5.^1 LEPIDOPTEROUS LARVAE — FRACKER 53 



o. Abdomen with rho of segment 8 cau- 

 dodorsad of spiracle, alpha and beta 

 remote. BLASTOBASIDAE* ^ 



00. Abdomen with rho of segment 8 dor- 

 sad or cephalodorsad of spiracle, 

 p. Alpha and beta of abdomen ad- 

 jacent. (Schreckensteinia). 



YPONOMEUTIDAE 

 pp. Alpha and beta of abdomen re- 

 mote. HEMEROPHILIDAE 

 mm. Adf rontals reaching about two thirds, 

 front less than half, the distance to ver- 

 tical triangle; front blunt at apex; head 

 depressed, held horizontally. 



STENOMIDAE 

 dd. Crochets arranged in a pseudocircle (Fig. 97) or mesoseries 

 (Figs. 100, 105). 

 e. Prothorax with Kappa group trisetose, and with epsilon be- 

 low alpha and gamma, not near rho (Fig. 35). 

 f . Kappa and eta of abdomen remote ; crochets uniordinal, 

 sometimes arranged in a pseudocircle. 



YPONOMEUTIDAE 

 ff. Kappa and eta of abdomen adjacent ; crochets arranged in 

 a mesoseries. 

 g. Setae beta of prothorax about as far apart as setae 



alpha ; prolegs usually short. ETHMIIDAE ^ 



gg. Setae beta of prothorax very much closer together than 



setae alpha ; prolegs long and slender. d ' ^ ' i i- 



HEMEROPHILIDAE ^ru/^J'^m>i^ 

 ee. Prothorax with Kappa group bisetose, and with epsilon asso- 

 ciated with rho between delta and spiracle (Fig. 21) ; kappa 

 and eta of abdomen remote; crochets arranged in a meso- 

 series, usually uniordinal. 

 f. Pi group on mesothorax and metathorax bisetose (Fig. 50). 

 r^ g. Setae small, borne on minute papillae. THYATIRIDAE 

 ^ gg. Setae well developed, borne on chalazae. 

 ^ h. Chalazae rho of abdominal segments bisetose. 



LITHOSIIDAE 

 hh. Chalazae rho of abdomen unisetose (Utetheisa). 



ARCTIIDAE 



♦Characters separating this and the two preceding families not constant. 



