244 THIKTTETH REPORT ON THE STATE MUSEUM. []32] 



the cell, with an outward inflection from the costa to the sub- 

 costal nervure, an inward inflection in the cell to the first 

 median nervule which it follows for a short distance, and 

 thence proceeds in a double curve to the internal margin. 

 Another black line, less heavily marked, runs irregularly 

 from the costa to the internal margin, passing over the middle 

 of the cell. Between the stronger transverse lines are fainter 

 ones, which sometimes reticulate with the former. The thorax, 

 abdomen, basal and internal portion of the hind wings, are 

 thickly clothed with pale gray hairs or elongated scales : 

 the remaining portion of the hind wings (the portion preserved 

 in the example) is as thickly scaled as the primaries, and nearly 

 as distinctly lined ; beneath they are stronger lined than above. 

 Palpi barely extending beyond the eyes, clothed with white 

 scales interspersed with narrow black ones. Thorax beneath, 

 with long gray hairs. Legs similarly clothed, with their tibiae 

 and tarsi banded with black. 



Length of body, with extruded ovipositor, 1.50 inch. Ex- 

 panse of wings, entire, unknown ; from one discal cross-vein 

 to the opposite, 1.85 inch. 



The pupa-case projecting from the tree, was that of a moth 

 t differing in sex from the captured example, but presumably of 

 the same species. It measures 1.40 in. in length and 0.3 in. 

 in its broadest diameter. Its color is about that of the ? of 

 C. robinice, but of a paler brown than the $ of that species. 

 Its terminal segment and rows of teeth on the segments are 

 darker brown, approaching fuscous, but presenting quite a 

 contrast with the black terminal segment and wing-cases of 

 C. Centerensis. Its armature (transverse rows of teeth) is 

 much stronger than in the ? C. roMnice, and a little more so 

 than in the $ . It is stronger than in C. Centerensis (in which 

 the armature is nearly equal in the sexes), having the teeth 

 longer, although not so broad at their base : on the 8th, 9th and 

 10th segments, the teeth continue quite prominent in their ex- 

 tension below the stigmata, where in C. Centerensis they are 

 weak. 



The armature of the pupa-cases of Cossus, unquestionably 

 presents excellent specific characters. From its study, I am 

 able to announce the existence, in the State of New York, of 

 another species of Cossus, boring in the white birch (Betula 

 populifolia\ the imago of which has not yet been detected. 



