Genera Nyctalup, T}lonycteris, and ripistrcllus. 227 



pro]jortion with the skulls, as specimens with the largest 

 skulls have only the same forearm-length as examples with 

 quite small skulls ; the forearms are therefore o£ practically 

 very little use in distinguishing the different forms. 



Working then from the skulls, we find that there are tliree 

 sizes represented in the series — large^ middle, and small, — 

 any one size being, as a rule, alone in a given country ; but 

 Java, the type-locality oE T. pachypus, has both large and 

 middle in it, and it is therel'ore necessary to settle which of 

 these two is tlie type-form. 



The Museum collection contains a considerable series from 

 Ikiitenzorg and Tasdcmalaja of the middle species, and from 

 Sockaboemi of the large one. In addition, there is a co-typical 

 example of T. ijachijinis acquired from the agent ot the 

 Leyden Museum in 18-14, and this specimen clearly belongs 

 to the smaller Javanese form, the one we have from Buiten- 

 zorg, near the ty[)e-locality of pachypus, Bantam. 1 there- 

 fore propose to assign the name pnc/iyj)us to this form, the 

 middle in size of the whole series, which has a skull about 

 li'7-12*0 mm. in greatest length, its maxillary tootli-rovv 

 (front of canine to back of m^) 3'8 to 4*0 mm. 



In the Bhilippines (Luzon) we have the smallest form 

 (skull 10'2 mm., tooth-row 3*4), representing T. meyeri, 

 Peter.", but a similarly small form occurs in Burma, and it 

 shoidd probably bear the name of T. ritbidus, Blyth, described 

 froni kSchwe Gyen. It is commonly deep rufous in colour. 



Northwards and eastwards from Java occurs the largest 

 species, while in Western India there is a middle-sized form 

 of a peculiar colour, and these two appi-ar to need new names. 



Tylonycteris robustida, sp. n. 



Body stout and robust, though the forearms are not only 

 not longer, but are evencommoidy shorter, than in T. pachy- 

 pas. Ears thick and fleshy ; tragus short and comparatively 

 broad. 



Colour above dark brown; little lighter below. Mem- 

 branes black. 



Skull heavily built, very broad, both across the brain-case 

 and interoibital constriction. JMuzzle proportionally short. 



Dimensions of the type (measured on the spirit-speci- 

 men) : — 



Forearm 2G mm. (range up to 28). 



Head and body 43 ; tail 27*5 ; ear 10 ; tragus 2*2 X 1-5 ; 

 thiril finger, metacarpus 2G, Hrst phalanx 10 ; hfth finger, 

 nietacarpus 23"5, first phalanx 4*7; tibia 10; hind foot 6"3 ; 

 breadth of foot-pad 3'5. 



