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Show 452 MR. O. THOMAS ON A COLLECTION OF [June 17, colour of back continued down on to the metacarpals and metatarsals. Ears without a projection. Tail quite unicolor, dark brown, clothed throughout with elongated hairs, forming a distinct pencil at the tip. Feet broad, the pads very large and smooth; the proximal two so broad as to touch each other. Fifth hind toes reaching to the middle of the second phalanx of the fourth. Mammae six; one pectoral and two inguinal pairs. Interdental palate-ridges six. Two specimens in the collection, undoubtedly referable to Tschudi's species, show such differences from the specimen from Huambo, named by me in 1882 H. leucodactylus, that 1 am inclined for the present, to consider that, after all, Mr. Tomes's species H. latimanus, with which M. Stolzmann's specimen agrees, should remain as a good species, and is not synonymous with H. leucodactylus, as I had considered it. Judging only from the specimens I have seen, //. leucodactylus may be distinguished from H. latimanus by its larger size (see dimensions above), especially its much larger feet, its more bushy tail, larger teeth, both absolutely and relatively (see skull-dimensions), and by the presence of six instead of five interdental palate-ridges (see Plate XLIV. figs. 6 & 7). It is of course possible that specimens will yet be found intermediate between the two forms, in which case they will again have to be united. 3. HESPEROMYS (ORVZOMYS) LATICEPS, Lund. S. No. 4. a to I. Twelve specimens. Junin and Amable Maria. a. b. c. d. 8 • 8 • 2 • 2 • Head and body. ... 127 ... 127 ... 126 ... 118 Tail. 123 126 125 118 Hind foot. 30*5 30*6 29*0 29*2 Forearm and hand. 37*0 370 34*0 330 Ear-conch. 17*8 17*5 16*5 17*0 Muzzle to ear. 30*0 30*0 29*8 28*4 * H E S P E R O M Y S LATICEPS, var. NITIDUS, var. nov. (Plate XLII. fig. 1.) a to r. Eighteen specimens, mostly young. Junin and Amable Maria. a. b. c. d. c. 2 - 2 -• 8 .. c? •• 8 •• Head and body. ... 123 ,.. 121 .. 118 ... 118 .. 117 Tail. 149 135 133 148 135 Hind foot. 30*9 30*6 31*3 320 29*9 Forearm and hand. 34*0 340 343 35*0 34*0 Ear-conch. 17*8 170 17*8 18*8 19*0 Muzzle to ear. 28*4 28*4 27*7 30*4 27*4 These specimens are readily separable at sight from the ordinary H. laticeps, more resembling H. albigularis, Tomes, or H. vulpinoides, Schinz, in their general appearance; but a closer examination shows |