=_Agelaius phoeniceus megapotamus_= Oberholser: Red-winged Blackbird.--This species was recorded only at Camp 1 on July 7, when we saw two males, one of which was flying south along the edge of the dunes in a flock of five Great-tailed Grackles. Specimen: [M], 38992, testis 10 × 7 mm., fat, 54 gm., Camp 1, July 7. The large size of the testes of this individual indicates breeding condition. =_Sturnella magna hoopesi_= Stone: Eastern Meadowlark.--Meadowlarks were found in small numbers along the margins of the alkaline flats at both camps. Breeding was still in progress, for males were singing and a female shot on July 9 had only recently laid eggs. Specimens (2): [M], 38986, testis 13 × 8 mm., not fat, 102 gm.; [F], 38987, ova to 6 mm., 3 collapsed follicles, not fat, 88 gm.; Camp 2, July 9. =_Richmondena cardinalis canicaudus_= Chapman: Cardinal.--This species was recorded only in stands of mesquite near Camp 1, as follows: July 7, two pairs seen, from which a breeding female was taken; July 8, three birds seen. Specimen: [F], 38933, edematous brood patch, 36.5 gm., Camp 1, July 7. Intergrades between the present subspecies and _R. c. coccinea_ of Veracruz are reported from Altamira, Tamaulipas (Mexican Check-list, 1957:329). _Mammals_ =_Dasypus novemcinctus mexicanus_= Peters: Nine-banded Armadillo.--Remains of an armadillo (89017) were found in a mesquite thicket in the dunes near Camp 1 on July 7. The bones are not badly weathered and were not embedded in sand. This species has not been recorded previously on the barrier island of Tamaulipas, nor, for that matter, on any of the barrier islands on the western shore of the Gulf of Mexico. =_Lepus californicus merriami_= Mearns: Black-tailed Jackrabbit.--From two to four individuals were recorded daily in dunes and on alkaline flats in the vicinity of stands of mesquite and cactus. Specimens (2): [F] adult, 89018, pregnant (two embryos, 28 mm. in crown-rump length), Camp 1, July 6. Male immature, 89019, Camp 1, July 7. Our specimens have been compared with two skins of _L. c. curti_ from the type locality at Eighth Pass, with which they agree reasonably well in color. The size of the adult female is about that characteristic of other specimens of adult _L. c. curti_, but characters of the skull are consistent with those of _L. c. merriami_. A specimen of this species from Matamoros and several from Brownsville, Texas, have been assigned by Hall (1951:43) to _L. c. merriami_. Specimens from Padre Island, Texas, reportedly resemble _L. c. curti_ in smallness of the tympanic bullae but are in other characters referable to _L. c. merriami_ (Hall, 1951:44).