160 IROCEEDIXGS OF THE yATIOy^lL MUSEUM. vol. 4.3. 



on the outer surface, gradually increasing in quantity toward the 

 base, whore the ear is as well furred as the body. 



No shoulder stripe is present on Ptilocercus, but distinct markings 

 are found on sides of head, consisting of a distinct black patch, 

 almost a stripe, extending from near the tip of the nose, posteriorly 

 throut^h the eye a little more than half way to base of ear. This 

 black patch is bordered above and below not by distinct light stripes, 

 but by the rather light color of top of head and the distinctly light 



color of the underparts. 

 At the beginning of the 

 black face stripe arise 

 well developed vibrissse 

 lacking in the Tupaiinae. 

 (Plate 7.) 



Cranial cJcaracters. — 

 Some of the most funda- 

 mental differences be- 

 tween Ptilocercus and 

 the other Tupaiidse are 

 found in the region of 

 the orbit, certain struc- 

 tures in one having no 

 direct counterpart in the 

 other. Twpaia has a 

 disdnct supraorbital 

 foramen, which is con- 

 tinued backward as a 

 well-marked groove on 

 the underside of the up- 

 per rim of the orbit. 

 There is no counterpart 

 of this foramen or groove 

 ia Ptilocercus. The infra- 

 orbital is a long canal in 

 Twpaia, the proximal 

 end in the orbit aiid the 

 distal end of the canal 

 over the penultinate upper premolar: m Ptilocercus the canal is much 

 shorter and is situated over the middle of the last upper premolar. 

 In the most anterior corner of the orbit is the posterior opening of 

 another foramen leading mto the nasal fossa. In Tujpaia this open- 

 ing is situated in a distinct notch, 2 mm. or so in size, and the upper 

 end of this notch forms a distinct blunt spine. This notch and spine 

 are entirely lacking in Ptilocercus. The position of the orbits in 

 Pt^Xocerais" "13, quite different from that in the Tupaiin^. They are 

 relatively larger, and placed relatively farther forward; the posterior 



PiG.-i4.— FnLOCEECUs LOWD cosTDrExns, X U; Cat. No. 112611, 

 U.S.K.1I., Skjtbeoxg KrsxE, Johobe, Malay Pexiksula. 



