38 U.S. NATIONAL MUSEUM BULLETIN 280 



are three-branched rather than two-branched, the medial band of the 

 uncus has a central pentagonal process, and the juxta bears a pair of 

 lateral knobs, each with a small cluster of setae. 



Description. — Labial palpi porrect, about 3% times as long as eye 

 diameter; maxillary palpi moderate, not reaching frons; male antennae 

 with basal segments of shaft fused, shaft serrate and fasciculate, female 

 unknown; oceUi well developed. 



Forewing with 11 veins; Ri from cell relatively near to R2+4; R2 

 relatively long stalked with R3+4; M2+3 stalked for about one-half 

 their length or less; Cui from near M2+3. Hindwing with 7 veins; 

 Sc and Rs stalked for abovit one-half their length; M3 and Cui stalked 

 for about one-third their length. 



Male genitalia with medial band of uncus very broadly rounded, 

 bearing a well-developed, ventraUy directed, apical, pentagonal 

 process; spicate processes three-branched. Gnathos broad, flat, thin, 

 broadened at base; sharp pointed apicaUy, but without special process. 

 Juxta V-shaped, bearing pair of setose knobs. Vinculum subquadrate, 

 anterior corners weU rounded. Valvae relatively slender; costa sparsely 

 setose, with smaU apical tooth at tip of valve; sacculus densely 

 pubescent. Aedeagus with vesica unarmed. 



Female unknown. 



Discussion. — The genus is apparently closely related to Peoria, 

 but differences in the male genitalia are too great to allow inclusion 

 of the one species in that genus. 



Anacostia trihulella, new species 



Figures 25, 83, 118 



Diagnosis. — This is the only known species in the genus. 



Description. — Labial palpi with all segments dark brown to 

 black; antennae brown, shaft with tuft of black scales on basal seg- 

 ments; head and thorax black; legs black on outer sides, brown 

 on inner sides; abdomen dorsally brown, becoming golden brown 

 anteriorly, ventrally black. 



Forewing ground dark brown to black; area anterior to cell white 

 sprinkled mth black scales; discal spot, transverse anterior, transverse 

 posterior, and subterminal lines black, not conspicuous against 

 ground. Hindwing broAvn, darker toward apex; terminal line white, 

 brown bordered on both sides. 



Genitalia as described for the genus. 



Types. — In the Academy of Natural Sciences (holotype); in the 

 Cornell University collection (two paratypes). 



Type data.- — Holotype, male, Holland Va. (Nansemond Co.), 

 Aug. 1, 1945, O. Buchholz; A.N.S. Type No. 7817; genitalia slide 

 No. 595, J. Shaffer, Apr. 24, 1966. 



