59] LEPIDOPTEROUS LARVAE— FRACKER 59 



kk. Scoli never present on head or body; fleshy 

 filaments never present. 



I. Suranal plate bifurcate at tip, bearing two 



distinct processes (Fig. 84). 



AGAPETIDAE 



II. Suranal plate rounded, entire. 



m. Crochets in a pseudocircle (Fig. 97) ; se- 

 tae never borne on chalazae ; head small. 

 LIBYTHEIDAE 

 mm. Crochets in a mesoseries. 



n. Head conspicuously larger than protho- 

 rax. NYMPHALIDAE 



nn. Head not larger than prothorax ; setae 

 usually borne on chalazae. 



PIERIDAE 



jj. Osmaterium present on prothorax; when retracted, 



presence shown by dorsal groove through which 



it is everted. 



k. Setae minute, never borne on verrucae except in 



early instars. PAPILIONIDAE 



kk. Setae well developed; some verrucae present. 



PARNASSIIDAE 



