52 U.S. NATIONAL MUSEUM BULLETIN 25 6 



Cactoblastis mundelli Heiarich 



This species is known from one locality only, Arequipa, altitude 

 7,500 feet, in southern Peru, where it was discovered in October 1936 

 attacking the Cylindropuntia 0. exaltata. Both full-grown larvae and 

 pupae occurred in early October. Adults emerged from October 12 

 to November 14. The larvae were gregarious and burrowed downward 

 through the segments toward the base of the plant. In color they 

 closely resembled those of C cactorum. The cocoons, similar to those of 

 cactorum, were present among debris at the base of the attacked plants. 

 The forewings of the adults bear a yellowish suffusion which is not 

 found in other members of the genus. 



Cactoblastis bucyrus Dyar 



The adults are darker in color than other species in the genus, with 

 the hindwings of both male and female wholly brown or fuscous. 

 C bucyrus occurs in western Argentina, where it has been recorded 

 from the Provinces of Mendoza, Catamarca, and Tucuman. The 

 known host plants are Trichocereus terscheckii, Denmoza rhodacantha, 

 Echinopsis shajeri, and Echinopsis sp. (probably E. tuhiflord). 



The larvae are gregarious and are definitely larger than those of 

 C. cactorum and C doddi. They form large cavities in the thick stems 

 of the host plants, at least one of which, Echinopsis sp., may be com- 

 pletely killed by the attack. 



There would appear to be two generations annually. Several colonies 

 of full-grown larvae, collected at Andalgala in Catamarca Province 

 in early February, pupated during the same month and produced 

 moths in late March; eggs laid by these moths hatched, after an 

 incubation period of 35 days, at the end of April. At Tapia, in northern 

 Tucuman, full-grown larvae were located in August; they pupated 

 in September and yielded adults in the latter part of October. Two 

 eggsticks found in the field in this area hatched in late November; 

 one stick contained 42 and the other 102 eggs. These eggs were brown 

 and were of appreciably larger diameter than those of C. cactorum 

 and C. doddi. 



CAHELA Heinrich 



This genus is restricted to one species from North America. 



Cahela ponderosella (Barnes & McDunnough) 



During the Board's investigations this species was located over a 

 wide area from western Texas to southern California, northward 

 to southern Colorado and southern Utah, and southward into the 



