CACTUS-FEEDENG INSECTS AND MITES 55 



The distribution is given as Arizona — Douglas (June, August) 

 Redington, Palmerlee, Paradise (Cochise County; July, September) 

 Pinal Mts. (April), Baboquivari Mts. (June, July, August, September), 

 Santa Catalina Mts. (August), and "Southern Arizona" (April); and 

 Texas — Presidio (August). 



YOSEMITIA Ragonot 



Of the four species included by Heinrich in this genus, Tosemitia field- 

 iella (Dyar) from Arizona and California and T. didactica (Dyar) from 

 southern Mexico are known in the adult stage only. 



Yosemitia graciella (Hulst) 



Heinrich records this species from many places in Arizona and from 

 a few localities in California, Nevada, Colorado, New Mexico, and 

 Texas, tlie adults having been collected or reared in every month 

 from March to July. He lists as host plants Echinocereus viridiflorus, E, 

 polyacanthus, and Coryphantha aggregaia. 



During the investigations infestation was found in southern Arizona 

 only, where, at Roosevelt and in the Baboquivari Mountains, larvae 

 occurred singly or in small numbers in the fruit and segments of 

 Echinocereus polyacanthus. Adults emerged in late June and early July. 

 The moths, larvae, and cocoons were very similar to those of T. 

 longipennella. 



Yosemitia longipennella (Hulst) 



During the investigations, this insect was not found elsewhere than 

 in the general vicinity of Uvalde, Texas. Heinrich gives several local- 

 ities in southern Texas from Van Horn in the west to San Benito 

 near, Brownsville, the moths being captured in April, May, and June. 

 At Uvalde the dark dull-blue larvae attacked Homalocephala texensis, 

 Hamatocactus setispinus, and Neomamillaria heyderi, all of which are rather 

 small, more-or-less globular plants; the first-named appeared to be 

 the preferred host. Eggs are laid singly on the underside of the flattened 

 spines of H. texensis^ and the young larvae enter the crown of the plant. 

 As many as 75 larvae were recorded in one globular head of this 

 species. They pupate beneath the plant or in adjacent debris, forming 

 rather flimsy cocoons which resemble those of Ozatnia in texture and 

 in the presence of pink "air bubbles" in the outer layers of silk. Emer- 

 gence seems to be prolonged over a considerable period; from several 

 infested plants of H. texensis collected in May, moths emerged from 

 the end of June to the middle of September. The adults often remain 

 in coition through the day. The forewings are brown-grey with black 



