APPENDIX. 



The following new species and the information regarding Hende- 

 caneura shawiana came to hand after the revision had gone to press 

 and too late to allow them to be properly incorporated into the body 

 of the manuscript. As names were required for the new forms, it 

 was thought better to give them in an appendix rather than a later 

 separate publication. 



THIODIA SORORIANA, new species. 



(Fig. 421.) 



A unicolorous gray species. Palpi, face, head, thorax, and fore 

 wing very dark grayish fuscous, finely powdered with white, giving 

 the entire insect a uniformly dark ashy gray appearance; bordering 

 termen a narrow straight faint blackish band; termen straight, 

 decidedly slanting; veins 3, 4, and 5 well separated toward termen. 

 Hind wing dark smoky gray; cilia slightly paler with a dark basal 

 band ; veins 3 and 4 stalked. 



Right harpe of male genitalia of type figured. 



Alar expanse. — 17.5-18 mm. 



Type. — In Canadian National Collection. 



Paratype.—Csit. No. 25613 U.S.N.M. 



Type locality. — ^Aweme, Manitoba. 



Food plant. — Unknown. 



Described from male type and paratype from the type locality 

 ("N. Criddle, 24-IX-1921 " and "22-IX-1921"), received through 

 Doctor McDunnough. I have also seen specimens of the same species 

 in the Fernald collection at Amherst, from Ontario, Canada, bear- 

 ing the manuscript name " cinereana Fernald." In the key given 

 it would run down to lapidana Walsingham, from which it can be 

 separated by the dark band bordering termen of fore wing. It 

 most closely resembles Hystricophora (?) kokana Kearfott, but I 

 do not think it can be that species. 



THIODIA NEPOTINANA, new species. 

 (Fig. 422.) 



White heavily dusted with dark gray (or gray dusted with white). 

 Palpi, face and head more white than gray. Fore wing with the 



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