NO. 1317. MAMMALS OF NORTHWEST SUMATRA— MILLER. 469 



least interorbital breadth, 5.8; ])readth of brain case aboM' roots of 

 z3^goniata, IT; depth of brain case at front of basioccipital, 11.0: fronto- 

 pahital depth at posterior extrendt}^ of nasals, 11.4; least deptli of 

 rostrum immediately behind incisors, 9.0; mandible, 28.0; maxillarj^ 

 tooth row (alv^eoli), 9; width of front upper molar. 2.0; mandibular 

 tooth row (alveoli), 8; width of front lower molar, 2. 



Specimens examined. — One, the type. 



RtnidfJcs. — Le7i()fhri.r raviis is easily recogniza])le among- Malaj^an 

 rats by its woolh' fur, long tail, and bluish gray color, cond^ined with 

 the rather large size. In general appearance it somewhat resembles 

 Musfeireocanux., but the quality of the fur in the two animals is cjuite 

 unlike. 



Family HYSTRICID^E. 



TRICHYS MACROTIS, new species. 



Tyj)e.—M\\\t female (skin and skull). Cat. No. 114488, U.S.N.M. 

 Collected at Tapanuli Bay, northwestern Sumatra, February' 20, 1902, 

 by Dr. W. L. Abbott. Original number, 1555. 



Character's. — Similar to the Bornean Trichys fascicidafa (Shaw) but 

 with longer ears; skull with broader, more strongly angled hamulars. 



Ear's. — The ears differ from those of Tricky s fasciculata in form as 

 well as in size. The anterior border is very moderately convex and 

 the tip is more broadl}^ rounded off than in the Bornean animal. 

 These two characters, in connection with the greater length, give the 

 ear an almost spatulate appearance quite different from the contour of 

 the ear of the i-elated species. 



Color.. — The color so exactly resembles that of Tricky s fasciculata as 

 to need no description. 



Sl'idl and teeth. — The skull closely resembles that of Tri.chysfasci- 

 culata, except that the hamular processes of the pterygoids are of a dis- 

 tinctly different form. In T. fasciculata these processes are slender 

 and uniformly curved throughout, the lower margin slightly thick- 

 ened and the tip tapering rather abruptly to a point. In T. macrotis 

 thej^are much wider, there is an abrupt angle near middle, the lower 

 edge is not thickened, and the tip is broadened and swollen into a dis- 

 tinct head. 



Teeth as in T. fasciculata. 



Measurements. — External measurements of type: Total length, 653; 

 head and body, 428; tail vertebra, 225; hind foot, 64 (01); ear from 

 meatus, 28. Average of four adults from the type locality: Total 

 length, 614(590-653); head and body, 420 (410-428); tail vertebrw, 

 197 (180-225); hind foot, 64 (62-00); hind foot without claws, 00.3 

 (58-62). For details, see table, page 470. 



Cranial measurements of type: Greatest length, 82 (84^); basal 



" Measurements in parentheses are those of a young adult male Trichys fasciculata 

 from Mount Salikan, Borneo (No. 8;?940). 



