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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 40. 



very similar to Ridgway's ferruginous, with a fine black grizzle, while 

 the legs are dark brownish, in marked contrast to the ochraceous 

 legs of M. pleiharicus. 



There are three good adult male skulls of M. pleiharicus, each of 

 them with little short spike antlers terminating much longer, slender 

 pedicles. Unlike the antlers figured by Kohlbrugge, none of them 

 show burrs. The length of the antlers vary between 22 and 35 mm., 

 decidedly shorter than those figured by Kohlbrugge. The skulls of 

 the other two males are immature, showing long, slender pedicles 

 of soft, spongy bone, with as yet no differentiation of the tip into 

 hard antler substance. 



The most striking characters of the skull of M. pleiharicus are its 

 smaller size and shorter and much slenderer antler pedicles. In 

 addition to these, it differs in several minor details, such as extensive 

 articulation of the upper extremity of the premaxilla with the nasal 

 instead of just meeting the nasal; superior portion of the lachrymal, 

 above the large pit, much narrower, the anterior supero-external 

 surface of the malar narrower and more pointed; the arch over the 

 posterior nares not smooth and rounded but marked by a more or 

 less well-defined, rounded ridge, part of the basisphenoids; and inter- 

 parietal about twice as wide as it is long, instead of about three 

 times. The teeth of the two forms of Bornean muntjac do not show 

 any striking differences; they are about the same size in the two 

 species, hence relatively larger in M. pleiharicus. (See pi. 1, figs. 2 

 and 4, and pi. 2, upper figure.) 



(For external and cranial measurements, see table below.) 



External and cranial measurements of Bornean muntjacs. 



1 Collector's measurements. 



2 Collector's measurements in pounds and quarters computed to kilograms. 



3 Second and third molars not through alveoli. 



4 Last molars not through alveoli. 

 6. Gutted. 



6 Type. 



7 Uterus contained a nearly mature embryo. 



