102 



Journal New York Entomological Society. [Voi. x. 



odoriferous sack, but when denuded rather slender and only two thirds as long as 

 in Tliyclla : they end dorsally in two slender spurs which are longer in the J than in 

 the <y ; these spurs are not so stout as in Thyclla. Genitalia (Figs. 2, 5, 6j allied 

 to those of Thyello, but the suranal plate is narrower, compressed, subcultriform. 



Y\v, 



Fig. 4. Fig. 5. 



Fig. 6. 



AciDithocampa bdina. 3, venation of hind wing; 4, a palpus denuded; 5, 

 genitalia, sternal view ; 5, suranail plate ; cl, clasper; /, penis ; 6, genitalia, side view ; 

 s, suranal plate ; cl, clasper ; />, penis. 



while that of Thyella is broad and flat ; the single pair of claspers are wide, but seen 

 from above longer and slenderer than in Thyella. The penis is a cylindrical subacute 

 process. 



In its imaginal characters this genus agrees with Thyella in the 

 shape of the front of the head, the palpi and especially the plumose 

 antennae with their long delicate densely ciliated branches, as well as 

 in the shape and nature of the ocelli of each pair of wings ; also in 

 the $ genitalia. It differs decidedly from N'udaure/ia, with which it 

 has been associated, both in the antennae and venation. The 9 

 antennae being subsimple, the species need not be confounded with 

 those of Antlifriiia and Melanocera, in which the 9 antennae are stated 

 by Sonthonnax to be nearly as widely pectinated as in the male. Its 

 divergence from Thyella is brought out in the preceding description. 



Larva. — Generic characters. While the imago approaches Thyella 

 in its most important characters, the larva is generically related to Nu- 

 daiirelia {N. dioue especially). It differs in the considerably shorter 

 spines, which, however, are not curved as they are in that species. 

 The dorsal spines of the thoracic and abdominal segments are all of 

 the same length and size ; the median dorsal spine of the eighth ab- 

 dominal segment is more deeply divided than in N. dione. It differs 

 also from N. dioue in the presence of the numerous flattened fungoid 

 warts, there being none present in that genus, so far as yet known. 



The genus is represented by A. belina ( Westwood) a not uncom- 

 mon species in Natal (of which, according to Rothschild, Anthcreea 



