Mr. 0. riioinas — Notes on Bubirussa. 187 



Babirussa hahyrussa frosti, subsp. n. 



Size slightly smaller than in habyrussa. Upper canines as 

 in the latter, not bent in, crossing each other or cotn[)ressing 

 the nasals, as is the case in B. celebensis. But they are con- 

 spicuously smaller and shorter than in bahyrussa, and do not 

 rise nearly so high above the muzzle as in that animal. 

 Basial pits almost always absent, only occurring (an 1 these 

 shallow) in two out of eleven skulls. BulUo small, nanow, 

 flattened from side to side, their breadth much less than tludr 

 horizontal diameter, in niaik'd contrast to the bioad sub- 

 triangular buUse ot typical babyrusaa; the crest leiding 

 upwards from their outer corners behind the glenoid fossai 

 well developed, much higher than that on the outer side of 

 the base of the paroccipital process, this proportion being 

 reversed in babyrussa. Paroccipital process more slender. 



Dimensions ot' the type-skull : — 



Length^ nasal tip to occiput, 27-i mm. ; condylo-basal 

 k-ngth 2G8 ; zygomatic breadth 124; nasals, length 131, 

 anterior breadth 22, mesial breadth 15, posterior breadth 31; 

 occipital breadth 73; palatal length 178; bullse, horizontal 

 length 25, breadth 13. 



Leny-tli of canine along front curve 111, crreatest length 

 above nasals 45; greatest basal diameter 13. Front of p'^ to 

 b.iek of in 6S ; ?«', length 22, breadth 15. Length of lower 

 canine 77. Length of lower tooth-row 74. 



The older skulls may attain to 284 mm. in condylo-basal 

 length. 



//ab. Tali Aboe Island, east of Celebes. 



Type. Adult (but not old) male skull. B.M. no. 19.11.23.1. 

 Presented to the Natioiuil Collection by VVdfred Frost, Esq. 

 Lleven skulls examined. 



In the above various points there is such a strong average 

 difference between the Babirussa of Buru and the form found 

 in Tali Aboe that I think the latter should certainly bear a 

 varietal name, even though some of the points may prove to 

 be rather " average ^^ than absolute characteristics. 



8ix of the skulls (including the type) were obtained by 

 iMr. Frost on the comparatively high middle third of Tali 

 Aboo, while the other tive came from the lowlands of the 

 esistern third. The latter skulls — of wiiich three at least are 

 lully adult — are rather smaller than the furmer, but the 

 difference does not amount to much, and is, perhaps, due to a 

 .shortage uf the food available in compelilii^n wilh tlie native 

 pigs of the lowlands. 



