OF WASHINGTON, VOLUME XIX, 1917 37 



genus Phyllocnistis included in a very different family might not 

 be included with Lencanthizd. It is here that we are forced to 

 fall back upon larval characters. Leucanthiza is therefore in- 

 cluded in the Gracilariidae mainly on larval characters. The 

 only suggestion of a family characteristic noted by the writer in 

 this case, is the short vein 8 to the hump, in the hind wings. 



The arrangement of genera which follows is constructed mainly 

 upon venational characters, a few additional hints are however 

 given for those who may wish to use it as a key. 



The writer wishes to express his thanks to Mr. Heinrich for 

 comparing the genitalia of a number of species whose status was 

 in doubt. To Mr. Busck he wishes to gratefully acknowledge 

 his indebtedness for help and advice upon numerous occasions. 

 It is through the latter that there were available a number of 

 named species which had been compared with Chambers' types, 

 as well as notes regarding them. 



KEY TO GENERA. 



1. Hiiuhvings with branch to costa between terminations on cost a 



of 7 and 8 2 



Hindwings without branch to costa between terminations on costa 

 of 7 and 8 3 



2. Forewings, 11 from near base of cell (head smooth. .(Gracilaria (part) 

 Forewings, 11 from about 5 of cell (head rough) Parnrnix 



3. Hindwings, 8 veins (4 weak in Micrurapteryx) 4 



Hindwings, less than 8 veins 9 



4. Forewings, 11 from near base of cell (hind tibiae smooth) 5 



Forewings, 11 from } of cell or beyond ^ (hind tibiae with bristles 



above) 6 



5. Forewings, 6 and 7 separate Gracilaria (part ) 



Forewings, 6 and 7 stalked Micrurapteryx 



6. Forewings, 12 veins (11 veins in onosmodiella) 7 



Forewings, less than 12 veins 8 



7. Forewings, 6 separate (base of antennae with eye&a.p). .Chilosampyla 

 Forewings, 6 stalked, with 5 or with 7 Acrocerc<>/>* 



8. Forewings, 7 stalked with 8, or absent Leucospilapteryx 



Forewings, 7 stalked with 6 Apopftthixix 



9. Hindwings, 7 veins (5 and 6 stalked) 10 



Hindwings, less than 7 veins , 12 



10. Forewings, 11 very near base of cell (10 not toward end of cell). . 11 

 Forewings, 11 from about 3 of cell (10 toward end of cell). .Parcrln/>n 



11. Forewings, 12 veins, 2 and .'> weak (hind tibiae bristles above) 



Neurobathra 

 Forewings, 11 veins, one dorsal branch absent (hind tibiae smooth' 



Gracilarin i part) 



