Family Cervidae _Odocoileus hemionus crooki_ (Mearns) 465 _Odocoileus virginianus miquihuanensis_ Goldman and Kellogg 466 _Odocoileus virginianus texanus_ (Mearns) 466 _Odocoileus virginianus veraecrucis_ Goldman and Kellogg 466 _Mazama americana temama_ (Kerr) 466 Family Antilocapridae _Antilocapra americana mexicana_ Merriam 467 ACCOUNTS OF SPECIES AND SUBSPECIES =Didelphis marsupialis= Opossum The opossum occurs throughout Tamaulipas but is commonest in the south, especially in the areas of tropical forest and along water courses. Most of the specimens examined were caught in steel traps baited with remains of small animals (mostly mammals and birds, but one trap was baited with the head of a black bass). At Villa Mainero five individuals were caught in one night in five of seven traps scented with spilogale musk. These traps were set in runways along a thick thorn-brush fence, which separated a cornfield from thorn-brush desert. Along the Río Purificación 36 kilometers north and 10 kilometers west of Victoria an opossum was eaten in a trap by a small carnivore, probably a felid judging from tracks around the trap. A female with 14 pouch young was taken in June in the Sierra de Tamaulipas and weighed 1350 grams; a March-taken female with nine small young in her pouch, from Soto la Marina, weighed 1800 grams. A male from the Sierra de Tamaulipas also weighed 1800 grams. =Didelphis marsupialis californica= Bennett 1833. _Didelphis Californica_ Bennett, Proc. Zool. Soc. London, p. 40, May 17, type locality restricted to Sonora by Hershkovitz (_infra_). 1951. _Didelphis marsupialis californica_, Hershkovitz Fieldiana-Zool., Chicago Nat. Hist. Mus., 31(47):548, July 10. _Distribution in Tamaulipas._--Southeastern part of state, north at least to Soto la Marina.