NO. 1466. 



NOTES OX MALA VAX PKIS—MILLEIL 



751 



cxtremitie.s of styloid processes; outer plate of pten^goid so little 

 expanded that the pterygoid fossa is scarcely inoi'o than a flattened 

 depression, from the inner side of which projects the long, slender, 

 hamular process; greatest palatal width, including outer pterygoid 

 plate, nuich less than half distance from posterior median edge of 

 palate to foramen magnum. That this peculiar structure is not due 

 to immaturit}' is shown ))y the perfect constancy of the l)roadly diver- 

 gent tj'pe at all ages, from suckling young to the oldest adults. It 

 clearly represents a ver}- unusual individual variation or a distinct 

 s[)ecies. I find it impossible, however, to reach any satisfactory con- 

 clusion from the material at hand. 



SUS NIADENSIS, new species. 

 Plates LXII, LXIII, and LXIV. 



JyjPt^.— Adult female (skin and skull) No. 141167, U.S.N.M. 

 lected on Nias Island, March HO, 1905, by Dr. W. L. Abbott, 

 number, 4155. 



Characters. — Similar to Sns vittatnx^ l)ut with posterior molars con- 

 siderably enlarged, the combined length of the last two teeth more 

 than 50 mm., the greatest width of posterior upper molar noticeably 

 more than least width of palate at front of this tooth. (Plate LXII 

 fig. 1.) No evident diastema between canine and first premolar in 

 female (male not known). Color normal. 



Measurements. — For measurements see table, pages 755 and 756. 



Sjyeciinens examined. — Four (3 skins), all from Nias Island. 



Bemarlis. — ^The Nias pig differs from all the other known meml^ers 

 of the vittatus group in the conspicuous enlargement of the posterior 

 two molars both above and l)elow. 



The differences in size of these teeth between this animal and t>HS 

 rittatus and S^is rkionis are as follows: 



Col- 

 Orip'inal 



In size and form the skull closely agrees with that of Sus vittatus., 

 showing no tendency toward the broadening characteristic of the species 

 occurring on the islands north of Nias. In fact, so far as can be 

 determined from the material examined, tlu^ zygomata appear to be 

 less abruptly flaring than in the mainland pig. 



