REVISION OF THE OECOPHORIDAE — CLARKE 137 



fuscous, lighter basally; cilia fuscous. Legs blackish fuscous irro- 

 rated with ochreous-white ; tarsi annulated with ochreous-white. 

 Abdomen fuscous above; beneath, ochreous-white overlaid and irro- 

 rated with fuscous. 



Male genitalia. — Harpe moderately sclerotized; cucullus rounded 

 and clothed with fine hairs. Transverse and longitudinal arms of 

 clasper of about equal length, the former extending beyond the costa ; 

 sacculus as broad as one-third the width of harpe at base. Anellus 

 a roughly rectangular sclerotized plate emarginate on the posterior 

 edge; lateral lobes minute. Transtilla a narrow band with fused 

 hairy lobes. Vinculum rounded, broad. Aedeagus slender, about 

 one-half the length of harpe, slightly curved, unarmed ; apex slightly 

 recurved. Gnathos an oval spined knob ; supporting arms moderately 

 sclerotized. Socii small, clothed with few hairs; widely separated. 

 Tegumen truncated, slightly emarginate. 



Female genitalia. — Ostium large, rounded; on each side of the 

 ostium the genital plate is produced into a strongly sclerotized pocket. 

 Inception of the ductus seminalis slightly anterior to the sclerotized 

 pockets. Ductus bursae membranous, unarmed on inner surface, 

 tapering gradually into the symmetrical bursa copulatrix. Signum 

 an elongate scobinate plate attenuated and broken posteriorly. 



The abdominal wall of this species differs from that of sphaeralceae 

 in being much less strongly sclerotized. The harpes of the male are 

 broader and correspondingly shorter, and much less sclerotized. The 

 aedeagus is shorter than that of sphaeralceae and the apex is more 

 strongly recurved. The female genitalia show marked differences. 

 The signum of sphaeralceae is smaller and less strongly sclerotized 

 than that of thoracefasciella and the sclerotized pockets of the latter 

 species are totally wanting in the former. 



Alar expanse, 15-17 mm. 



Type. — In the Museum of Comparative Zoology, Cambridge, Mass. 



Type locality. — Behrens, Calif. 



Food plants. — Siclahea malvaeflora A. Gray (Keifer rearing) and 

 Malvaf (C. M. Dammers). 



Distrihution. — Southwestern United States. 



United States records 



Arizona: Hualapi Mountains, Mojave County, 2 $ $, 9 (May 24-31, no col- 

 lector). 



California: Diamond Spring, Eldorado County, 3 $ $, 3 5 9 (V-26 to V-3-35, 

 H. H. Keifer) ; Canyon Valley, San Bernardino County, $ (VII-1-32, no 

 collector) ; Riverside, 9 (June 1930, C. M. Dammers) ; Mill Valley, Marin 

 County, 4 $ $ (5-12-III-20, E. P. Van Duzee). 



Reinarks. — I have examined the type of this species and have made 

 a slide of the male genitalia. These agree exactly with specimens 

 from our reared series. 



