REVISION OF THE OECOPHORIDAE — CLARKE 183 



gray tipped. Thorax and tegula blackish fuscous anteriorly, drab 

 posteriorly. Fore wing blackish fuscous irrorated with drab and 

 olive-buff scales; wing, at exti-eme base in angle, three short dashes 

 at basal third, the bases of veins 9, 10, and 11, and a series of small 

 spots at the ends of all veins around termen, black; at end of cell a 

 well-defined olive-buff spot preceded by a few black scales ; at apical 

 third a poorly defined, narrow, outwardly curved olive-buff fascia; 

 extreme edge of costa f aintlj^ pink ; cilia grayish fuscous. Hind wing 

 light fuscous, darker apically; cilia very light shining fuscous with 

 a darker subbasal line. Legs fuscous strongly overlaid with olive- 

 buff ; tarsi annulated with olive-buff. Abdomen fuscous, the posterior 

 edges of the segments dorsally grayish ; under surface heavily over- 

 laid with olive-buff. 



Male genitalia. — Harpe broad, sparsely clothed with hairs; clasper 

 stout, abruptly excurved just below middle; at base of clasper a 

 series of four or five short, stout bristles; sacculus narrowly folded 

 but strongly sclerotized; from base of sacculus an elongate, gently 

 excurved process armed with fine, slender spines. Anellus a broad 

 sclerotized plate broader than long; posterior edge narrowly pro- 

 duced to middle and deeply cleft. Aedeagus longer than harpe, 

 slender, evenly curved ; at base a broad, flat dorsal winglike expan- 

 sion; opposite this a broad concave plate by which the aedeagus 

 articulates with the anellus. Vinculum rounded with prominent 

 ventroposterior ridge. Transtilla membranous with large, hairy, 

 broad lateral lobes. Gnathos a spined, oval knob. Socii minute, 

 mainly indicated by a few hairs. 



Female genitalia. — Genital plate narrow, of nearly equal width 

 throughout; ventroanterior edge produced into a narrow flap. 

 Ostium small, somewhat triangular. Ductus bursae membranous ex- 

 cept for a small, strongly sclerotized, curved section from middle to 

 posterior three-fourths ; entire posterior half rigid and slightly curved ; 

 inception of ductus seminalis just before ostium. Bursa copulatrix 

 large; signum a large, sclerotized, toothed plate with prominent 

 anterior and posterior points. 



Alar expanse, 18-22 mm. 



7V/^c.— U.S.N.M. No. 52083. 



Type locality. — Snake River, Whitman County, Wash., opposite 

 Clarkston. 



Food plant. — Lotnatium macrocarpum (Hook, and Am.) Coult. 

 and Rose. 



Remarks. — Described from the $ type, 2 $ and 1 $ paratypes 

 all from the same locality. These specimens were reared from larvae 

 which I collected. The moths issued 26-27-V-1935. 



