70 Mv. F. W. Edwards on the Oil-World 



probable that these represent most, if not all, of the main 

 groups of the genus, although more than a score of them 

 are unfortunately represented by females only. 



I wish to express my thanks and indebtedness to my 

 friends Dr. C. P. Alexander, Mr. E. Bruuetti, and Herr M. P. 

 Riedel for the loan or presentation of several types and other 

 specimens. 



Key to Old-World Species of Eriocera (sens. lat.). 

 (Those marked * have not been seen by the author.) 



1. Rs at least twice as long as R; II3 up- 



turned and ending well before the tip 

 of the wing ; Cuj widely divergent from 

 M3, and forming an angle with the 

 lower margin of the discal cell ; wings 

 elaborately streaked with dark. (Su- 

 matra, Borneo.) ornata (End.). 



Rs less tban twice as long as R, usually 

 much less (but compare ohsvuripennis, 

 Edw.) ; R3 not upturned at tip and 

 ending close to the tip of the wing ; 

 Cui parallel with M3, and almost in a 

 straight line with the lower margin of 

 tlie discal cell ; wings not conspicuously 

 streaked with dark 2. 



2. Cross-vein /• placed about the middle of 



R2+.3, which is much longer than R,. 



(Seychelles.) luttipennis (Edw.). 



Cross-vein r placed much beyond the 

 middle of R2+3, usually beyond it on 

 Rj o. 



3. Sc ending opposite or before the apex of 



Rs ; Ax straight, or convex towards An. 4. 

 Sc ending at least slightly beyond the 

 apex of Rs; Ax longer and more or 

 less concave towards An 10. 



4. R2+3 almost as long as, or even longer 



than, R2 ; wing-membrane brownish 

 with dense microtrichia (normal) ; Ax 

 noticeably convex towards An ; small 



reddish species. (Seychelles.) 5. 



R24-3 much shorter than R2 ; wing-mem- 

 brane hyaline, the microtrichia abnor- 

 mally sparse ; Ax practically straight. 

 (Ceylon.) 7. 



5. Wing-membrane towards tip with dis- 



tinct macrotrichia ohscnn'pentiis, Edw. 



Wing-membrane without macrotrichia. . 6. 



6. Wings with pale streaks in the cells ; 



four posterior cells fuscineiris, Edw. 



AVing uniformly brownish ; three pos- 

 terior cells ferruf/inea (Edw.). 



