44 U.S. NATIONAL MUSEUM BULLETIN 25 6 



the Melitara type, and produced adults later in the same month after 

 a pupal stage of approximately 10 to 14 days. The moth has a wing 

 expanse of about 18 mm., and hence is not more than half the size 

 of A. parabates. 



NANAIA Heinrich 



This genus was erected by Heinrich for a new species from Peru. 

 There appears to be a second form occurring in the same country. 



Nanaia substituta Heinrich 



This insect was first found in December 1928 at Cuzco and Tarma, 

 Peru, where the larvae were attacking the Cylindropuntia 0. exaltata. 

 It was very common at Cuzco, and caused appreciable damage to the 

 plants by destroying the terminal segments. The larvae were inactive 

 in cells, and adults were not reared. 



In 1936 larvae were again abundant at Cuzco in late September and 

 early October in both 0. exaltata. and another Cylindropuntia 0. 

 tunicata; they occurred less freely in Trichocereus cuzcoensis. They were 

 about three-quarters grown and were inactive in cells. The species was 

 located at Arequipa, Peru, in 0. exaltata but was not common in that 

 area. 



Adults from Cuzco material emerged in December and January. 

 They are rather slender moths with a wing expanse of 1}^ inches; the 

 forewings are light brown and the hindwings white with a smoky suf- 

 fusion. The green-blue larvae are solitary feeders in the terminal 

 segments, where they hollow out a large cell. 



Parasites. — From dead larvae collected at Cuzco were reared the 

 ichneumon Baryceros albosignata and the braconid Apanteles cactobro- 

 sides. 



Nanaia Heinrich, sp. 



Somewhat green-blue larvae were found in October 1936 in the 

 terminal segments of Trichocereus sp. at Verrugas in the Rimac Valley, 

 west of Lima, Peru. They spun frail cocoons containing brown air 

 globules within the feeding cells. Two adults which were reared in 

 December appeared to differ from the preceding species. 



CACTOBLASTIS Ragonot 



This is a South American group with four distinct and a fifth doubtful 

 species; the latter insect, Cactoblastis ronnai (Brethes), will prove to be, 

 it is thought, a synonym of the type species C. cactorum (Berg). 



