CniROPTER.W XOTES 41 



anterior lower premolar are in johorensh comparatively shorter 

 or smaller than in pUcatus. 



Frontal box. — A sul)lrianjj;-ular groove between the ears, 

 about 5 nnn. broad and 5 mm. long. A deep transverse band 

 connecting the anterior margins of the ears, in front of Ihe groove; 

 the upper border of this band is subtriangularly raised in the 

 middle ; this median , triangularly projecting portion of the band 

 is convex on the front aspect, hollow on the posterior aspect, and 

 fits like a lid to tlie groove ; tufts of long hairs in the front part 

 of the bottom of the groove, and on the posterior aspect of the 

 lid near its base. The animal can fold the upper half of the ear- 

 conch downwards; in doing so, the connecting band (and conse- 

 quently the lid) is drawn forwards, disclosing the groove; in the 

 erect position of the ears, the groove is covered by tlie lid. — 

 This frontal box in certain respects recalls a frontal apparatus 

 recently described by me in the Phyllostome genus M/cro- 

 nycteris (^), but is more complicated in structure. Its function is, 

 no doubt, the same as that of the frontal sac in many species of 

 Hipposiderus ; this sac has no « lid », Ijut its « lips » can be 

 opened or closed ad libitum, and the bottom of the sac is, like 

 the groove in Ch. johorensis, furnished with a tuft of long hairs, 

 projecting through the aperture of the sac. — It should be remem- 

 bered that the specimen ot Ch. johorensis oljtained by Dohrn is 

 a male, as is also the type in Calcutta. Females of this species 

 being as yet unknown, it remains uncertain, whether they possess 

 a frontal l)ox, or, if so, whether it is of the same size and struc- 

 ture as in the males. 



Affinities. — Ch. johorensis is closely related to Ch. pUcatus, 

 Ch. jobensis, and allied species. The only essential difference 

 in the skull is the more flattened rostrum in johorensis, a 

 peculiarity which is probably a consequence of the development 

 of a complicated frontal apparatus in this species. The dentition is 

 in all important respects the same. Apart from the frontal appa- 

 ratus, there are scarcely more than two external points worth 

 mentioning: the tragus is a little Ijroader in johorensis than in 

 pUcatus, but hardly more so than in jobensis; the fifth meta- 

 carpal would seem to be proportionately somewhat longer in 



(1) Ann. & Mag. N. H. (7) XVU. p. 52; July 1906. 



