46 BULLETIN 123, UNITED STATES NATIONAL MUSEUM. 



ocellus a pure white patch containing two longitudinal blackish fus- 

 cous streaks well separated and sometimes rather poorly defined; 

 cilia heavily dusted with fuscous. Hind wing with veins 3 and 4 

 stalked ; smoke color, somewhat darker towards apex ; cilia concolor- 

 ous with a darker basal band, extreme tips of hairs white. 



Male genitalia of type figured. 



Alar expanse. — 17-19 mm. 



Type. — In collection Barnes. 



Paratypes. — Cat. No. 24789, U.S.N.M. Also in American Museum, 

 and collection Barnes. 



Type locality. — Deer Park Springs, Lake Tahoe, California. 



Food plant. — Unknown. 



Described from male type and seven male paratypes from Doctor 

 Barnes' collection, all labeled " Deer Park Springs, Lake Tahoe, 

 California." Five of the specimens including the type bear a second 

 label, " July 1-7-" Two are labeled " July 8-15." The seventh bears 

 no date. 



This species can be recognized at once by its striking genitalia, 

 quite different from anything else in the genus or subfamily except 

 delphinoides. The latter, however, has quite another wing pattern 

 and its genitalia are sufficiently different to prevent confusion of the 

 two species. 



20. THIODIA CRISP ANA (Clemens). 

 (Fig. 101.) 



Steganoptycha cHspana Clemens, Proc. Ent. Soc. Phila., vol. 5, 1865, p. 137. 

 Epinotia crispana Feenald, in Dyar List N. Amer. Lepid., no. 5227, 1903. 

 Enarmonia crispana Baenes and McDunnotjgh, Check List Lepid. Bor. Amer., 

 no. 7152, 1917. 



Male genitalia figured from specimen in National Collection from 

 Pemberton, New Jersey ("8-25-14, H. B. Scammell"). 



Distribution according to specimens in 'National Collection, Ameri- 

 can Museum and collection Barnes : Missouri, District of Columbia, 

 New Jersey, Pennsylvania, New York, Ohio, Illinois. 



Alar expanse. — 11.5-13.5 mm. 



Type. — In Academy Natural Science, Philadelphia. 



Type locality. — Virginia ? 



Food plant. — Unknown. 



21. THIODIA ALTERANA, new species. 



(Fig. 102.) 



Very close to crispana Clemens and probably included under that 

 name in most collections. Superficially it can be differentiated only 

 by the more diffused central white dorsal spot on the fore wing. In 

 crispana this spot is separated from the white ocelloid patch by con- 



