CHIROPTERAN' NOTE? 35 



found in fumigatiti ; the })i'()xini<-d phalanges of the digits are 

 c'oni})ai-atively shorter; the tail much shorter. The similarity in 

 dentition is simply due to the fact that Ijoth species are on a 

 very high level of evolution, hut ferrmn-equinum is an Oriental- 

 Palaearctic ofifshoot of the Rh. simplex group, famigatus an 

 Ethiopian representative of the Rh. macrotis group, th(^ simila- 

 rity in dentition, therefore, an instance of convergence, not indi- 

 cative of true relationship. 



16. Ftliiiioloplivis euryof is ai'tiensis, subsp. n. 



a. Q iid. (in ale). Aru Islands. Collected by V. Rosenberg. Received from 

 Dr. Jentink. Genoa Museum. Type of the subspecies. 



The smallest race of Rh. euryotis. 



Rh. e. aruensis comes very near to Rh. e. tiinidus, from 

 IJatchian, but the skull is a trifle smaller and slenderer, the man- 

 di])le shorter; the teeth will probably prove to" average smaller. 

 Also externally Rh. e. aruensis is very similar to the Batchian 

 race; this latter, as compared with Rh. e. euryotis and prmstans, 

 is chiefly characterised externally by its narrow horse-shoe and 

 rather small ears; in both respects Rh. e. aruensis accords with 

 Rh. e. timidus, but the forearm, the pollex, the phalanges of 

 the third, fourth and fifth digits, and the foot are smaller. For 

 details see the table of measurements p. 30. 



A year ago ('), when working out the series of Rh. euryotis 

 in the collection of the British Museum, I distinguished three 

 races, viz. — Rh. e. tirnidus, from Batchian, characterised chiefly 

 by the narrower horse-shoe and rather slenderer skull; Rli. e. 

 euryotis, from Amboina, with broad horse-shoe and rather more 

 heavily built skull; and Rh. e. prcesians, from the Key Islands, 

 which marks the extreme in the size of the horse-shoe and the 

 width of the skull and nasal swellings. From this it will be 

 observed that, passing from Batchian in the north, through Am- 

 boina, to the Key Islands in the south, there is an increase in 

 the size of the horse-shoe and skull , and it nnght therefore be 



('j Ann. 6c Mag. N. H. (7) XVI. pp. 2S5-S7: Sept. 1905. 



