8 GROTE AND ROBINSON. 



genus then, at least provisionally, may contain species in which the 

 9 antennal stem may be either simple or basally pectinate; the slight 

 processes with which the antennae of 9 A. bicolor are provided, con- 

 trasting as strongly with the long pectinations of 9 -^- cadnius, as 

 with the simple ones of 9 -^- grandis. Adelocephala, as here con- 

 sidered, stands higher than Anisota, of which it is, in a certain sense, 

 an out-growth, so speak. Its position is intermediate between Cithe- 

 ronia and Anisota. In arranging the species of this latter genus we 

 naturally begin with Anisota stigma, and conclude with A. rubi- 

 cunda, a species in which the typical tribal coloration is lost, and the 

 appearance of the moth is disturbed by its analogies with a lower and 

 succeeding Group of Bombycidae. 



The North American species referred to, Adelocephala, are as 

 follows : 



Adelocephala grandis. n. s.. (Plate 1, fig. 7, 9 )• 



9 . Size, large; form, stout and heavy. Head, rather small and 

 sunken, invisible from above, owing to the well developed and advanced 

 prothoracic parts. Antennae, simple, short, basally thickened ; com- 

 pared to the size of the insect they may be termed slight. Abdomen, 

 stout and heavy, projecting beyond the anal angle of secondaries. 

 Thorax, globose, heavy and short. The squamation is thick and 

 close, but not woolly, rather smooth and evenly distributed over the 

 body parts. The color is rather pale brownish ochreous ; beneath, 

 with a roseate hue which suffuses the under abdominal parts, and is 

 continued over the under thoracic parts and legs at base. The tarsi 

 and tibiae are purplish, at least outwardly, the anterior pair the 

 darker. 



Wings, full and large. Anterior wings somewhat arched along costa 

 from base to apices, which latter are acuminate but depressed. The 

 external margin is somewhat sinuous, since it retreats inwardly below 

 apex to disco-central nervule, where it is somewhat bulged out, round- 

 ing thence to internal angle, this latter improminent and rounded off. 

 the internal nervure and margin of the wing being straight and short. 

 Discal cell retreating towards the base of the wing and squarely closed 

 by a stout and true nervure. Above, the primaries are brownish 

 ochreous. A straight, short, obliquely transverse, darker shade line at 

 base crossing the discal cell. About the discal cross-vein, a faint 

 clouded darker shade. The median space is paler than the wing else- 

 where and bounded outwardly by a second, greatly longer and more 

 prominent and deeper colored transverse line, which emanates from 



