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Show 308 DR. nf GADOW ON EVOLUTION [Mar. 20, 0. HYPERYTHRUS Cope=smce« van Denburgh = beldingi Cope. 4 supraoculars. Collar composed of large scales, without granules ; the figure in Cope's posthumous work does not agree with his description, nor with the specimens in the British Museum. Posterior surface of forearm with very slightly enlarged granules. Femur with 6 irregular rows of scales. Pores 16 to 17. Length, a gravid specimen, 59 mm.; another 60 m m. Range from Diego County in California apparently through the whole of Lower California to Cape San Lucas, including Cedros Island, and the Island of San Jose in the Gulf. Coloration of under parts all white, with a slight blue tinge on the abdomen in the male. Upper parts striped, without any field-spots. In a female specimen (Brit. Mus.) the striation is the same as that of a C. sexlineatus from San Diego; there are three pairs of complete stripes with a faint central stripe. In a male specimen the third pair converges from the head backwards, forming an unpaired stripe from midback to tail; a unique case amongst Cnemidophorus with only 5 to 6 stripes, the third pair universally enclosing a broad mid-field. In the triangular short mid-field of this specimen is a very short whitish-grey faint mid-stripe from the head to the neck; fields uniformly dark grey to black. In most of its characters C. hyperythrus very closely approaches C. sexlineatus, which also occurs in Diego County. • DEPPEI-GTOUP . Definition.-Cnemidophorus with normally 3 supraoculars (about 10 per cent, with 4); collar composed of enlarged scales in several rows ; posterior surface of forearm covered with granules. This group is restricted in Mexico to the Atlantic and Pacific Tierra caliente, and contains three well-definable forms. Small, exceptionally up to 80 mm. in length, sharply marked wTith 7-11 pale stripes. Abdomen of adult male black. Collar and rest of under parts of female white : C. deppei (text-figs. 71 and 72).- From coast of Jalisco and Vera Cruz in the Tierra caliente inland up to 2000 feet, southwards through Central America (Nicaragua, Costa Rica) to Caracas in Venezuela. Concerning Island of Cozumel, see p. 316. Larger, up to 138 mm. Collar of both sexes black, in contrast with throat and chest. Abdomen whitish, chequered with blue: C. guttatus. A. Throat pale, whitish. Back with conspicuous white stripes on very dark ground, or the stripes are broken up into |