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Show REPTILES. 21 each side bluish gray, passing beneath into yellowish white • A scr1'es ofvery u· reg u1 ar t ransverse spots cr.o ss the ye.l low median portion of the back ' and there are others on th e Sl' de s ; an d t h esc two scnes becommg confluent on the tail, form ' with the yellow gro u nd, aI t ernatc h aI f rm· gs of ' the :wo ~olours. The upper .part of the le.gs has similar bands. The whole of the throat, belly, and mfenor surface of the hmbs and tall are yellowish white. There are numerous small blackish spots over these parts which are more distinct and linear on the throat, and becoming paler, smaller and round on the belly. DIMENSIONS. Length of the head ..... ..... .. ..... . .. . of the body .. .. .............. .. . of the tail. ....... . .......... .. .. . Total length .... .. Length of anterior extremity ..... .. . . of posterior extremity .... .. .. . Inches. Lines. 1 2 2 7 8 0 1 6 Taken at Port Desire, on the coast of Patagonia. DIPLOLJEMUS BIBRONII. Milti. PLATE XI. Squamis capitis planis; cauda cm'}Jore cum capite breviore. Habitat, Port Desire. DESCRIPTION.- Head thick and clumsy, longer than it is broad, muzzle obtuse, supra-orbital arches slightly elevated. Nostrils as in the former species, in size, form, and situation. Ears subtriangular, the margin simple. Neck considerably contracted, with a longitudinal fold on each side, and a distinct transverse fold on the throat. Body rather broad, slightly depressed, perfectly even, without any central crest or elevation. The tail is shorter than the head and body, slightly triangular at its base, tapering regularly to its extremity. Limbs of moderate length; the toes of each foot longer than in D. Bibronii, and those of the fore·feet more unequal, the third being the longest, then the fourth, the second, the fifth, and the first. The fore-legs placed against the side reaches to about two-thirds of the distance between the shoulder and thigh ; the hinder foot placed in the same manner reaches to the axilla. The scales of the head arc quite fiat, a character in which this species differs remarkabl.y from the form01·, although in their number and arrangement they are very similar. The oc~Ipital scale is flat and hexagonal. Between the labial scales and the suborbital, there are, m a ddi t1· 0n to the regular series of larger supralabial scales, at 1e ast t h rcc dI' S f m ct series of smaller ones; whereas in D. Dar-winii there is but one. The scales of the temples, the neck, the body, the limbs and the tail, are similar to those |