THE CACTUS-FEEDING PHYCITINAE — HEINRICH 361 



Distribution. — ^Argentina : Tucuman, Tapia, Mendoza, Catamarca, 

 Andalgala. 



Twelve specimens examined. 



Remarks. — Concerning hosts, Mr. Dodd supplies the following 

 note: "The food plants of G actohlastis hucyrus in Tucuman are 

 TricJiocereus terschechii (Parmentier) and Echinopsis shaferi Brit- 

 ton and Rose ; Stetsonia is not a known host plant. Dyar described 

 this insect from material reared by W. B. Alexander from Echino- 

 Goctus (?) at Mendoza and from Echinopsis at Andalgala. The 

 ''Echinocactus'' from Mendoza is undoubtedly Denmoza rhodacantha 

 (Salm-Dyck). The Echinopsis from Andalgala is probably E. tubi- 

 flora (Pfeiffer)." 



7. CAHELA, new genus 



Genotype. — Olyca ponderosella Barnes and McDunnough. 



Antennae of male and female pubescent, the pubescence shorter in 

 the female. Labial palpus of male obliquely upturned, of female 

 porrect, with third segment downcurved and second and third seg- 

 ments longer than those of male; male palpus not extending above 

 middle of front and with third segment short. Maxillary palpus 

 squamous. Hind wing with veins 7 and 8 shortly anastomosing be- 

 yond cell; 3 and 5 stalked. Eighth abdominal segment of male 

 simple. 



Male genitalia with apical process of gnathos fused; harpe with 

 apex evenly rounded; vinculum short; anellus with base of plate 

 narrowly sclerotized, arms long and broad, slightly twisted ; aedeagus 

 stout, sclerotized throughout. 



Female genitalia with signum developed as a ridged plate (a hol- 

 low, blunt, flattened, more or less thornlike projection into the bursa) ; 

 bursa copulatrix large, finely scobinate especially in the neighbor- 

 hood of the signum; ductus bursae scobinate at genital opening; 

 ductus seminalis from bursa near signum. 



Larvae whitish, not banded or conspicuously spotted; solitary in 

 habit ; stem borers in Cylindropuntias. 



Eggs laid singly. 



Remarks. — This genus and the following {Rumatha) are dis- 

 tinguished from all others in the cactus-feeding group by the com- 

 plete fusion of the apical process of the gnathos. Several male char- 

 acters distinguish the two genera from each other, but Cahela is most 

 easily recognized by the black longitudinal lines between the veins 

 on the fore wing. 



The genus is apparently limited in distribution to the southwestern 

 part of the United States and northern Mexico. 



