Genera Nyctalii.«, T} lonycterls, and Pi|tif«trcllu3. 227 



proportion with the skulls, as spcciiiicns with the largest 

 .skulls have only the same t'orearui-lcii;;th a.s examples with 

 quite small .skulls ; the toicarms are tlu-refore of praetically 

 very little use iu (listinj;uisliin^ the ditU'reiit iorms. 



NVorking then from the skulls, wo find that there are threo 

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

 amy one size being, as a rule, alone in a given eountry ; hut 

 Java, the tyj)e-lucality of 2\ pachyints, has both large and 

 middle in it, antl it is therefore necessary to settle which of 

 these two is the type-form. 



'I'iie Museum collection contains a considerable series from 

 Buitenzorg and Tasikmalaja of the middle species, and from 

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

 example of T. pachi/pus acquired from the agent of the 

 Leydcn Museum in lb-i4, and this s[)ecimen clearly belongs 

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

 zorg, near the type-locality of j)uc/ti/j>us, Bantam. 1 there- 

 fore propose to assign the name pachypus to this form, the 

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

 1I'7-12*0 mm. in greatest length, its maxillary tooth-row 

 (front of canine to back of m^) 3'8 to -I'U mm. 



In the Philip[)ines (Luzon) we have the smallest form 

 (skull 10*2 mm., tooth-row 3*4:), representing T. meyeri, 

 Peters, but a similarly small form occurs in Burma, and it 

 should probably bear the name of T. I'lthidus, Blyth, described 

 from fcjchwe 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 appear to need new names. 



Tyloiiycteris robustula, sp. n. 



Body stout and robust, though the torearms are not only 

 not longer, but are even commonly shorter, than in T. pacliy- 

 pus. Jiiars thick and fleshy ; tragus short and comparatively 

 broad. 



Colour above dark brown; little lighter beluw. Mem- 

 branes black. 



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

 and interorbital constriction. .Muzzle proportionally short. 



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

 men) : — 



i^orcarm 20 mm. (range up to 28). 



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

 third finger, metacarpus 20, first phalanx 10 ; fifth finger, 

 metacarpus 23*5, first phalanx i'l ; tibia 10 j hind foot G'3 ; 

 breadth of foot -pad 3*5. 



