1908.] Alh'H, Mtnnnmlt* jroni Nicaragua. 669 



50. Blarina olivaceus sp. nov. 



Type, No. 28356, $ ad., San Rafael del Norte (altitude about 5000 feet), Nica- 

 ragua; W. B. Richardson. 



One of the smallest known species of the genus. Total length, 80 mm.; tail, 17; 

 hind foot, 10. Above grayish brown, with a distinct olivaceous reflection in certain 

 lights; below much lighter, the surface whitish gray, with the same olivaceous 

 reflection as above;" feet whitish; ears small, concealed in the pelage; tail with a 

 dusky median line above, sides and below gray. 



The skull is imperfect, lacking the parietal and occipital portions. 

 Compared with B. orophilus Allen, from Costa Rica, the rostral and inter- 

 orbital portions of the skull are much narrower and more elongate, the 

 toothrow straight instead of convex outward; the molariform teeth much 

 narrower and the whole dentition weaker. The lower jaw is correspond- 

 ingly more slender, with narrower and smaller teeth, and the coronoid por- 

 tion noticeably more slender. 



Represented by two specimens, one of them without label or skull, but 

 without doubt from the same locality as the type. 



Blarina olivaceus is very unlike any of the species known from Costa 

 Rica and Guatemala; all of the Mexican species are much larger, and 

 otherwise different, except B. pergracilis Elliot, from Ocotlan, State of 

 Jalisco, Mexico, which it evidently much resembles in size, slenderness, 

 and coloration, but for geographical reasons it can hardly be specifically 

 the same. 



51. Rhynchiscus naso (Wied). Seven specimens, Tuma, Nov. 22, 1907. 



52. Peropteryx canina (Wied). One specimen, Lavala, Oct. 17, 1907. 



53. Hemiderma perspicillatum aztecum (Saussure). Eleven specimens, 

 Volcan de Chinandega, May 6-12, 1907. 



54. Artibeus jamaicensis richardsoni sp. nov. 



Type, No. 28335, cT ad., Matagalpa, Nicaragua, Jan. 3, 1906; W. B. Richardson. 



Similar in coloration to A. intermedius Allen, but very much smaller. Forearm 

 53 mm. (in intermedius 65) ; 3d metacarpal, 50 (in intermedius 57) ; tibia 20 (in 

 intermedius, 22). A faint whitish stripe from base of nose-leaf to ear. 



Skull long and narrow, the brain-case low, not high and vertically expanded as in 

 intermedius; palatal region narrower and more depressed, the posterior nares con- 

 sequently both narrower and shallower; middle incisors relatively larger than in 

 intermedius, in comparison with the outer incisors. Total length of skull 29 mm. 

 (as in intermedius}', zygomatic breadth 17 (19 in intermedius); greatest depth of 

 skull, 11 (12 in intermedius) ; mastoid breadth, 15 (16 in intermedius). Dentition 

 weaker and teeth narrower. Lower jaw much weaker, less bowed outward, and the 

 coronoid vertical instead of directed outward. Zygoma slenderer and less bowed 



