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Show 1906.] IN MEXICAN LIZARDS. 333 field 3-3 is bordered by black bands enclosing a grey centre, which is more or less clearly subdivided by a darker central line, so that in all 7 or 8 pale stripes can be counted. In the oldest male the first stripe is broken up into a row of bluish spots owing to the black of the bordering fields joining across the stripe ; an arrangement which leads on the sides of the thorax to the formation of imperfect black, short cross-bars. In this respect this old male agrees with the old male from Lerclo, q. v. Two specimens from La Cruz, collected by Dr. Meek (63 and 76 mm.). Frenoculars present in one, absent in the other specimen. Collar composed of large scales, in the younger with granules on the sides of the edge. Humerus with 6 rows, the fifth continuous across the elbow with the main long row of much enlarged scutes of the forearm. Femoral rows 5, all unusually large, three of which continued to the knee. Tibia with 3 rows of scutes, and in the larger specimen with a small fourth row. Pores 15/16 and 17/18. Colour of under parts : Collar and throat flesh-colour to pink, sides of collar slightly mottled. Chest, abdomen down to the last ventrals and anus blue-black ; the same colour, but somewhat mottled on the thighs. Behind the thigh a white stripe. Upper parts : 3 pairs of bluish-white stripes and rather faint pale spots in the almost black fields. Mid-field 3-3 bordered by black bands enclosing a fourth pair of grey stripes, which are separated by a ventral streak, or row of black specks, indicating in all 8 stripes. Three specimens from San Juan, collected by Dr. Meek (57, 58, and 59 mm.). Frenoculars present in all. Collar composed of larger scales. Humerus with 6 rows. Forearm with enlarged scutes, none of which reaches beyond the proximal half of the arm. Femur with 5, 6, and 7 rows. Tibia with 3 rows and a small 4th on the fibular side. Pores 16 in all specimens. Throat pink, collar yellowish or mottled on the sides. Chest and abdomen black, gradually changing to flesh-colour towards the groins, which is also the colour of the preanal region of the whole under surface of the hind-limbs, tail, humerus, and forearm. Upper parts very dark, the fields I., II., and III. being nearly black, with only one row of faint pale spots in the first two fields. On the back are 8 pale bluish stripes, the third and fourth pairs being dull grey and the latter pair divided by a black central line. There is no doubt that the 13 specimens from Montemorelos, Garza Valdez, La Cruz, and San Juan are closely allied to each |