=======+===========+=============+==========+=============== | Number | | | Ratio: SEX | of | Snout-vent | Tail | snout-vent | specimens | length | length | to tail -------+-----------+-------------+----------+--------------- Male | 33 | 56.0±0.5[A] | 77.0±0.7 | 0.731±0.001 | | (49-62) | (69-85) | (0.682-0.817) -------+-----------+-------------+----------+--------------- Female | 14 | 50.9±0.5 | 62.2±0.9 | 0.825±0.001 | | (47-53) | (57-68) | (0.735-0.877) -------+-----------+-------------+----------+--------------- [Footnote A: Mean ± standard error; range indicated in parentheses.] =_Cnemidophorus gularis_= Baird and Girard: Whip-tailed Lizard.--At both camps we found this species in the same general habitat in which _Holbrookia_ occurred, but in numbers decidedly fewer than the latter. Specimens (4): 2 [F] [F] adult, 63489, 63490, Camp 1, July 7. 1 [M] adult, 63491, 1 [F] adult, 63492, Camp 2, July 9. We failed to take specimens of snakes on the barrier island, but tracks of snakes were noted on two occasions in dunes near Camp 1; one trail led into a burrow of a kangaroo rat. _Birds_ Unless otherwise indicated, specimens taken were not molting. For birds undergoing postnuptial or postjuvenal molt, the degree of advancement of the molt is indicated by recording the number of primaries of the old plumage that have not been dropped. For example, the designation "4 P old" signifies that all primaries except the distal four have been molted. Table 2 presents results of a strip census of birds along the strand, made by three of us from the moving truck on the morning of July 10. Birds characteristically found on sand near the surf were thus conveniently counted in accurate fashion. Birds not ordinarily found on the strand could not be treated this way; most were considerably less abundant than the eight most numerous species listed in Table 2. Over-all, the numbers of individuals listed are a good index of abundance of the Great Blue Heron and of the common charadriiform birds on the beach in early July. The Black Tern is an exception, however, and this is discussed in the account of that species on page 327. TABLE 2.--BIRDS[A] RECORDED ALONG 17 MILES OF BEACH[B] ON THE BARRIER ISLAND OF TAMAULIPAS