370 PROCEEDII^GS OF THE NATIONAL MUSEUM vol.84 



vember) ; Trinidad (June) ; Brazil, Castro (Parana) ; Paraguay, 

 El Gran Chaco (November) ; Argentina, Villa Ana (February, 

 March). 



Remarks. — Ninety-two specimens (54 males and 38 females) ex- 

 amined, from the collections of the United States National Museum, 

 British Museum, and Cornell University. 



The species is easily identified by male and female genitalia. In 

 all the species I have seen there is none except tinctella that has the 

 genital plate of the female fused to rods of the collar. 



RUPELA NIVEA Walker 



Pl.\te 25. Figures 10-lOc 



Riipchi nivea Waikee, List of the specimens of lepidopteroiis insects in the 

 collection of the British Museum, vol. 28, p. 524, 1863; male. 



This species, though quite distinct in genital characters from any- 

 thing else in the genus, has long been listed as a synonym of alhlneiJa 

 Cramer. I am indebted to Mr. Tams for examining genitalia of 

 Walker's type and giving me the correct identification. 



Male. — Wings pure white. Fore wing with veins 4 and 5 closely 

 approximate, connate or stalked; 11 and 12 closelj^ approximate or 

 anastomosing. Hind wing with 4 and 5 closely approximate, con- 

 nate or stalked. Anal tuft white. 



Alar expanse, 24-37 mm. 



Genitalia with gnathos beaklike, heavy, smooth, broad at base (in 

 ventral aspect), tapering to bluntly pointed apex. Uncus broad at 

 base and tapering to apex, stout; basal part extended backward into 

 bulbous lobe ; from lateral view widest and slightly humped at middle 

 (decidedly humped in specimen from Castro, pi. 25, fig. 10c). Harpe 

 with apex tapering and rounded; basal process of costa {Clh) greatly 

 extended, digitate ; sacculus produced into clasper (6^/) ; the latter 

 a long, stout, straight spine. Anellus consisting of a rigid ventral 

 plate and a dorsal membrane which attaches to the aedeagus ; u.pper 

 (caudal) margin of plate deeply incised; membrane rugose, the 

 wrinkles appreciably sclerotized. Aedeagus smooth; cylindrical; 

 tapering slightly from beyond middle to apex. 



Type. — In British Museum. 



TyjJe locality. — Para (Santarem), Brazil. 



Distribution. — Panama, Porto Bello (April, May) ; Brazil, Castro 

 (Parana) ; Argentina, Gran Chaco (October), Villa#Ana (January, 

 February), Goya. 



liejiiarhs. — Twelve specimens examined. These are all males and 

 are from the United States National Museum and British Museum 

 collections. The Castro male (from the British ISIuseum collection) 

 is somewhat abnormal. Tlie uncus is more appreciably humped than 



