GEQMETRIDAE. 



165 



5. 



Fore wing with cell-dot enlarged 



Fore wing with cell-dot not enlarged 



6. Rufescent or ochraceous, generally larger 

 Grisescent, at least in ground-colour, not large 



7. Hind wing with termen dentate, bent in middle 

 Hind wing with termen rounded, at most subcrenulate 



8. Hind wing beneath with dark apical patch and enlarged 



cell-spot ....... 



Hind wing beneath not so 



9. Fore wing yellowish, antemedian line vertical posteriorly 

 Fore wing reddish, antemedian line strongly oblique 



posteriorly . 



10. Postmedian line of both wings denticulate 

 Postmedian line of hind wing not denticulate . 



1 1 . Postmedian lines meeting, their denticulation slight 

 Postmedian of hind wing at costa more proximal, denti- 

 culation of postmedian deeper . 



12. Fore wing with blackish apical maculation 

 Fore wing without blackish apical maculation . 



13. Fore wing variegated with reddish subapically 

 Fore wing not variegated with reddish subapically . 



1 4. Fore wing with postmedian line denticulate . 

 Fore wing with postmedian line not denticulate 



15. Fore wing 18 mm. long, with apex produced . 



Fore wing not more than 15 mm., with apex not produced 



16. Grisescent or variegated ...... 



Rufescent or avellaneous . 



17. Fore wing with apex produced, postmedian line single 

 Fore wing with apex not appreciably produced, post- 

 median line duplicated iM'oximally .... 



18. Under side with strong subterminal dark shades, at least 



apically . . . . . . . 



Under side without strong subterminal dark shades 



19. A dark line indicated midway between subterminal and 



termen ........ 



No dark line indicated midway between subterminal and 

 termen . . . . . 



20. Wings subcrenulate, beneath sharply marked . 



Larger, wings smooth-margined, redder, beneath weakly 

 marked ........ 



orbipuncta Prout (1925). 

 6 

 7 

 10 



odontias Prout (1923). 



sp. n., Samoa. 



9 



juventinaria Guenee (1858). 



epopsioneura Prout (1926). 

 11 

 12 



(A) tractata Prout (1916). 



intractata Walker (1862). 

 13 

 14 



(B) inordinata Walker (1862). 

 (B) vigaia Walker (1862). 

 scitilineata Walker (1862). 



15 



dohertyi Prout (1925). 

 comprensata Walker (1862). 



17 



19 



18 



synocha Prout (1923) 



(A) exlractata Prout (1923). 

 (A) irretracta Warren (1899). 



argyrosticha Turner (1919). 



20 



reprensata Prout (1916). 

 extensipennis Prout (1923). 



Note (A). — These three are probably races, in some measure linked up by others not yet 

 named ; N. irretracta is known to occur in the Bismarck Archipelago, and in Gizo and Tulagi 

 (Solomon Is., off Isabel), and the Queensland form would work down to it in our key ; N. extractata 

 represents it in the Louisiade Archipelago, and N. tractata (Rook I.) may be a further race. The 

 new Samoan species is probably developed from this, the most easterly, group. 



Note (B). — I am coming increasingly to think that N. vigaia and N. inordinata are merely 

 forms of a single species. The vigaia forms are most frequently (though not invariably) $, the 

 inordinata forms more often Distribution, according to present determinations, seems 

 in (3) 4 



