Part 21 (1/2)

Hooper (1953:8) and Ingles (1959:395) reported _O. melanotis_ as caught at the edges of cane fields.

=Oryzomys melanotis carrorum= Lawrence

1947. _Oryzomys rostratus carrorum_ Lawrence, Proc. New England Zool. Club, 24:101, May 29, type from Rancho Santa Ana, about 8 mi. SW Padilla, Rio Soto la Marina, Tamaulipas.

1959. _Oryzomys melanotis carrorum_, Hall and Kelson, The Mammals of North America, 2:560, March 21.

_Distribution in Tamaulipas._--Southeast part of state; known only from the type locality and the Sierra de Tamaulipas.

The original description of this subspecies was based on three specimens collected at Rancho Santa Ana. Specimens examined from the Sierra de Tamaulipas extended the known range 45 miles southeast of the type locality, and also extend the previously known alt.i.tudinal range of 300-350 feet elevation to 1200 feet.

Specimens examined correspond in color and measurements to those recorded by Lawrence (1947:102-103). Of 12 specimens studied, the tympanic bullae of six touch the surface of the table when the skull rests on the tips of the incisors and the occipital condyles. In the other six the bullae are 0.3 to 1.3 mm. above the table top. The mesopterygoid s.p.a.ce in the specimens examined are broad and U-shaped and not V-shaped as in the three specimens examined by Lawrence (_op.

cit._). Weight of six males was 52.5 (48-63) and of four females 44.7 (40-49) grams.

_Measurements._--Average and extreme measurements of six males are as follows: 255.3 (240-269); 135.7 (120-147); 135.7 (120-147); 30.4 (30-31); 21 (20-22); greatest length of skull, 31.6 (30.9-32.5); zygomatic breadth, 15.3 (14.7-16.1); interorbital constriction, 4.8 (4.5-5.1); breadth of skull, 31.6 (30.9-32.5); length of nasals, 12.9 (12.4-13.4); length of anterior palatine foramina, 5.5 (5.2-5.7); length of palatal bridge, 6.1 (5.8-6.4); length of maxillary tooth-row, 4.0 (3.9-4.1). The females average slightly smaller.

_Records of occurrence._--Specimens examined, 12 from Sierra de Tamaulipas, 10 mi. W, 2 mi. S Piedra, 1200 ft.

Additional record: Type locality (Lawrence, 1947:102).

=Oryzomys melanotis rostratus= Merriam

1901. _Oryzomys rostratus_ Merriam, Proc. Was.h.i.+ngton Acad.

Sci., 3:293. July 26, type from Metlatoyuca, Puebla.

1953. _Oryzomys melanotis rostratus_, Hooper, Occ. Papers Mus. Zool., Univ. Michigan, 544:8, March 25.

_Distribution in Tamaulipas._--Extreme southeastern part of state, in tropical area.

Ingles (1959:395) reported one specimen from two miles north of Ciudad Mante as _O. melanotis_; here it is referred to _O. m. rostratus_ on geographic grounds.

_Records of occurrence._--Specimens examined, 2: 2 km. W El Carrizo, 1; Rancho Pano Ayuctle, 25 mi. N El Mante and 3 km.

W Highway, 1.

Additional records: 2 mi. N Cd. Mante (Ingles, 1959:395); Altamira (Goldman, 1918:54).

=Oryzomys alfaroi huastecae= Dalquest

1951. _Oryzomys alfaroi huastecae_ Dalquest, Jour.

Was.h.i.+ngton Acad. Sci., 41:363, November 14, type from 10 km.

E Platanito, San Luis Potosi.

_Distribution in Tamaulipas._--Known only from Rancho del Cielo (Hooper, 1953:8).

=Oryzomys fulvescens=