252 [September 



shade, and roseate along the costa of primaries. Antenna?, thorax, 

 abdomen and legs ochreous-yellow. 



Egg. Length i hne, pale green, a black ring near one end, oblong. 



Larva. Length 2 to 2^ lines; basal outline elliptical; a flattened 

 ridge widened in the centre, extends from head to tail, curving over 

 vertical elevations at the sides, which gradually diminish before and 

 behind, and terminate at both ends in a rounded margin. 



Around the base, a row of small, densely spined papulae, two of 

 which, on the head, are the most prominent, and colored yellow. The 

 body is smooth, but the ridge is thrown into thick fleshy folds ; it is 

 thickest in the middle, whence it diminishes anteriorly and posteriorly. 



Green ; two bright red lines, of equal length, cross each other at 

 right angles, on the central portion of the upper ridge. 



Pupation. They spin their coccoon in October on one of the small 

 veins of a leaf; it is one line long, oval, dark brown, and shining'. 



Food Plants, the oak and chestnut on which they may be found dur- 

 ing August and September. The imago appears about June. 



I collected the larva of this most diminutive species of the genus, 

 two years ago, and by singular good fortune, carried them successfully 

 through all their transformations. It belongs to the same group as the 

 European asellus, to which it is also closely related. 



Philadelphia. 



