£>D 



Art. V, — Character's of three new Genera of Notodontidae, from 

 North America. By Edward Doubleday, Esq. 



The characters of three new genera of Notodontida? which I now 

 venture to publish have been long drawn out, but from various causes 

 have lain by with those of several other new genera of the same group, 

 awaiting a revision. At the time when they were first roughed out, I 

 had thought of describing the whole of the North Ameiican species of 

 this family in my collection ; but two reasons induced me to abandon 

 my plan, the one an unwillingness to venture on ground likely to be 

 occupied by a far more competent person, the other, that I found my- 

 self aiming at what was beyond my abilities. In all probability these 

 fragments of my projected treatise would, like the rest of it, have been 

 utterly lost to the scientific world, and ultimately have been stowed 

 away in that receptacle for all things lost on earth, — the moon, had I 

 not, through the great kindness of my friend Mr. Raddon, been enabled 

 to accompany them with a plate, representing the sing-ular larvae of the 

 insects to be treated of, and also a most curious insect allied to Mr. 

 Stephens's genus Thyridopteryx, of which more anon. Moreover I 

 have learned by recent letters from Dr. Harris, that what I am now 

 about to do will in nowise interfere with anything he has in hand, and 

 therefore I have tried to put them in a state fit for publication, others 

 must judge if I have done so. 



The drawings from which the accompanying plate was taken, form 

 part of a large series executed by that indefatigable artist John Abbot, 

 and now in the possession of Mr. Raddon, to whom 1 am indebted 

 for their loan for some months, and also for the plate — the better half 

 of this paper; for both which marks of his friendship I seize this op- 

 portunity of publicly returning him my most sincere thanks ; my read- 

 ers ought to thank him for the latter. These drawings are the most 

 beautiful of any of Abbot's that I have seen, and as a large portion of 

 them represent sjiecies not in the seventeen volumes of his drav/ings 

 in the British Museum, they would, if Mr. Raddon could be induced 

 to part with them, make a valuable addition to that collection. 



Family. — Notodontid.e, StepJi. 



Genus. — Heterocampa, Doubleday. 



Maxillse very short and slender : labial palpi short, porrect, triarti- 

 culate, densely clothed with scales and, towards the base, with seta3 ; 

 first joint cylindrical, curved ; second joint one half longer than the 

 first, nearly cylindrical, slightly curved ; third joint fully one-third the 



