THE CACTUS-FEEDING PHYCITINAE — HEINRICH 353 



According to Mr. Dodd the larvae are solitary in habit and dark 

 blue and the eggs laid singly. 

 Alar expanse, 18 mm. 



Type. — In United States National Museum. 

 Type locality. — Uvalde, Tex. 

 Food plant. — Opuntia (Cylindropimtia) leptocaulis De Candolle. 



5. NANAIA, new genus 



Genotype. — Nanaia suhstituta, new species. 



Antenna of male bipectinate; of female pubescent. Labial palpus 

 obliquely porrect (second segment obliquely upturned nearly to top 

 of face and third segment bent forward or slightly downcurved) ; 

 third segment long (in the female as long as second segment), 

 pointed in the male, blunt in the female. Maxillary palpus large, de- 

 veloped as a broad, curved, somewhat flattened tuft of scales which 

 reaches well above middle of face. Hind wing with veins 7 and 8 

 anastomosing beyond cell; 3 and 5 stalked. Eighth abdominal seg- 

 ment of male simple. 



Male genitalia with apical process of gnathos bifid, the two prongs 

 narrowly separated; harpe with the apex somewhat tapering but 

 bluntly rounded; vinculum moderately long (longer than broad); 

 anellus with base of plate narrowly sclerotized, arms long, tapering 

 and slightly twisted; aedeagus moderately stout, strongly sclero- 

 tized throughout. 



Female genitalia without signum; ductus bursae and bursa copu- 

 latrix simple except for fine scobinations in ductus at genital opening ; 

 ductus bursae long; bursa copulatrix small; ductus seminalis from 

 middle of bursa. 



Larva bluish, not banded; sclerotized plates surrounding body 

 setae small ; 2 setae in group "VII on abdominal segments 7 and 8. 



The larvae are solitary feeders in the trunks of Gylindr opuntia and 

 Trichocereus. 



Egg and egg-laying habits unknown. 



Remarks. — This genus is close to ATberada but distinguished by 

 several characters: The fore wings are distinctly narrower, the vin- 

 culum is longer in proportion to its width, the aedeagus more evenly 

 sclerotized, the apical process of gnathos more narrowly cleft, the 

 anellus more decidedly curved, the bursa simple, without signum or 

 scrobinations, the transverse markings on fore wing almost oblit- 

 erated, and the maxillary palpi much larger. The maxillary palpi 

 are similar to those of Sigelgaita.^ the moths of which resemble in 

 general habitus those of Nanaia. The two genera, however, ate 

 easily distinguished by their different labial palpi, porrect in Naimia., 

 upturned in the males of Sigelgaita. 



Known only from Peru. 



