OF WASHINGTON. 47 



Acrobasis betulella Hulst. 



On black birch, Maine, July 18-23, 1887 (A. S. Packard) ; 

 two, Center Harbor, N. H., larvae on birch, June 24, 1902, 

 adult July 9, 1902 (H. G. Dyar) ; larva in web on birch, 

 Platte Canyon, Colorado, June, 1901, adult, July I, 1901 (H. 

 G. Dyar) ; five, bred from Birch, Sisson, Cal. (A. Koebele) ; 

 one, bred from white birch, Hampton, N. H., July 9, 1906 

 (S. A. Shaw). The Calif ornian specimens are a shade paler 

 and smoother than the Eastern specimens, but do not greatly 

 differ ; the Coloradan specimen is as dark as the Eastern ones. 



Acrobasis coryliella, n. sp. 



A single male specimen before me, scarcely distinguishable 

 from carycs and betulella, but labelled " Phycita on Hazel, 

 June 14, 15, 1876. No. 96 " in a handwriting which may pos- 

 sibly be that of Doctor Lintner. It bears also Grote's de- 

 termination "Acrobasis rubrifasciella." The food plant indi- 

 cates a different species and the moth also is grayer, more 

 uniform, without white shading, the outer line more distinct 

 and finely crenulate. Mr. Ely has kindly given me three 

 specimens from East River, Conn., that seem the same but 

 have no record of food plant. Their dates are August 6 

 and ii. 



Type. No. 11551, U. S. National Museum. 



Acrobasis malipennella, n. sp. 



Head and thorax cinereous, tinged with coppery red; abdomen dark 

 gray, the segments whitish at their tips. Fore wing short and broad, 

 the cell broad, veins 2 and 3 arising close together, 4 and 5 from a point 

 distant from them; gray, the scale ridge black, reaching half way across 

 the wing, followed by a red shade and a black triangular cloud on 

 costa; median field whitish frosted toward costa, enclosing a single 

 black discal dot near the costal edge; outer line obsolete. Hind wing 

 with the lower angle of the cell produced, veins 4 and 5 stalked ; uni- 

 formly dark gray. Expanse, 13 mm. 



One male, East River, Conn., August, 1907 (Chas. R. Ely). 

 A second specimen is possibly the female of this species, but 

 its wings are long and narrow as usual, while the venation is 

 normal ; the color resembles that of the male specimen, but 

 the outer line is visible, mesially exserted, crenulate, outwardly 

 pale, followed by a dark red shade ; discal dots double, sepa- 

 rate, black. 



Type. No. 11552, U. S. National Museum. 



The male is easily distinguished by its peculiar short wings ; 

 the female, if rightly associated, has the wings of normal 



