31 



flanged plate on the ventral surface ; antennae, if present, 



pectinate and reaching farther caudad than the proximal 



end of the mesothoracic legs; none of the head sutures 



distinct for the whole length. ^^oioi^tt^t-, * 



COSSOIDEA. 



dd. Body never heavily chitinized, and never bearing the spines 

 or setae on the abdominal segments in rows ; spiracles 

 always visible on the first abdominal segment. 



EUCLEOIDEA. 



cc. True maxillary palpi usually present ; if absent, then the ap- 

 pendages free from each other, or the vertex longer than the 

 prothorax on the meson, or the body possessing a distinct cre- 

 master. 



d. Dorsum of abdomen with a covering of small spines, usually 

 over the entire length of the segment and not arranged in 

 distinct rows ; if spines are arranged in rows then the maxil- 

 lary palpi are absent; vertex always longer than the pro- 

 thorax on the meson. ' GRACILARIOIDEA. 



dd. Dorsum of the abdomen with a distinct row of spines along 

 the cephalic margin of the segment, with or without a 

 caudal row ; spines seldom found elsewhere on the segment 

 but, if present, then the maxillary palpi present and well 

 developed. 



e. Caudal row of spines never present on the dorsum of the 

 abdominal segments ; maxillary palpi always present. 



TINEOIDEA 



ee. Caudal row of spines always present on the dorsum of the 

 abdominal segments; maxillarj^ palpi usually present. 



f. Distinct cremaster never present; setae never present on 

 the anal rise ; wings narrow and pointed ; large spines 

 always present on the venter of the tenth abdominal seg- 



"'^''*- AEGERIOIDEA. 



ff. Distinct cremaster usually present, if not, then setae pres- 

 ent on the anal rise ; wings broad and never pointed ; 

 large spines never present on the venter of the tenth 

 abdominal segn.ent. TORTRICOIDEA. 



bb. iNIovable abdominal segments never present cephalad of the 

 fourth; appendages never free from each other and usually 

 soldered to the body wall. 



