is obsolete. The transverse pale lines are less clearly defined 

 and the terminal is nearer the posterior border of the wing, /. e., the 

 median field is wider. The geminate discal dots are always well separ- 

 ated and the inner one well relieved by the white which extends around it 

 on the darker ground and often forms an annulus. The oblique shade 

 from apex is less clearly defined. 



Described from 16 specimens of both sexes, reared from cranberries. 



Egg. — About 0.4 mm. long, and 0.3 mm. broad ; ovate or almost 

 circular, and flattened or plano-convex, the form varying with the surface 

 of attachment to which, while plastic, it partly conforms. Color, olive- 

 green or brown. 



Larva. — Average length when full grown 10 mm. Convex above, 

 flattened beneath. Surface of body minutely granulate with a dull, some- 

 what greasy appearance. Color varying from greenish-yellow to olive- 

 green, reddish or brownish, being generally darkest towards the anal end. 

 Head yellow, polished, somewhat lighter towards the mouth, with the 

 sutures of the clypeus slightly brown, and the anterior angles of the head 

 distinctly so ; labruni, antennae and palpi white ; mandibles yellowish at 

 base, becoming blackish toward tip ; ocelli black. Cervical shield some- 

 what paler than the head, almost colorless anteriorly, its median line 

 scarcely paler, without any markings, except a brownish or blackish wart 

 a little in front, above the stigma. Anal plate of same color. Stigmata 

 extremely small, except first and last pair, oval and pale brown. Pili- 



* From advance copy from the forthcoming Annual Report of the U. S, EntOi 

 niolo£;ist. 



