46 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iie 



dorsally except tegulae, which are lemon yellow. Abdomen brown 

 with patches of white scales laterally. Forewing deep brown, with 

 lemon yellow triangular area, continuous with yellow tegula, occupying 

 basal third except short costal lenticular spot and longer, narrower 

 spot along posterior wing margin, both spots concolorous with ground 

 color. Apical two-thirds of forewing with inconspicuous area of white 

 scales near midlength of costal margin and similar, smaller area 

 slightly more distad; broad transverse band, parallel to distal margin 

 of yellow spot, small group of scales behind more basal white area, 

 short curved band extending caudolaterad from more distal white 

 area, submarginal longer straight band parallel to outer wing margin, 

 iridescent blue. Cilia blackish brown. Hindwing dark brown with 

 patch of white on basal half of anterior margin ; cilia brown edged in 

 white. 



Male genitalia: Uncus pointed; gnathos a simple band; harpes 

 simple with palmate multilobed hairs on outer part of costa; vinculum 

 narrow, incomplete in front, anellus with two flattened, upright lobes; 

 aedeagus large with apex pointed; cornuti a large cluster of small 

 spines and one large single spine. 



Female genitalia: Genital plate membranous; ostium bursae large, 

 trumpet-shaped; ductus bursae membranous; corpus bursae with 

 signum large, dentate; inception of ductus seminalis near ostium. 



Type : In the Museum of Comparative Zoology, Harvard University. 



Type locality: Texas. 



Food plant: Quercus sp. According to Forbes (1923), the larva 

 is found in a nest about two centimeters in diameter, formed by an 

 oval wall of silk between two sUghtly separated oak leaves, and it 

 feeds on the lower parenchyma only. 



Distribution: Massachusetts: Martha's Vineyard, new jersey: 

 Lacy (July). Maryland: Annapohs (Aug.). district of Columbia: 

 Washington (July), north Carolina: Southern Pines (Aug.). 

 Georgia: Spring Creek (July). Florida: Enterprise (April); Lake- 

 land (May). Illinois: no locality. Missouri: no locality (May). 



This species is very closely related to S. Jernalddla Riley, but it 

 is distinguished readily by its single large spine and by a cluster of 

 small spines in the aedeagus of the male, and by its heavily sclero- 

 tized, dentate signum in the corpus bursae of the female. 



2. Setiostonia fernaldella Riley 



Figures 19, 19a, 42; Plate 4a; Map 9 



Setiostonia fernaldella Riley, 1889, Proc. Ent. Soc. Washington, vol. 1, p. 155. — 

 Busck, 1934, in Lepidopterum catalogus, vol. 67, p. 1. 



Alar expanse 12-13 mm. 



Color: Face yellow sprinkled with brown; palpus yellow. Legs 



