LEPIDOPTEBA OP NEW YORK AND NEIGHBORING STATES 



29 



c&dcBagus, which is retractile, and often works through a ring, the juxta. 

 Its reversible lining is often armed with spines, known as cornuti. The 

 furca, a curious fork or simple spine in some Ennomids, is formed from 

 the lower part of the juxta and may resemble an additional ventral 

 valve. Its two halves are often separate. Besides these parts there 

 is a great variety of secondary struc- 

 tures, of which the most important 

 are the clasper, a hook developed on 

 the inner face of the valve, and the 

 peniculus, a hairy prominence aris- 

 ing from the edge of the tegumen 

 above the valve. 



The end of the valve, especially in 

 the ^Noctuidse, often bears a row 

 or mass of recurved spines, the co- 

 rona (fig. 21). A finger-like process 

 on the dorsal edge of the valve is a 

 digitus, one on the ventral edge 

 a pollex, and one near the base on 

 the inner face (generally hairy) is 

 the editum (dorsally) or clavus (at- 

 tached to the sacculus) . When the 

 clasper is divided, as in Acronycta, its dorsal arm is the ampulla. 



The tenth segment is further reduced. Its dorsal part is the uncus, 

 which is most often a strong hook, but may be divided or reduced to 



Sacculus 



20 



FlG. 20. TYPICAL MALE GENITALIA, SIDE 

 VIEW (EUBAPHE -OSTENTA) 



Corona 

 Anal Spines (Pollex) 



21 



to see without dissection. 



Clasper /^ 



PlO. 21. VALVE OF MALE GENITALIA ( HADETTA DEVASTATRIX) 



a plate, which in some forms is indistinguishably fused with the tegu- 

 men or scaphium; on each side it frequently bears a small appendage, 



