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Show 1906.] IN MEXICAN LIZARDS. 373 2 and 3 are still present, but grey ; fields still with double rows of numerous spots ; throat mottled. Cope, who had many specimens from the Colorado River, adds that the young have two pairs of narrow stripes, that the fields between them show a row of pale spots, and that the thorax is not black. The adult he describes as having about 14 rows of grey-yellow spots on grey-olive ground. In colour and pattern of the upper parts, this species strikingly resembles the C. scalaris of the C. gularis-group; on the other-hand, the mottled throat of the Ft. Lowell female and the dorsal striation show that C. melanostethus is a smaller and nigrescent form closely allied to C. tessellatus. CNEMIDOPHORUS MARTYRIS Stejneger = cethiops Cope. From San Martyr Island in the Gulf of California, and from Hermosillo in Sonora. Length 82 m m. Humerals 4-5 ; femorals 6-7 ; pores 20-21. Immature, or females ? : with 7 narrow stripes, which are a little paler than the ground-colour ; fields obscurely spotted, but one of the females has the fields spotless and black; under parts white, throat and collar dusky. Old specimens are black above and below, except the hind limbs and the ventral line of the tail. The posterior side of the thighs is marked with three black longitudinal stripes. The following two species are based upon very insufficient material, possibly young specimens. They belong without any doubt to the tessellatus-group. CNEMIDOPHORUS OCTOLINEATUS Baird. The single specimen, from Pesqueria Grande in Nuevo Leon, measures 60 m m . Bluish olive, darker above, lighter below ; with 8 pale narrow stripes of the same tint; without any spots on body, tail, or limbs. Humeral rows of scales 5, femorals 6, tibials 3. Pores 17. Scales of the back depressed. CNEMIDOPHORUS INORNATUS Baird. Two specimens, from Pesqueria Grande, Nuevo Leon, of 56 m m. Uniform dark olivaceous above, pale olivaceous below ; without spots or stripes. Scales of the back tubercular and elevated. Humerus with 6 rows. Femur with only 4 or 5 rows according to Cope, but I count 6 very regular rows in the figure on p 591 Pores 16-17. I am inclined to think that these are very young specimens. Cope remarks that "it is the smallest species, and yet shows no indication of stripes." However, in very young examples of C. guttatus, the spotted and dull-coloured forest-variety of G. immutabilis, the stripes are frequently at first so very faint that they are visible only in certain lights, and they appear only later as stripes, soon to be broken up and to partly vanish again. 25* |