No. 1626. MAMMALS FROM HASTHERN SUMATRA—LYON. 665 
NIADIAS MINOR, new species. 
Type.—Nearly adult male in alcohol, Cat. No. 144264, U.S.N.M., 
collected at the confluence of the Gasip and Siak rivers, eastern 
Sumatra, December 14, 1906, by Dr. W. L. Abbott. Original num- 
ber 4951. 
Diagnostic characters.—Similar in all respects to Nzadias princeps 
(Miller) ,* except in size, being distinctly smaller throughout. Fore- 
arm 72 mm., instead of 84.4. 
Color.—The color of Niadias minor is apparently not essentially 
different from that of V. princeps. It is rather lghter throughout 
and less yellowish on the underparts, perhaps due to its preservation 
in alcohol and the fact that the hair is rather scant above owing to 
sloughing. The fingers, the elbows, and the distal two-thirds of the 
forearms are whitish in color. The antebrachium near its attach- 
ment to the body, the wing membrane between the forearm and the 
fifth finger, and the tips of the wing are also whitish. Some of this 
may be due to sloughing of the dark epidermis, but as this whitening - 
is symmetrical on both sides of the body it is probably natural. 
Skull and teeth—The skull and teeth of Niadias minor are similar 
in every way to those of V. princeps, except in size. See measure- 
ments below. The Sumatran bat lacks the saggital crest. found in 
the bat from the Nias Islands. It is not fully adult, however. 
M easurements.—Type: Head and body, 100 (148) ;° tail, 8 (10); 
tibia, 26 (380) ; foot, 17 (20.5) ; forearm, 72 (84.4) ; thumb, 27 (35.9) ; 
second finger, 48 (61.4); third finger, 108 (143); fourth finger, 89 
(112); fifth finger, 77 (110); skull, greatest length, 32.3 (38.2) ; 
condylo-basal length, 30 (386.4); basilar length, 26.4 (32.6); palatal 
length, 16.6 (20.2) ; zygomatic breadth, 21 (25.4); breadth of brain 
case, 14.4 (15.6) ; interorbital constriction, 6.5 (6.7) ; postorbital con- 
striction, 7.5 (5.8) ; mandible, 25 (28.8); depth of mandible at ante- 
rior molar, 3.4 (3.6) ; maxillary toothrow, including canine (alveol1), 
11.2 (12.2); mandibular toothrow, excluding incisors (alveoli), 12.2 
(13.8). 
Specimens examined.—One the type. 
Remarks.—\t is unfortunate that the single available specimen of 
Niadias minor is not fully adult. From an examination of its finger 
joints its immaturity is scarcely noticeable. The skull, however, 
shows unmistakable signs of immaturity, but they are hardly sufli- 
cient to account for the great difference in size between V. minor and 
N. princeps. ‘The teeth of V. minor are fully developed. Tooth by 
tooth they are distinctly smaller than they are in JV. princeps, espe- 
4@Proc. Biol. Soe. Washington, XIX, p. 61, May 1, 1906; also p. 88, June 4, 
1906. 
>The figures in parentheses are those of the type of Niadias princeps. 
