54 INSECUTOR INSCITIjt MENSTRUUS 



jars. From one group a series of four specimens of A. coryliella Dyar 

 was obtained about July 1 2. From the second lot another series was 

 obtained of an entirely different species, which will be referred to later. 

 The cocoon of A. coryliella Dyar is about 1 5 mm. long and 6 mm. in 

 diameter at its widest point. It is quite striking in appearance, the dark 

 frass of which it is constructed being neatly covered with a smooth coat- 

 ing of white silk except sometimes toward the base, where it is gray. It 

 is straight and tapers only slightly toward the base, where it may be as 

 much as 4 mm. in diameter. It is rounded at the outer extremity and 

 the outline of a small circular opening, left open until toward the last and 

 then closed by the larva in spinning its cocoon, is strikingly noticeable. 



/ Acrobasis ostryella, new species. 



On June 30, 1912, a few cocoons of an Acrobasis were found 

 attached to the webbed leaves of Ostrya virginica. From these emerged, 

 from July 1 to 17, two males and one female of a new species the 

 description of which is here given. 



Head and antennae yellowish ; labial palpi gray near base, second and 

 terminal joints brown, paler on inner side ; maxillary palpi whitish on in- 

 side, brown externally. Thorax and patagia lilac above, on the lower 

 side the former is whitish ; the scales in front of the fore legs pale lilac 

 gray ; abdomen brown, annulate with yellowish. Legs with the coxae, 

 femora, and tibiae of the middle and hind legs white shaded with brown ; 

 the tibiae with a terminal cuff of pure white scales with a brown band 

 just above ; the tarsi brown, annulate with yellowish at the joints, indis- 

 tinctly so in the case of the hind legs ; the fore legs much more brown 

 than the other pairs. The fore wings pinkish lilac ; the scale ridge prom- 

 inent, black ; the baseJ portion of the wing is much paler than the general 

 color ; a triangular black shading, extending from the basal fourth to the 

 middle of the costa and narrowing toward the dorsal area, just beyond 

 the scale ridge ; posterior transverse line pale, curved outwardly in the 

 middle, bordered by a narrow black shading inwardly and by emother 

 narrow band outwardly, darker than the ground color, beyond which the 

 color is gray ; the posterior margin with a row of five or six black dots 

 followed by a faint line in the gray cilia ; the costal margin from the mid- 

 dle to the posterior line whitish, beyond which it is bordered with black 

 to the apex ; on the under side yellowish shaded wdth black, costa not 

 so shaded ; discal dots separate ; notch in costa one-fourth from base. 



