■ Wrv CASIXYCTERIS AKGYNNIS. 



outlijie of the premolars aud molars, and llie heightening of their 

 outer cusps, the dentition of this genus is very similar to that of 

 iScoioni/cteris, and the details iu which it differs (chieflj- the stronger 

 development of the inner cusp of p' and p^, the divergence of the 

 outer and inner cusps of the large premolars and molars, and the 

 less pronounced reduction of the posterior molars) would in them- 

 selves be far from justifying its generic separation from Scoto- 

 nycteris. With this close external and dental resemblance to 

 IScotonycterls, the present genus combines, however, a modification 

 of the bony palate absolutely unique in Megachiroptera and more 

 closely approaching to the type of palate predominant in Micro- 

 chiroptera. It might seem a little strange, that tlicse two genera, 

 though so closely related as to be evidently modifications of one 

 type of bat, are nevertheless inhabitants of the same faunistic area. 

 It appears reasonable to suppose, however, that the profound differ- 

 ence in the posterior portion of the bony roof of the mouth must be 

 connected cither with an essentially different nature of the food on 

 which they subsist or with a different treatment of that food or 

 with both, and in any case there would, as far as the food is con- 

 cerned, be but little real competition between them. 



1. Casinycteris argynnis, Tho$. 



Casinvcteris argynnis, Thomus, Aim. ^- Muq. i\'. H. (8) vi. p. Ill 

 (1 July, lyiO: Eitye). 



Fur. — Distribution, quality, and length of fur as in Scoionycteiis 

 ziiikeri (p. 567) ; length of fur on back about 8 (general mass of 

 hairs) and 13 (longest hairs), on middle of belly G-7 mm. 



Colour (type, adult female, skin, November). — General colour of 

 back a slightly russet tinge of Avood-brown ; individual hairs 

 whitish at middle, seal-brown at base, with short russet wood- 

 brown tips not quite concealing subapical whitish colour of fur. 

 Nape of neck paler than back, owing to shortness or even absence 

 of wood-brown tips to the hairs. Head similar to back, but slightly 

 deeper in colour; a sharply defined white patch of oblong shape on 

 bridge of rostrum extending back to level of middle of eyes ; 

 a smaller white patch immediately behind posterior canthns of 

 eyes; a small white patch at anterior base of ears; ujiper lip 

 broadly edged with white from angle of mouth to some distance 

 behind nostrils. Foreneck thinlj' clothed with long whitish hairs ; 

 median tract of breast whitish slightly shaded with drab, sides of 

 breast and belly drab sprinkled with white, flanks broccoli-browJi. 

 " Wings, ears, e}"elids, and muzzle bright orange" in life (G. L. 

 Bates). 



Measiirenients . On pp. 573-575. 



Specimen examined. The type, in collection, is so far the only 

 specimen known. 



Range. The Camcroons (as yet only recorded from Eitve, altitude 

 2(100 feet). 



a. 5 nd. gk. ; Bitye, R. Jg, 5:E. Camcroons, G. L. Bates fC.]. 11.5.0.1. 

 i\\\\\. 21X)0' ; 19 Not. 1909. (Ty/e of spedes.) 



