20 D. S. FLETCHER 



With so wide a range of colour and pattern, the best diagnostic characters are 

 to be found in the genitalia ; in the male the shape of the arm of the sacculus and 

 in the female the form of the sterigma and the proportions of the bursa copulatrix are 

 distinctive. 



Distribution (Map i). Comoro Islands ; endemic. 



Material examined. Holotype $ : Gr.-Comoro (Voeltzkow S.), in Zoological 

 Museum, Berlin. 



Grande Comoro : 26.ix.19n (G. F. Leigh), 1 <$ ; ibid., ix.1921, 2 $ ; ibid., 

 x.1921, 2 $ ; ibid., xi.1921, 1 <$ ; ibid., bred, i.viii.1921, 1 <$ ; Grande Comore 

 (L. Humblot), 70 <$, 70 $. Mayotte : 1-5.V.1911 (G. F. Leigh), 1 <J ; ibid., 27-31. 

 v.1911, 1 $. 



Cleora betularia (Warren) comb. n. 



(Text-figs. 10-12 ; PI. 2, figs. 166-175 ; Map 1) 



Chogada betularia Warren, 1897 : 93. 

 Chogada funesta Warren, 1905 : 398. 

 Neocleora betularia (Warren) Janse, 1932 : 271, pi. 8 : 7, text-fig. 100. 



cJ. Genitalia (Text-figs. 10, 11). Arm of sacculus arcuate and tapered and, except for tip, 

 covered by a setose, membranous fold from ventral margin of valve ; aedeagus long and slender, 

 eight times as long as mean width and twice as long as dorsal margin of valve, with a narrowly 

 rounded apex ; vesica with two tapered cornuti, each slightly longer than one-third of length of 

 aedeagus. 



$. Genitalia (Text-fig. 12). Sterigma sclerotized as in figure ; anterior half of bursa 

 copulatrix membranous, remainder ribbed and sclerotized, strongly at left side. 



Measurements. 6* 45-50 mm. {funesta holotype 35 mm.) ; $ 50 mm. 



An exceedingly variable species, displaying a range of polymorphism in the male 

 (PI. 2, figs. 166-175) similar to that found in transversaria ; the few females for study 

 vary little. In the male lectotype the light buff ground colour of the upper surface 

 of the wings is evenly irrorate with fuscous, comparable with the typical form of the 

 palaearctic Biston betularia (Linnaeus) ; several male examples from Marieps Mtn. 

 are entirely suffused with smoke grey, others have on the fore wing a strongly 

 developed black medial fascia fusing with a black lateral streak in the discal fold 

 (PI. 2, figs. 170, 172). In some examples the medial area of the fore wing and the 

 proximal half of the hind wing are suffused with black (PI. 2, fig. 174) ; in other 

 examples these areas are of the ground colour only very sparsely irrorate with fuscous 

 (PI. 2, fig. 168) ; in each of these latter two forms the remainder of each wing is 

 cinnamon buff. The underside of each wing is white to tilleul buff suffused and 

 marked with drab, the pattern similar to that of the upperside (PL 2, figs. 167, 169, 

 171, 173, 175). 



Closely related to transversaria, differing externally in the appreciably greater 

 size and the rather more produced apex of the fore wing ; differing structurally in 

 the shape of the arm of the sacculus in the male genitalia and in the shape and 

 sclerotization of the sterigma and in the degree and extent of the sclerotization of 

 the bursa copulatrix in the female genitalia. 



