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Show 342 DR. H. G A D O W O N EVOLUTION [Mar. 20, In opposition to the essentially spotted variety of G. communis, the Ixtlan specimens retain a fair amount of their stripes. For instance, in the largest specimen the fourth pair is still retained; but the first and second stripes are mostly dissolved into white spots, in the way characteristic of C. communis. The throat is white, sometimes pink, or even with a strong brick-reddish tinge ; collar whitish ; body in the adult chequered, especially on the flanks. The thigh-stripe breaks up early. Tail beneath either reddish or bluish. Sierra de Nayarete.-Dr. Buller collected the five specimens in Ranchos, in the walls of corrals, on the eastern side of the Sierra, at an altitude of about 4600 feet, apparently in open, treeless surroundings. These are the specimens referred to in m y paper (Proc. Roy. Soc. 1903, p. 118) under C. bocourti, and as aberrantly coloured; but they belong undoubtedly to the G. communis. Supraoculars 4 ; collar composed of large scales; forearm with typical scutes. There is much individual variation in these few, probably all adult, specimens :- 85 m m . Stripes 1 and 2 broad and conspicuous, white ; stripe 3 narrow and complete; 4th pair narrow, somewhat zigzag, enclosing a black centre-field. The fields are black-brown, with very faint red-brown spots. There is an extra white line below stripe 1, extending from the ear towards the thigh ! Throat and collar pale, yellowish, with dusky mottling ! Chest and belly still yellow. Tail bluish beneath, 93 m m . Stripe 1 is nearly gone; stripes 2 and 3 are being dissolved into whitish spots; the 4th pair is still complete. Fields with large round yellow-brown spots in double rows. Throat and collar yellow, much mottled with black! Chest, belly, preanal region, and thighs yellow, chequered with black. 97 m m . Stripe 1 is lost, stripe 2 much broken up; stripes 3 and 4 still present. Large pale brown spots in the fields. Throat and collar mottled black and yellow ! Rest of under parts with much black and blue pigment, chequered with yellow. Tail bluish blaok. 98 m m . Stripes 1 and 2 are quite gone; only narrow traces of the others. With about 10 rows of large round yellow spots on a uniformly black ground. Under parts like the 97 m m . specimen. 98 m m . The 6 stripes are still well preserved, but getting dissolved into white spots. Two rows of pale spots in the bla,ckish first and second fields. The broad, unicoloured mid-field is bordered by black dots. General ground-colour olive-grey. Throat and collar yellowish white. Chest and belly much pigmented with black and blue. Tail red.-This male specimen was caught at a different rancho, and it is distinguishable from the previous four specimens by the presence of a frenocular, a very unimportant character. Presidio, south-east of Mazatlan in Sinaloa.-Presumably the |