288 On the Bats of the Rliinoloplins arcuatus Group. 



projecting nasal swellings, larger premolars and molar?, 

 therefore wider temporal fossa and liigher sagittal crest; 

 considerably larger size. There is a certain tendency in the 

 genus Rkinolojjhus to a development of a large and a small 

 representative of quite the same " type " ; the difference in 

 size is so well marked and without any intergradation that 

 we cannot but recognize them as distinct " species/' although 

 they sometimes, as in the present case, inhabit the very same 

 island ; thus B.h. subrvfus (Luzon) bears very much the 

 same relation to Rh. arcuatus (Luzon) as Rh. acuminatus 

 (Java) to Rh. minor (Java), Rh. Rouxi (Himalayas) to 

 Rh. borneensis, Rh. me^aphi/llus (Australia) to Rh. simplex 

 (Lorabok) . 



Rh. Creaghi ^, from the extreme north-east of British N. 

 Borneo (Saudakan), is very closely related to the Philippine 

 Rh. arcuutus : the same type of skull, if anything a trifle 

 more advanced in the size of the temporal fossa, but the 

 difference is extremely small indeed ; the same shape and 

 size of the nasal swellings ; the dentition on quite the same 

 stage as in arcuatus exigims (p^ rudimentary or wanting) ; 

 the same shape of the horseshoe, the sella, and the lancet, 

 but more rounded internasal lobes ; the broad ears charac- 

 teristic of the group ; the three mental grooves ; the same 

 wing-structure ; the short tail. But it is unique in the 

 following points: — The connecting-process is obliterated; 

 the median portion of the posterior nose-leaf is peculiarly 

 inflated and provided with a conical tuft of coarse hairs ; 

 when pressed backwards the sella leans against this hair-tuft, 

 which therefore jjractica/ly replaces the missing connecting- 

 process. 



Rh. i7i()j)s is in every respect, cranial and external 

 (apart from the size), very much like Rh. arcuatus, but 

 highly peculiar in the shape of the summit of the sella. The 

 mental grooves do not reach the free border of the lower lip; 

 it would seem to indicate a beginning obliteration of the 

 grooves. 



The essential cranial character of the group, viz. the 

 abruptly projecting nasal swellings, culminates in the large 

 and broad-skulled lih. euryotis, in which the front part of 

 the horseshoe is slightly modified. The species reviewed 

 above are confined to the Philippines and N.E. Borneo, 

 Rh.euryotis to the islands between Celebes and New Guinea. 



The Rh. arcuatus giou]), as here defined, has no represen- 

 tatives in the Ethiopian Region. 



* Thomas, Aun. .^ Mag. Kat. Hi.st, (fi) xviii. (1890) p. 241. 



