250 PIEROPUS lUTXERI GROUP. 



(type, and 88 5.9.1). Blackish or dark seal-brown above and 

 beneath ; rump, sides of belly, and flanks more or less thickly 

 sprinkled with golden ochraceoiis or tawny hairs, most of these 

 hairs with concealed silvery greyish-white bases. "Tippet" (mantle) 

 reduced to a tuft of rich tawny hairs on each shoulder (or one 

 median tuft), the tawny colour confined to the tips of the hairs 

 and shading through ochraceous-buff in subapical portion to buffy 

 whitish in basal portion of hairs ; many of the blackish hairs in 

 siioulder region tipped with golden tawny. 



A third skin (aged, unsexed, teeth well worn ; 88.5.0.2) differs 

 in having the mantle practically uniform blackish, with some of the 

 hairs in the shoulder region tipped with chestnut. 



Measurements. On pp. 248, 249. 



Specimens examined. The British Museum material. 



Range. Only known from Johanna Island, Comoros. According 

 to Humblot common in the large forests covering the summit of 

 Johanna Island, but never seen in the low-lying portions of the 

 island (Milne-Edwards & Oustalet, I. s. c). 



Type in collection. 



o. Ad. sk. ; skull. Johanna I., Comoros Earl Russell [P.]. 63.12.11.2. 

 {Dr. LiviiiffsUjiie). (Type of species.) 



i, c. 2 ad. sks. ; skulls. Johanna I. Purchased (Frank). 88.5.9.1, '2. 



G. The Ptbmopus raynehi group. 



Species. — Sis: Ft. cognutus, rayneri, ruhianus, Javellunus, yrandis, 

 and chrysoprocius. 



Range. — Solomon Islands and Moluccas. 



General characters. — Rostrum shortened ; coronoid height of man- 

 dible generally less than c-m.,. Posterior ledges of premolars short ; 

 m^ reduced ; i^, i^, and Pj unmodified. Ears moderate, exposed ; fur 

 of back short, adpressed; tibia hairy above (in Pt. chryso2}roctus very 

 thinly so). Colour in one species nearly uniform brownish above 

 and beneath, with paler mantle, in all the others the upperside is 

 tricoloured (bright mantle, dark back, bright rump). Males of all 

 species, except Pt. chrysoproctus, with well-developed neck-tufts. 

 Size varying (forearm 120-177 mm.). 



Differentiation of species.— The extreme eastern species {Pt. 

 cognatus : San Christoval) is externally (colour, size) rather similar 

 to Pt. bru7ineus and Pt. lombocensis. In the other four Solomon 

 Island species the rump is considerably brighter than the back, as 

 bright as, or brighter than, the mantle ; this tricoloured style of the 

 coloration of the upperside (bright mantle, dark back, bright rump) 

 is found again in the Moluccan representative of this group, but in 

 no other species of the genus. Pt. rayneri (Guadalcanar) is larger 

 than Pt. cognatus; Pt. ruhianus (Ilubiana), Pt. lavelJanus (Vella 

 Lavella), and Pt. grandis (Shortland and Bougainville) still larger. 

 The fhiec latter species, which are closely interrelated, ditfer 



