282 PROCEEDINGS OF THE ACADEMY OF [1893. 



DESCRIPTIONS OF TWO NEW SPECIES OF NORTH AMERICAN 



BOMBYCIDAE. 



BY HERMAN STRECKER. 



Cossus Ore. 



S Light grayish. An term re pectinated. Head and thorax 

 heavily clothed with coarse, dark brown and whitish scales ; abdo- 

 men with grayish hair, beneath somewhat paler. 



Primaries. Ground color light gray but more or less suffused with 

 brownish especially on the basal two-thirds. The whole Aving is 

 striated, mottled might almost be the better term, with fine intersect- 

 ing lines of various thickness which connect and interlace producing 

 a curious and notable effect ; there is a sort of submarginal jagged 

 band (but scarcely deserving to be so-called) formed by the lines 

 there being heavier ; there is also conspicuous mottling interior to the 

 middle of the wing produced by the same cause. The mottling, for 

 it is more mottled than striated, is unlike that of any other species 

 I know of whether native or foreign and will readily and strikingly 

 distinguish this from all others. Secondaries gray, reticulated with 

 fine lines, but with little of the tendency to semitransparency that is 

 shown in some other species. 



Expands 2} inches. 



The 9 is like the $ but broader winged and expanding 3 inches. 

 The antennae but very slightly pectinated. This is a true Cossus 

 nearer to the European ligniperda which it more resembles, except 

 in the style of mottling of the wings, than any species occurring in 

 this country. 



Hab. State of Washington ; captured by Prof. 0. B. Johnson 

 from whom I received it. 



Hepialus Los. 



Head and body unicolorous pale smoky gray, tarsi pinkish. 



Primaries same color as head and body with four datk grayish- 

 brown somewhat oval almost connected spots extending from costa 

 at base obliquely to the inner margin about two-thirds the distance 

 from the base, a small silver spot or dot is the second of these from 

 the costa. On the inner margin another not so conspicuous spot, on 

 the costa two spots or marks, one at the middle and the other interior 

 to it, beyond the first of these, commencing at the costa, an irregular 



