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Show 1906.] IN MEXICAN LIZARDS. 331 The size of these lizards is not mentioned, except that " the size of the adults exceeds a little that of the Eastern form [C. sexlineatus], a specimen from Arizona measuring 100 m m. This is, however, larger than the average." According to Cope, C. gularis gularis is found in Western Texas, N e w Mexico, and Arizona, and in Mexico as far south as Chihuahua and Monterey. A locality almost at sea-level is Mata-moros, near the mouth of the Rio Grande. Cope mentions it especially as inhabiting the Staked plains of Texas. Tucson and Fort Lowell in Arizona, Chihuahua, Monterey, are all situated in flat, practically treeless plains. Only a few specimens examined by myself agree with the typical C. gularis gularis. They are the following :- I. British Museum: 6 specimens from Fort Lowell, Arizona, and from Duval County, Texas. 1 Length. 1 (mm.) 1 Fort Lowell (2). Duval Co., Texas. 35 35 53 77 62 67 65 Very young form. Collar. Row of large scales. Edge formed by row of granules. Larger scales. " 33 Forearm. Large polygones. Enlarged polygones. Large scutes. 33 35 Pores. 15 18 17 Numerous sharp white specks in the stripes, indicating change towards C. communis. Field-spots. Faintest field-spots. 3 pairs of stripes and sub- i divided mid-field. Field-spots. 4 complete pairs of stripes. Brown spots in fields I. and II. Already with 4 pairs of stripes, 4/4 enclosing an island. II. One of four specimens, taken by Dr. Meek at San Juan, south of Monterey, agrees with the typical gularis, and contrasts considerably with the three others in size and arm-scaling. It is a female of 72 m m . Without frenoculars. Posterior surface of forearm with a short row of large scutes. Femoral rows 6. Pores 17. Throat and collar pink. Chest and abdomen white, suffused with bluish green. Upper surface with 7-8 pale stripes ; the normal three pairs being white, but the mid-field is sharply marked by a black band against the median side of each third stripe, and the resulting grey central region is imperfectly divided by a row of black dots in the mid-line. A row of rather large, but ill-defined pale spots in the first and second fields. The posterior thigh-stripe is partly broken. This specimen indicates, by the pink throat and by the subdivision of the mid-field 3-3 into a 4th pair of stripes, a tendency which becomes preponderant in the lizards which are found to the south of the home of the typical gularis. |