Mr. O. Thomas on Neotropical Mammals. 241 
short, finely haired, brown. Outer sides of arms and legs 
greyish, inner sides whitish ; hands and feet wholly white. 
Tail rather short for this group, finely haired and scaled, 
greyish brown above, rather whiter below. 
Skull broad and flattened, with widely expanded zygomata. 
Interorbital region smoothly rounded laterally, flattened 
above, without any trace of ridges; anterior edge of zygo- 
matic plate concave, with a projecting point above, an 
unusual structure in this group; palatal foramina large and 
widely open, not reaching back to the level of m’; back of 
palate level with the hinder edge of m’. 
Dimensions of the type, measured in the flesh :— 
Head and body 140 millim. ; tail 111; hind foot, s. u. 27, 
c.u. 29; ear 19. 
Skull: tip of nasals to back of frontals 23; zygomatic 
breadth 18; length of nasals 13; interorbital breadth 5:1 ; 
palate length 14-2 ; diastema 9°2; palatal foramina 7-2 x 
3°1; length of upper molar series (much worn) 4°8. 
Hab. Kngenheiro Reeve, Inland of Victoria, Prov. Espiritu 
Santo, Brazil. Alt. 500 m. 
Type. Old male. Original number 1224. Collected 14th 
February, 1903, by Mr. Alphonse Robert. One specimen. 
This coarse-haired Oryzomys is allied to the O. dorsalis of 
Rio Grande do Sul, to which it shows its affinity by its 
dark dorsal line and smooth interorbital region, but from 
which it differs by the details above mentioned. 
Akodon suffusus, sp. n. 
Closely allied to A. hirtus, Thos., but the general colour 
stronger, the belly lighter, and with certain cranial differ- 
ences detailed below. . 
Fur close, soft, and thick, about 11 millim. long on the 
back. General colour of the dorsal area grizzled olivaceous 
yellow (rather darker than Ridgway’s “tawny olive’’), this 
colour running forwards on to the crown, but passing on the 
cheeks and sides into cinereous grey. Under surface whitish, 
lighter and more sharply defined than in A. hirtus ; the bases 
of the hairs slaty as usual. Lars short, well-haired, brown, 
an inconspicuous whitish spot at their bases. Hands and 
feet white. ‘Tail well-haired, sharply bicolor, dark brown 
above, white below. 
Skull in general shape like that of A. hirtus, not elongated 
as. in A. longipilis. But it is rather lower and flatter 
throughout, less rounded and convex along the middle line, 
especially in the interorbital region. Anteorbital plate nar- 
row (width 1°7 millim. as against 2°1). Palatal foramina 
Ann. & Mag. N. Hist. Ser. 7. Vol. xii. 16 
