NO. 1140. NOR TH A MERICA N NO C T UID A E—SMI TH AND DYAR. 11 



Pupae. — In his full and valuable account of the English Apatelae, 

 Dr. Chapman divides the genus into three sections or genera on pupal 

 characters. His third section comprises only Ugustri, which is not an 

 Acronyctid at all, and may be omitted from consideration. There 

 remain two groups, the first with the pupa of the ordinary Koctuid 

 pattern, smooth, brown, tapering regularly from the thickest part of 

 the thorax to the anal segments, which are somewhat rounded, the 

 abdominal segments punctured in front; cremaster with a series of 

 curved spines or hooks in two sets, one above the other. This section 

 includes the larvae of the first three groups. 



The pupae of Dr. Chapman's second section (I have transposed his 

 numbers) are black, or nearly so, with a rough wrinkled surface, the 

 free abdominal segments as wide or wider thanthosein front, the termi- 

 nal segments rapidly tai)ering. The posterior margin of each segment 

 has a raised band, like a barrel hoop, which is smooth. Cremaster 

 furnished witli a bunch of stiff", brown bristles. This section corre- 

 sponds to the fourth group of larvae. 



There is thus an exact corresi)ondence between pupal and larval 

 characters, but the latter are more delicate, defining three groups where 

 the pux)ae can show but one. On the other hand the characters drawn 

 from the male genitalia are still more sensitive and indicate more 

 groups than the larvae, while contradicting none. 



ANALYTICAL KEY TO THE KNOWN LARVAE OF ACRONYCTA. 



1. Warts, small, subfnnctioual, few or siugle haired at maturity; secondary hairs 



more or less developed, rangiiij;; from none to a complete development. Pupae 



smooth, tapering. (C«8j;irfi« Chapman) 2. 



Warts, large, functional, many haired ; secondary hairs absent from body, the 

 wart hairs sometimes of two forms. Pupae rough, the posterior edges of 

 the segments marked with suiooth raised rings. ( Viminia Chapman ; larval 

 section IV) 31. 



2. Secondary hair abundant, predominant. (Larval section I) 3. 



Secondary hairs few or absent, never predominant 10. 



3. Without contrasting dorsal hair pencils at maturity 4. 



With distinct hair pencils in the last stage, rising above the secondary hairs. 7. 



4. Hair parting in irregular tufts to show a series of dorsal marks aceris.^ 



Hair not parted; black pencils present dorsally l)efore the last stage 5. 



5. Hair long, thin, and pale 6. 



Hair dense, short, brown, and black hastidlfera, 



6. Hair soft, curving over unsymmetrically leporina,^ 



Hair soft, but straight, not curved frigida. 



7. Pencils only on joints 5, 7, and 12 8. 



Pencils on other joints besides 5, 7, and 12 9. 



8. The ))cncils on joints 5 and 7 paired americana. 



No pencils jtaired dactylina. 



9. No pencil on joint 6 populi. 



A pencil on joint 6 as distinct as the others _ rubricoma. 



'European. ^^ American and European. 



