Tamaulipan specimens do not differ significantly in external or cranial measurements in comparison with the specimens from Veracruz reported by Dalquest and Hall (1949:154), but do differ in color. Most are in the gray phase and are Avellaneus (grayish with yellowish hairs mixed) instead of Clay Color as are specimens from Veracruz; those few in the red phase are between Clay Color and Tawny-Olive instead of between Burnt Sienna and Chestnut. By consequence, bats from Tamaulipas resemble in color the smaller N. s. mexicanus of western México to a greater degree than they resemble N. s. saturatus, but I follow Goodwin (1959:7).
Dalquest and Hall (1949:154) reported the specimen from eight kilometers northeast of Antiguo Morelos as from San Luis Potosí, from which state the collector (Dalquest) evidently thought it had originated. Actually the place eight kilometers northeast of Antiguo Morelos is in Tamaulipas.
Records of occurrence.—Specimens examined, 64: 6.5 mi. N, 13 mi. W Jiménez, 1250 ft., 14; Cueva de la Esperanza, 6 km. SW Rancho Santa Rosa, 360 m., 20; Sierra de Tamaulipas, 3 mi. S, 16 mi. W Piedra, 1400 ft., 7; 3 mi. S, 14 mi. W Piedra, 2; Ejido Ojo de Agua, 20 mi. N, 3 km. W El Mante, 300 ft., 20; 8 km. NE Antiguo Morelos, 500 ft., 1.
Additional records (Goodwin, 1959:8): Antiguo Morelos; El Pachón.
Myotis velifer incautus (J. A. Allen)
Cave Myotis
1896. Vespertilio incautus J. A. Allen, Bull. Amer. Mus. Nat. Hist., 8:239, November 21, type from San Antonio, Bexar Co., Texas.
1928. Myotis velifer incautus, Miller and Allen, Bull. U. S. Nat. Mus., 144:92, May 25.
Distribution in Tamaulipas.—Probably most of northern part of state; presently known only from three localities.
The two specimens examined from the Sierra de Tamaulipas were taken in a mist net in which Eptesicus fuscus, Myotis keenii, and Tadarida brasiliensis also were captured. Both are females, one of which was lactating (June 20). Specimens from San Fernando probably were taken in houses by natives, who brought the bats to the collectors (Clifton and Bodley). The maxillary tooth-row and tibia are shorter, breadth across M3 narrower, and ear slightly longer in Tamaulipan specimens than in those for which measurements were given by Miller and Allen (1928:95), but the Tamaulipan specimens do not differ otherwise. The color in general is slightly more brownish than in Texan incautus, but about as in Oklahoman specimens examined. Three from San Fernando, Tamaulipas, are darker than others from that state.