368 PROCEEDINGS OF THE NATIONAL MUSEUM vol.86 



9. Genus YOSEMITIA Ragonot 



Yosetnitia Ragonot, Memoires siir les Lepidopteres, vol. 8, p. 17, 1901. (Geno- 

 type: Spennatopthora graciella Hiilst.) 



Yosemetia Hulst, U. S. Nat. Mus. Bull. 52, p. 429, 1903. — Dyar, Insecutor Insei- 

 tiae Menstruus, vol. 13, p. 220, 1925. (Misspelling for Yosemitia.) 



Antemia of male weakly serrate and pubescent, of female simple 

 and shortly pubescent. Labial palpi obliquely porrect. Maxillary 

 palpus fan-shaped and held vertically to the face. Hind wing with 

 veins 7 and 8 anastomosing beyond cell; veins 3 and 5 stalkeu. 

 Eighth abdominal segment of male simple. 



Male genitalia with apical process of gnathos bifid; harpe with 

 apex evenly rounded; vinculum moderately long; anellus with arms 

 broad, short, slightly twisted, and base of plate broadly sclerotized ; 

 aedeagus short and slender, sclerotized throughout. 



Female genitalia with signum developed as a small, shortly spined 

 plate; ductus biirsae short; bursa copulatrix finely scobinate, espe- 

 cially in area about signum; ductus seminalis from bursa near junc- 

 tion of bursa and ductus bursae. 



Larva bluish, dark, not banded or conspicuously spotted. 



The larvae feed gregariously (sometimes singly) in Echinocereus, 

 Coryphantha^ Ilomnlocephuhi, and presumably also in Echinocactvs 

 and N eomamillaria. 



Eggs laid singly. 



Remarks. — This genus as here defined is distinguished by the fol- 

 lowing combination of characters: Male antenna serrate and pubes- 

 cent; labial palpi porrect in both sexes; maxillary palpi fan-shaped; 

 male genitalia with vinculmn moderately long and rather narrow, 

 apical process of gnathos bifid, anellus small and stout with broad 

 short arms, aedeagus slender; eighth abdominal segment of male 

 simple; female genitalia with signum a small, shortly spined plate, 

 ductus bursae short and ductus seminalis from bursa copulatrix near 

 junction of bui'sa and ductus bursae; larvae not banded and normally 

 gregarious. 



The male genitalia have a characteristic habitus which makes them 

 easy to place generically; but the differences between species are very 

 slight and not altogether trustworthy, hardly more than might be 

 expected within specific limits. 



Four species are recognized as belonging to the genus. Its distri- 

 bution is the southwestern part of the United States and Mexico. 



KEY TO THE SPECIES OF YOSEMITIA 



1. A short blackish line on midcosta of fore wing 4. didactica Dyar 



No such line on midcosta of fore wing 2 



2. Subterminal line of fore wing interrupted between veins 6 and 5. 



1. graciella (Hulst) 



