99 



a. Fronto-clypeal suture always distinct for its entire length, sometimes 

 forming a prominent curve or angle at the meson. 

 b. Labial palpi exposed for their entire length, 

 c. Femora of the prothoracic legs visible ; maxillary palpi either 

 reaching the proximo-lateral angles of the maxillae or approach- 

 ing them very closely; tenth abdominal segment with stout 



spines at the caudal end Lavernidae. 



cc. Femora of the prothoracic legs never visible; maxillary palpi 

 minute; tenth abdominal segment with hooked setae at the 



caudal end Scythridae. 



bb. Labial palpi never exposed for their entire length, usually con- 

 cealed, 

 c. Maxillary palpi present and usually reaching the proximo-lateral 

 angles of the maxillae ; antennae usually adjacent on the meson 

 for the caudal two fifths of their length, separating at distal 



ends to show the metathoracic legs Gelechiidae. 



cc. Maxillary palpi never present; antennae adjacent on the meson 

 for the caudal two fifths of their length but not separated at 



their distal ends Chrysopeleiidae. 



aa. Fronto-clypeal suture never distinct for its entire length and never 

 reaching the meson, 

 b. Abdominal segments 4-6 movable, with very deep incisions be- 

 tween the segments on the dorsal and ventral surfaces ; body 

 depressed, 

 c. Maxillary palpi large,, usually reaching the proximo-lateral 

 angles of the maxillae ; hooked setae never present on the ven- 

 tral surface of the ninth abdominal segment Oecophoridae. 



cc. Maxillary palpi minute ; hooked setae always present on the ven- 

 tral surface of the ninth abdominal segment Stenomidae. 



bb. Abdominal segments 4-6 never all movable ; incisions between 

 the segments of equal depth on all surfaces ; body not depressed, 

 c. Maxillary palpi present; sixth abdominal segment movable. 



COSMOPTERYGIDAE. 



cc. Maxillary palpi absent ; no abdominal segments movable. 



Elachistidae. 



Family Lavernidae 



The pupae belonging to this family are more generalized than any 

 other members of the superfamily and closely resemble pupae belong- 

 ing to the family Yponomeutidae. They have been included here on 

 account of the distinct fronto-clypeal suture, present in all except the 

 more specialized Gelechioidea, and also because the prothorax, which 

 is so short on the meson in Yponomeutidae with each half triangular 

 in outline, in this family loses that condition and becomes almost as 

 long on the meson as at the lateral margins, so that each half is sub- 



