NATURAL SCIENCES OF PHILADELPHIA. 531 



H. C u n e a , Drury. White. Thorax usually unspotted, sometimes with 

 a few black spots. Antennae blackish brown. Fore wings with highly varia- 

 ble markings ; usually with numerous black spots, sometimes with but few of 

 them. Hind wings without spots. Abdomen white, with three rows of 

 minute black spots, frequently inconspicuous. The fore coxae and femora 

 luteous ; tarsi blackish. 



Ga., Mass., Penn. 



H. Echo, Ab. & Sm. White. Fore wings mostly black with white veins 

 and spotted with black. Abdomen luteous, spotted with black. 



Dr. Fitch in his 3d Report describes two other specimens which are referred 

 to this genus. 



Spilosoma, Stephens. 



Fore wings with a single marginal nervule from the cell and another inte- 

 rior to the origin of the post-apical nervule ; apical nervule with a nervulet 

 to the costa near the tip. The subcosto-inferior and discal vein, which is 

 angulated, arise at a common point. Median vein 4-branched, with the pos- 

 terior nervule remote from the others. 



Hind wings about equal to the length of the abdomen, with the wing struc- 

 ture common to the family. 



Head moderate, rather woolly, somewhat sunken and sometimes depressed ; 

 with ocelli. Face moderately broad, tapering. Eyes moderately large. An- 

 tennae shortly pectinated in the $, serrated in the 9 , sometimes simple. 

 Labial palpi more or less exceeding the clypeus, subascendent, hairy beneath ; 

 the first and second joints usually short, sometimes the joints nearly equal ; 

 the first joint squamous and ovate or subcorneal. Tongue slender and as long 

 as the anterior coxa?. 



Body rather stout. Thorax woolly. Patagia usually flattened, sometimes 

 erected and somewhat trapezoidal. Breast woolly. Abdomen rather smooth. 

 Legs downy or hairy ; tibial spur of fore legs long and curved ; hind tibiae 

 with two pairs of spurs near the tip, sometimes minute. 



Table of Species. 



Wings white. 

 Abdomen with black spots. 



Fore wings with many black spots, A c r e a . 



Fore wings with a single discal dot, Virginica. 



Abdomen not spotted. 



Fore wings with oblique, imperfect bands of brownish 



dots, c o n g r u a . 



Wings fulvous, Isabella. 



S. Isabella, Ab. & Sm. Fulvous, or brownish ochreous, sometimes 

 slightly tinged with reddish. Fore wings with a black spot on the disk and a 

 subterminal of the same hue, sometimes faintly banded. Hind wings roseate 

 or yellowish tinged with roseate, with two discal black spots and four of the 

 same hue along the hinder margin. Abdomen with three rows of black spots. 

 Fore femora crimson internally ; tibiae and tarsi black. 



This insect usually regarded as belonging to the genus Arctia, certainly 

 cannot be included in it, in consequence of structural differences. 



S. acrea, Drury. White. Antennae black. Fore wings dotted with 

 black spots, those along the costae being the largest. Hind wings white in the 

 9 , and orange yellow in the $, spotted with black. Abdomen orange yel- 

 low above, with the tip white, and with three rows of black spots. 



S. "Virginica, Fabr. White. Antennae blackish brown, with white 

 1860] 



