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Show 332 DR. H. GADOW ON EVOLUTION [Mar. 20, It is important to note that San Juan lies close to, and between, Monterey and Montemorelos, from both of which places some of Cope's C. gularis gularis are said to have been received; and that he mentions Monterey specimens as having the low number of pores. To judge from the specimens described below, it seems to me that this is the critical district in which the change from the typical gularis into the slightly more southern var. meeki is taking place. This can be settled definitely only by examination of the specimens in the Smithsonian Institution. The following specimens I distinguish as C. gularis, var. meeki:- Two specimens from Montemorelos, collected by Dr. Meek.- One 62, the other (male) 65 m m . in length, agree in coloration and pattern with the typical var. meeki, but the collar is distinctly weaker, the scales decreasing rapidly towards the sides. There is only a nest of moderately large scutes on the forearm ; the scutes being distinctly less developed than in the San Juan specimens. Humerus with 6 rows of scales, all rather large. Femoral rows 5 to 6 irregular in one. 6 to 7 irregular in the other, o* with 16/15, the smaller specimen with 19/20 pores. The frenocular is present in one, absent in the other. Six specimens from Garza Vcddez, collected by Dr. Meek.- 60-75 m m . in length ; two females with eggs measure 64 and 68 m m . Consequently a decidedly small kind of lizard. Frenoculars present in 3, absent in 3 specimens. Collar composed of large scales, except in one specimen in which the scales are rather small; rarely with a few scattered granules on the posterior edge. Humerus with only 5 or 6 rows of scales, which, in conformity with their small number, are all rather large. One or two of the last rows are continued upon the forearm's posterior side. Forearm : front with 2|, rarely 3 rows of scutes. The posterior surface is covered with at least one row of very large scutes. Femur with 6 rows of scales, of which three extend down to the knee. Tibia with 3 rows of scutes, with sometimes a small fourth on the fibular side. Pores : 4 specimens with 15/16, one with 17/18, one with 19/19. Coloration of under parts : Throat bluish white in young and in females ; in males with a pink tinge and faintly mottled with bluish pigment on the sides. Collar white, but mottled on the sides in the males. Chest and abdomen in young and females white, suffused with bluish on the sides; this suffusion increases in males first on the chest and then spreads backwards, until in the old males all the under parts inclusive of the arms and thighs are uniform black. Under surface of tail and tibia uniformly yellowish white.-Upper surface with 3 pairs of white or bluish-white stripes. The fields are nearly black, with rather faint bluish or whitish spots in the first and second fields. The mid- |