382 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



specific differences are noted from this character. A complete revision 

 of the genus Gonioterma is planned, but the present study at least will 

 permit recognition of the included species. 



Because, in some instances, characters used to distinguish the fe- 

 males involve differences in size, the illustrations of the female genitalia 

 were all drawn to the same magnification. Mr. Andre Pizzini made 

 the illustrations for this paper. 



Gonioterma exquisita, new species 



Figures la, 6; 2a, e 



Alar expanse 21-23 mm. 



Antenna whitish sprinlded with brown basally, whitish annulated 

 with brown beyond. Head white medially with transverse band of 

 gray between bases of antennae; second segment of palpus white, 

 shaded with brown on outer side, white on inner side. Legs whitish 

 ocherous; forelegs heavily shaded with fuscous, mid- and hindlegs 

 lightly shaded with brown. Tegula and dorsoanterior portion of 

 thorax white, shaded with gray, posterior portion of thorax gray. 

 Abdomen ocherous. Forewing white; base of costa narrowly fuscous; 

 three triangular fuscous costal spots, one at basal third, one near 

 middle, one at apical fourth; from outer corner of apical spot a row of 

 fuscous dots extends from apex along termen to tornus; black spot at 

 base of cell from which a wide band of olivaceous brown extends to 

 inner angle; from apex of middle costal spot an irregular patch of gray 

 extends transversely around basal spot to inner margin; crescent- 

 shaped olivaceous brown spot at end of cell; irregular patch of gray, 

 shaded with olivaceous brown, extends from tornus to apex of apical 

 costal spot; cilia fuscous basally, white beyond. Hindwing light gray 

 with whitish costal margin in males, heavily shaded with fuscous in 

 females; cilia white with gray subbasal line. 



Male genitaha: See figures la,h (shde WDD 2502, paratype). 

 Uncus reduced, curved ventrad; gnathos complete, basal process well 

 developed, rather long, recurved; division of gnathal arms at base 

 of process; tegumen moderately constricted; harpe broad, saccular 

 lobe rather narrow, bluntly pointed; anellar lobes broad, bluntly 

 rounded at apex; aedeagus short, broad, vesica armed with two 

 elongate, convoluted clusters of small, heavy cornuti. 



Female genitaha: See figure 2a (slide WDD 2503, paratype). 

 Genital plate membranous; ostium small, ostium bursae enlarged; 

 ductus bursae short, less than half length of corpus bursae, which has 

 two dentate signa; anterior margin of eighth abdominal tergum with 

 rectangular indentation. 



Type: Brazil, Lassance, Minas Geraes, Nov. 9-12, 1919, USNM 

 66418. 



