Leptonycteris nivalis nivalis (Saussure)
Long-nosed Bat
1860. M. [= Ischnoglossa] nivalis Saussure, Revue et Mag. Zool., Paris, ser. 2, 12:492, November, type from near snow line of Mt. Orizaba, Veracruz.
1900. Leptonycteris nivalis, Miller, Proc. Biol. Soc. Washington, 13:126, April 6.
Distribution in Tamaulipas.—Probably throughout southern part of state, but presently known only from one locality.
The specimens herein reported were taken in a cave. They provide the first record of the species from Tamaulipas and are assigned to the subspecies nivalis on the basis of their brownish color and small size in comparison with specimens of L. n. longala from Coahuila (see also description and measurements of longala given by Stains, 1957:356). None of the specimens suggests intergradation in color between nivalis and longala, but some are slightly larger than specimens of the former from Veracruz.
Twelve females taken on August 27, 1961, were pregnant. Each carried a single embryo, the embryos averaging 15.7 (12-20) mm. in crown-rump length. The average weight of the 12 females was 26.9 (24.5-30.0) grams; 10 males weighed an average of 24.6 (21-28) grams.
Measurements.—Average and extremes of ten specimens (5 males and 5 females) are as follows: 78.2 (76-80); 0.0; 16.4 (15-17); 16.7 (16-19); length of forearm, 48.4 (45.2-54.3); length of third finger, 100.8 (99.2-103.7); greatest length of skull, 26.8 (25.9-27.6); zygomatic breadth (6 only), 10.9 (10.7-11.1); least interorbital constriction, 4.6 (4.5-4.9); mastoid breadth, 10.8 (10.5-11.2); length of maxillary tooth-row, 8.7 (8.4-9.0).
Records of occurrence.—Specimens examined, 28: all from 6.5 mi. N, 13 mi. W Jimenez, 1250 ft.