376 PROCEEDINGS OF THE NATIONAL I^IUSEUM vol.8* 



RUPELA HORniDULA, new species 



Pi.ATE 27, Figures 18-18/ ; Plate 33, FiomiE 47 



Male. — Wings white. Fore wing with veins 11 and 12 separate; 

 4 and 5 connate or closely approximate. Hind wings with 4 and 5 

 connate or shortly stalked. Anal tuft yellow. 



Alar expanse, 22-32 mm. 



Genitalia with gnathos bandlike, simple. Uncus with basal part 

 bifid, produced as two subtriangular, laterally flattened, jagged 

 lobes. Apical part smooth except for a slight dorsal keel near apex ; 

 apex hooked. Harpe broad ; apex bluntly pointed ; basal projection 

 of costa considerably produced and fusing into membranous trans- 

 tilla; sacculus produced at apex" into a short, broad, blunt, up- 

 curved spur; from this a sclerotized ridge extends to the basal pro- 

 jection of the costa. Anellus consisting of ventral plate and a pair 

 of strongly sclerotized, narrow, sinuous, irregularly serrate dorsal 

 plates; ventral plate with upper (caudal) margin deeply angulate 

 and lateral margins excavate. Aedeagus with from one to three 

 ventral thornlike teeth toward apex ; penis bearing a small, flattened, 

 serrate coniutus. 



Type and paratypes. — U.S.N.M. no. 51867. Paratypes also in 

 collections of Cornell University, British Museum and Harold E. 

 Box. 



Type locality. — Campo Bello, Rio de Janeiro, Brazil (Zikan, 

 collector). 



Food plant. — Andropogon hicornis. This food-plant record is 

 from specimens submitted by Dr. H. E. Box, San Jose, British 

 Guiana, April 1936 (Mj^ers no. 5328). 



Remarks. — Described from male type and 25 male paratypes, the 

 paratypes distributed as follows: Brazil, Campo Bello (Rio de 

 Janeiro), two. Organ Mountains (near Tijuca, Rio de Janeiro), one, 

 Ponte Nova (Rio Xingu), three; Surinam, Zanderij (Boven, Para 

 District, April), one; French Guiana, St. Jean Maroni, five; 

 British Guiana, San Jose (Pupunimi District, April), two, George- 

 town, one, Kartabo (Bartica District, October, November), four, Mac- 

 kenzie (June), two, Rio Demerara, one; Trinidad, (Dyar collection, 

 B. M. no. 1923-361), two, (Saunders collection, B. M. no. 94-68), one. 



This species is easily recognized by the structure of its anellus and 

 uncus. There is considerable variation in the size and spining of 

 the basal lobes of the uncus in different specimens, but between the 

 extreme forms (shown in pi. 27, figs. 18fZ and 18e) there is every 

 possible intergrade so that no distinct varieties or races can be 

 established. 



Female unknown. 



