GEOMETRIDAE. 



161 



armature (Text-fig. 2, B). Fovea of $ smaller, formed as in C. decisaria Walker, 

 i.e. on the upper side with a small circular ridge in posterior half (adjoining SM 2 ) 

 enclosing a rosette of fine and small, sharply black scales, which radiate from 

 a white centre. Fore iving relatively 

 a trifle broader, with the termen ap- 

 preciably less oblique ; much less 

 brown and more weakly marked than 

 in most specimens of C. samoana, of 

 a more dead white than the whitest 

 aberrations thereof, without fuscous or 

 blackish irroration, in both sexes al- 

 together recalling weakly marked C. 

 decisaria, though slightly more tinged 

 with brown ; cell-mark only narrowly 

 dark-shaded proximally and distally ; 

 postmedian line more regularly crenu- 

 late throughout, and without the pro- 

 nounced loop outward at the radials, 

 in this again rather closely resembling 

 C. decisaria ; § with a conspicuous 

 black dot in the position of the 



specialised patch of the $ fovea (as in some C. decisaria Hind wing 



similarly pale and weakly marked, with large raised white scales in end of 

 cell and again beyond, much as in C. decisaria ; a small black cell-dot, not 

 developed into the usual ocellus of the genus. Under side dirty whitish, with 

 the cell-spot of the fore wing rather smaller than in C. samoana, that of the 

 hind wing small and weak, the postmedian of both wings little sinuous, weak 

 posteriorly, the subterminal dark shades narrow, weak except anteriorly (a 

 little stronger in the than in the 



Upolu : 2 £3, in Zool. Mus. Berlin (Friedlander) ; Apia, 1 16.V.1923 

 (Armstrong) ; type 14.V.1924 (Armstrong) ; 1 o, 24.V.1924 ; 1 3 (valva 

 figured), 27.viii.1924 ; allotype $, 12.X.1922 (Armstrong) ; 1 $, l.xi.1924. 



Savaii : Palauli, 8.viii.l924. 



Apart from the very different armature of the valva (harpe of Pierce, Genit. 

 Geometr., etc., 1914), I should have regarded this as a race of C. decisaria Walker. 

 A figure of the valva of a Kei Is. C. decisaria is given for comparison. The 



Text-fig. 2. — Yalvae of males of Chora decisaria 

 from Key Islands (A) ; C. hemiopa from 

 Upolu, Samoa (B). Drawn by W. H. T. 

 Tarns. 



