Neotropical Bats of the Genus Eptesicus. 363 
Eptesicus montosus, sp. n. 
A small Eptesicus with swollen and rounded skull. 
Size about as in #. brasiliensis, Fur very long and fine, 
hairs of back about 9 mm. in length. General colour blackish 
brown, lightened on the posterior back by the Prout’s brown 
of the tips of the hairs. Under surface also brown, the tips of 
the hairs paler brown. Lars and tragus apparently as in 
brasiliensis. 
Skull, as compared with that of brasiliensis, conspicuously 
more swollen, higher in the brain-case, with much broader 
and quite unridged interorbital region, the whole skull less 
flattened and less ridged. 
Molars apparently rather narrower transversely than in 
brasiliensis, their longitudinal diameter about the same. 
Dimensions of the type:— 
Forearm 43 mm. 
Head and body 55; tail 43; third finger, metacarpus 40 ; 
first phalanx 13; lower leg and hind foot (c. u.) 26. 
Skull: greatest length 15°6; condylo-basal length 15:2 ; 
basi-sinual length 12; zygomatic breadth 10°3; interorbital 
breadth ,4°2 ; breadth of brain-case 8; vertical height, in- 
cluding bullae, 7°6 ; palato-sinual length 6:2 ; front of canine 
to back of m® 6; front of p? to back of m? 4. 
Hab. (of type). Choro, north of Cochabamba, Highlands 
of Bolivia, on the upper waters of the R. Mamoré. Alt. 
3600 m. 
Type. Adult male skin and skull. B.M. no. 2.1.1.1. 
Original number 1433. Collected 8th May, 1901, by P. O. 
Simons. Presented by Oldfield Thomas. 
“ Native name Chini.”—P. O. S. 
All the hitherto described South-American species of 
Eptesicus lave a characteristicaliy flattened skull with widely 
spread zygomata and narrow interorbital region, while this 
highland torm differs by its much higher and more rounded 
skull. Attention is especially drawn to the great interorbital 
_ breadth and the vertical height of the brain-case. 
This is the “Vespertilio sp.—hilatrei group ”’ of my paper 
on Mr. Simons’s Bolivian collection *, 
An allied species is a 
Eptesicus inca, sp. n. 
Near E. montosus, but larger. Skull more heavily ridged. 
General characters of montosus, with similarly large inflated 
* Ann. & Mag. Nat. Hist. (7) ix. p. 126 (1902). 
