LEPIDOPTEROUS LARVAE— FR ACKER S3 



o. Abdomen with rho of segment 8 cau- 

 dodorsad of spiracle, alpha and beta 

 remote. BLASTOBASIDAE* 



oo. 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. Adfrontals 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 mucli closer together than 



setae alpha; prolegs long and slender. 



HEMEROPHILIDAE 

 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 me ta thorax bisetose (Fig. 50). 

 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. 



