1905.] OF THE GENUS EHINOLOPHUS. 101 



longer than in rouxi, i. e. more than 1| the length of III.^ 

 (cf. nereis and sthetio). Y? is extremely short. 



Colour. To judge from specimens preserved in alcohol, probably 

 not far from being the same as in the dark phase of IvTepal examples 

 of Rh. rouxi. 



ShuU. The essential characters are as in rouxi, thus pi-oving 

 Rh. thomasi to be an oifshoot from that type of Bat, not (as might 

 very well be supposed, in view of the short metacarpals) from 

 borueensis. The skull of Rh. thomasi agrees with that of rouxi in 

 the broad brain- case ; it differs from rouxi in the much smaller 

 size. Compared with borneensis, the skull of Rh. thomasi is as 

 small as in the smallest individuals I have seen of borneensis (even 

 as small as in malayanus), but the brain-case is markedly broader, 

 even broader than in the largest borneensis, and the supraorbital 

 length is exceedingly short (cf. measvirements, p. 100). 



Dentition. Pg external ; p^ and p^ in contact ; p^ external. 

 Upper canine and p* in contact. Both of tlie specimens examined 

 are identical in dentition. 



Measurements. On p. 100. 



Type. 2 ad. (in alcohol). Karin Hills, Burma, 1888. Collected 

 by Signor Leonai'do Fea. Presented by Marquis Ct. Doria. Brit. 

 Mus. no. 90.4.7.10. 



I venture to connect with this fine species the name of 

 Mr. Oldfield Thomas, who already thirteen years ago [l. s. c.) 

 pointed out that it could scarcely be identified with any hitherto 

 known form, but refrained from describing it as new, owing to 

 the general confused state of this gi-oup of Bats. 



13. RnixoLOPHUS afpinis Horsf. (Plate III. figs. 11-13.) 



Diagnosis. Sella pandurate. p'^ in the tooth-row. Forearm 

 50-56 mm. 



Details. This species marks an important progress in develop- 

 ment as compared Avith Rh. rouxi. It is the base of the ferrum- 

 equinimi section. 



The chief modifications are four : in the shape of the sella ; in 

 the structure of the wings ; in the size of the animal ; in the 

 shortening of the palatal bridge. 



In the borneensis-rouxi type the sella is practically parallel- 

 margined ; in affinis it is pandurate, i. e. the lateral margins 

 concave, as in ferrum-equinum, though generally to a slightly 

 less degree. In sim,plex and its closest relations the lancet 

 is almost cuneate ; in borneensis there is a tendency towards 

 emargination of the lateial margins ; in rouxi this tendency is 

 carried to an extreme ; in affinis the lancet falls back to the former 

 stage : it is almost cuneate. 



Throughout the whole series of fonus reviewed above, with the 

 exception of the somewhat aberrant Rh. nereis, stheno, and thomasi, 

 the wings have remained at the same primitive stage : no length- 

 ening of the second phalanx of the third finger. In affinis th.hi 

 . phalanx has considerably increased in length, being always more 



