A Classification of Lepidoi^terous Larvae. 227 



Pheosia dimidiata Herrich-Schaflfer. 



I have shown how the setas of i are borne on the base of the 

 fleshy horn on 8th abdominal segment and are not united (see 

 Psy.L'he, vol. Yl, p. 194). 



All the species of Datana and Ichthyura illustrate the secondary 

 hairs arising from the skin. 



Family Geometridae. 

 Calocalpe undulata Linujeus. 



Corresponding- to the absence of legs on so many segments, and 

 the consequent exposure of the ventral surface, we find the three 

 tubercles of vii well separated, and each as well developed as any 

 other on the body. The arrangement is: i at anterior third of 

 segment; ii at posterior third and a little lower down; iii lateral, 

 anterior; iv some distance behind the spiracle opposite its lower 

 edge; v before the middle on the substigmatal ridge; vi anterior, 

 subventral, nearly in line with vii a; viib posterior, vii c anterior, 

 and viii again posterior, each a little nearer the midventrai line 

 than the preceding one. 



Family Drepanidae. 

 Oreta rosea Walker. 



This little larva has lost all trace of tubercles. It is granular, 

 the segments annulate, with a large unpaired process dorsally on 

 the metathoracic segment. ' 



Platypteryx arcuata Walker. 



I have not had this larva for special examination. It occurred to 

 me in Plattsburgh, jS". Y., on the black birch and alder; but I have 

 apparently fallen into some error in my notes in regard to the 

 tubercles. Still, I give them, as they show tubercle iv to be in the 

 required position.^ 



Head higher than joint 2, bilobed, subquadrate, sutures distinct; 

 sordid whitish, the small clypeus red-brown ; two dark red-brown, 

 arcuate, concentric bands cross the head transversely, the lower from 



^ In correcting the proof I am able to explain the apparent anomaly. I 

 have found a dead larva in an old cocoon. There are several secondary hairs 

 developed, one of which is very distinct, situated near tubercle iii, the others 

 subventral. My notes are correct, except that I did not mention tubercle vi, 

 which is present posteriorly, subventrally. The arrangement is the normal 

 one of the Macrolepidoptera. 



