1864.] • 393 



ratlier large sable costal spots, of which the costo-apical is the largest 

 and semi-ovate, oblique, and edged with silver gray. At the base of 

 the discal space is a tawny brown spot, margined without with silver 

 and centered with a triangular silver spot. There are two similar tawny 

 oval spots below, one situated at the base of the submedian space, con- 

 tains an elongated angular silver spot ; the other is distinctly oval, 

 and destitute of any silver center. These two tawny spots form part 

 of a median oblique band which narrows in width upon the first sub- 

 costal nervule, and below runs towards the internal angle, just beyond 

 the middle of the inner edge of the wing. An inwardly curved line of 

 silvered sable brown passes from the internal angle to the apex, en- 

 closing a dark marginal region which contains three nearly straight 

 silvery lines which ai-e slightly interrupted upon the nervules, the outer 

 one following the contour of the border. 



Secondaries darker than the primarie!^, some obscure silvery lines on 

 the costa towards the apex. Ends of the nervules lighter than the rest 

 of the wing. Beneath the wings are nearly concolorous with the upper 

 side of the hind wings, the transverse line faintly reappearing on the 

 fore wings. 



Length of body, 1.20; exp. wings, 2.50 inches. 



Taken on the low grounds behind the Museum Comp. Zoology, Cam- 

 bridge, Mass., by Mr. C. A. Shurtleff. Also in Dr. Harris' collec- 

 tion. 



Judging by Mr. Grote's figure of S. quadrigiittatus, this superb spe- 

 cies is smaller, the fore wings are more falcate, its colors are of a darker 

 shade, and the two basal silver triangular spots on the fore wings are 

 several times larger than in the species from the Great Slave Lake. 



In the natural order the S. humul! of Em-ope would connect this 

 genus with Hepialus, as it is smaller, and otherwise approaches that 

 genus more closely than any known American species. 



HEPIALUS Liun. 

 Hepialus mustelinus n. sp. 



9. Sable brown. Head and thorax sable brown. Scales at the base 

 of the abdomen and secondaries yellowish brown. Three broad silvery 

 spots on the costa margined with black; a broad silvery line along the in- 

 ternal margin, which is continued as a submarginal oblique straight line, 

 dislocated on the 2nd median, and margined with yellowish brown, with 



