=_Perognathus merriami merriami_= Allen: Merriam Pocket Mouse.--An individual taken in a trap in the dunes near Camp 2 constitutes the first record of this species from the barrier island of Tamaulipas. This pocket mouse seems to be uncommon on other barrier islands of the western Gulf of Mexico, for there is only one published report of its occurrence on Padre Island, Texas (Bailey, 1905:141). Other nearby stations of occurrence are Altamira, Tamaulipas (Hall and Kelson, 1960:477), Brownsville, Texas (Bailey, _loc. cit._), and 17 miles northwest of Edinburg, Texas (Blair, 1952:240). Specimen: sex?, 89040, skull only, Camp 2, July 10. =_Dipodomys ordii parvabullatus_= Hall: Ord Kangaroo Rat.--We found this species uncommon and confined in distribution to dunes, in which it was recorded as follows: an adult female was shot and two other individuals were seen at night on July 6 at Camp 1; three were trapped near Camp 1 on July 7; two were trapped at Camp 2 on July 10. Specimens (5): [F], 89041, 2 placental scars, 46 gm., Camp 1, July 6. Male, 89042, testes scrotal, 47 gm.; [M], 89044, 60 gm.; [F], 89043, 44 gm.; Camp 1, July 7. Sex?, 89045, skel. only, Camp 2, July 10. Our material does not differ significantly from specimens obtained by Hall and von Wedel at Boca Jésus María in March, 1950, which formed the basis for Hall's description (1951:41) of _D. o. parvabullatus_. This subspecies is presumably confined in distribution to the barrier island of Tamaulipas. Two immature specimens from Bagdad, Tamaulipas, were tentatively assigned by Hall (1951:41) to _D. o. compactus_, a subspecies known otherwise only from Padre Island, Texas. =_Neotoma micropus micropus_= Baird: Southern Plains Woodrat.--This species was noted only near Camp 1, where numerous houses were seen in stands of mesquite and prickly-pear cactus and an adult male (89046, 330 gm.) was taken on July 6. This species has not been reported previously from the barrier island of Tamaulipas. Our specimen is referable to the nominate subspecies and shows no approach to _N. m. littoralis_, a subspecies known only from the type locality at Altamira, Tamaulipas (see map, Hall and Kelson, 1960:684). =_Procyon lotor_= (Linnaeus): Raccoon.--A weathered skull and a broken humerus were found at Camp 2. The skull is being studied by Dr. E. L. Lundelius, who informs us that it matches a number of raccoon skulls found in archaeological sites along the Balcones Escarpment of Texas. Such skulls are larger than skulls of raccoons occurring today in Texas (_P. l. fuscipes_) and closely resemble skulls of raccoons (_P. l. excelsus_) presently confined in distribution to Idaho, eastern Oregon, and eastern Washington. Further details of this situation are to be reported elsewhere by Lundelius.