no. 1809. MAMMALS FROM BORNEO AND VICINITY— LYON. 135 



Ears. — Large, extending about 3 mm. beyond end of muzzle when 

 laid forward; inner margin uniformly convex; outer margin with a 

 very obtuse angle about opposite tip of tragus; tragus, long (8.5 mm.) 

 slender (1.7 mm. wide at base), tapering gradually to a point, at 

 lower outer angle, a small obtuse lobe, projecting about 0.5 mm. 



Skull. — Brain-case rather narrowed from side to side but consider- 

 ably enlarged and swollen from above downward, anterior^; inter- 

 orbital region narrow (3 mm.); a small concave depression at base of 

 rostrum, in front of interorbital constriction; as the skull rests on its 

 natural base the facial portion is much tilted upward ; or with the 

 skull resting on the maxillary toothrow, the cranial portion is much 

 tilted upward; in comparison with K. hardwickii and K. picta, the 

 portion of the palate posterior to the toothrow is verj^ narrow (about 

 1.5 mm. as to 2.0 mm.) 



Teeth. — Very similar to those in the Kapuas River specimen of 

 Kerivoula hardwickii, except that m 1 is more compressed antero- 

 posteriorly, pm 3 has a slightly greater crown surface and less vertical 

 depth as compared with the other upper premolars; the lower pre- 

 molars in K. bombifrons are relatively slightly larger and with greater 

 antero-posterior diameter than they are in K. hardwickii, especially 

 the middle premolars. 



Measurements. — Head and body, 39 mm.; tail, 40; forearm, 30; 

 second digit, 30; third finger, 60; fourth finger, 47; fifth finger, 41; 

 tibia, 14; foot, 9; ear from crown, 12; ear, tip to tip (without stretch- 

 ing), 25; greatest breadth of ear, 11; condylo-basal length of skull, 

 13; maxillary tooth-row, including canine, 5.6; mandibular tooth- 

 row, front of canine to back of last molar, 6.2; zygomatic width, 7.8; 

 width of brain-case, 6.8. 



Specimens examined. — One, the type. 



Remarks. — The only other species of Kerivoula hitherto recorded 

 from Borneo are hardwickii, 1 pusilla, 2 and papillosa. 3 From If. hard- 

 wickii, K. bombifrons differs conspicuously in its narrower skull, 

 anteriorly inflated brain-case, narrower interorbital constriction, and 

 by its lighter color; from K. pusilla, by its generally larger size and 

 distinctly larger ears; and from K. papillosa by its much smaller size, 

 relatively larger ears, and relatively larger incisors. 



Shot while hanging from a leaf in dense forest. — W. L. A. 



1 See page 134. 



2 Thomas, Ann. Mag. Nat. Hist., ser. 6, vol. 14, p. 461, December, 1894. 

 a Hose, Mammals of Borneo, p. 40, 1893. 



