CACTUS-FEEDING INSECTS AND MITES 69 



Larvae of the other generations developing in the large green or ripe 

 fruit remain a light pink color and do not turn dark when full grown. 

 The loose cocoons are spun among rubbish and soil, or occasionally 

 in dead flower heads; the pupae are visible through their frail texture. 

 A few small pink globules resembling air bubbles are intermingled with 

 the silk of the cocoon; similar globules are found in the cocoons of 

 species of Tosemitia and Sigelgaita. A pupal stage of 10 days has been 

 recorded in May, 



Parasites. — Hymenoptera reared from the pupae include the chalcid 

 Brachymeria {Pseudobrachymeria) pedalis, the ichneumon Chelonus electus, 

 and two other undetermined ichneumonids. In cages the larvae are 

 attacked by the braconid Bracon hebetor. 



Ozatnia thalassophila Dyar 



The sole record of this species is that of the type female which emerged 

 in August 1924 at Uvalde, Texas, in a cage containing material of 

 the Cylindropuntia Opuntia prolifera collected at Oceanside, California, 

 in July. It is presumed that the larva had been feeding in the fruit of 

 the plant. The adult had a wing expanse of 28 mm.; the forewings 

 were dark grey with darker markings, and the hindwings were white. 



Ozatnia immorella (Dyar) 



This Mexican species, originally described by Dyar (1913) in Euzophera, 

 was placed under Ozamia by Heinrich (1956), who reported that a 

 series including one male had been reared in 1946 from larvae feeding 

 in the fruits of prickly pear at Zacatecas, Mexico. The distribution is 

 given as Caxaxa, Tehuacan (July), and Zacatecas (December), 

 Mexico, and the food plant as Opuntia {platyopimtia) sp. 



The wing expanse is 25 to 31 mm., and the color and markings of 

 the forewing are similar to those of Ozamia thalassophila, except for a 

 faint purplish red suffusion over the ground color that is especially 

 noticeable on freshly reared examples, and less white dusting on the 

 costal area. 



This insect was not reared by the Board's officers. 



Ozamia stigmajerella Dyar 



This South American insect is known from the type female only. A 

 single larva was found in January 1921 at Catamarca, Argentina, 

 in a small hollow which it had excavated in the stem of Cereus validus. 

 It left the plant to spin a loose cocoon, from which the adult emerged 

 in early March. The wing expanse is 26 mm.; the forewings are dark 

 grey with darker markings, and the hindwings are white. 



