FAM. TORTRICID^: 3 



and its actual position therefore indefiuite. I have nevertheless employed all these characters, for the 

 sutticient reason that lliere are no bttter ones; they indicate genera which are found to be superficially, 

 phylogenetically, and geographically natural, and in practice there is seldom much difftculty in referring 

 even a single speciinen to its proper genus. Their unavoidable vaguencss must however be borne in 

 mind, and several specimens of a species should be examined wherever possible, in order to ascertain 

 the true characters. Genera separated with mathematical precision by absolute characters would be very 

 convenient, but a knowledge of extensive material shows that in nature they commonly do not exist; it 

 must suffice that the genera are based in all instances on definable structural chaiacters. and that the 

 species assigned to them exhibit a general though not an absolute ccmformity. 



Many species of Tortricitia possess a costal fold in the male sex, the basal portion of the costa of 

 foiewings being inoi e or less mai kedly folded over on the upper sui face and commonly including a more 

 or iess developed tuft of Iiaiis; this has frequently been used for generic delimitation, but I do not now 

 employ it for this purpose, not because it is a sexual character. but because I do not find it gives natural 

 or reliable results, since it frequently sepaiates species which are otherwise closely allied, and also occuis 

 sometimes in so slight a form that it is practically impossible to decide positively whether it is present or 

 absent. There aie however manv genera in which it is never found. As a general principle tufts of hair 

 in the male sex (frequent in the Toriricina in various positions) are essentially specific in character and 

 not generic. 



I record 80 geneia and io3i species. 



KEY TO THE GENERA 



1. Head sinoolh-scaled 2. 



— Head nut smootli-scalsd 7. 



2. Forewings ivitk 3 from aiigle 3. 



— Forewings tvith 3 from mucli hefore angle 23. Genus Chresmarcha, Meyrick. 



3. Forewings tiiilh ^ and 8 stalked 25. Genus Atteria. Walker. 



— Forewings with 7 aiid 8 separate \. 



4. Forewiiigs with 7 to costa 21. Genus Cerace, Walker. 



— Forewiiigs with j to apex or iermeii 5. 



5. Hindwings tidth 6 and y stalked 24. Genus Zacorisca, Meyrick. 



— Hindwiiigs with 6 and 7 approximaied 6. 



6. Palpi moderately lung 22. Genus Megalodoris. Meyrick. 



— Palpi very loiig 26. Genus Pseudatteria, Walsingham. 



7. Forewings with 4 ahseiit 34. Genus Eurythecta. Meyrick. 



— Forewiiigs witli 4 present .... S. 



8. Hindwings with basal pecten on cell g. 



— Hindwiiigs withoiit hasal pecten on cell i3. 



g. Forewings wiih ^ and 8 separate 42. (jenus C"tenopseustis, Meyrick. 



— Forewings with ~ and 8 stalked or coincideni 10. 



10. Thorax with Iriplecrest 41. Genus Ei'ai,xiphora, Meyrick. 



— Thorax wiihout crest • .11. 



11. Tongtie absent 71. (}enus Svnnoma, VValsingham. 



— Tongue present i.;. 



12. Forewings iu (j' ivith 7 ahseiit 72. Geniis .Amorhia, Clemens 



— Fortwings in ^T ?''''/' ~ present 73. (ienus Sparganothis, Hiibner. 



