Figures \10-U7—Marilia gracilis Bks: 110, genitalia, lateral; 111, clasper, posterior. 

 M. gracilis nigrescens Bks.: 112, clasper, posterior. M. scudderi Bks.: 113, genitalia, 

 lateral; 114, clasper, posterior. M. wrighti Bks.: 115, genitalia, lateral; 116, clasper, 

 posterior. M. modesta Bks.: 117, genitalia, lateral; 118, clasper, posterior. M.fasiculata 

 Bks.: 119, genitalia, lateral. M. mexicana (Bks.): 120, female genitalia, ventral; 121, 

 bursa copulatrix, lateral. Helicopsyche hageni Bks.: 122, genitalia, lateral; 123, clasper, 

 posterior. Lepidostoma frontalis (Bks.): 124, genitalia, lateral; 125, clasper, ventral. 

 L. mexicana (Bks.): 126, female genitalia, lateral; 127, female genitalia, ventral. 



U.S. GOVE3NMENT PRINTING OFFICE: 1967 



