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Show REPTILES. 7 small interrupted fascia of the same colour extends from the shoulder to the thigh. The belly is of an uniform dirty white. This species approaches considerably to Pr. cyanogaster in general form and habit and in many of its characters ; but it may ?e at once distinguished from it not only by its colouring, but by the absence of even the slightest appearance of a carina on any of the scales of the temples or of the sides of the neck. DIMENSIONS. Length of the head ...................... .. of tho body .................... . of the tail ....................... . Total length ..... . Length of anterior extremity ........... . of posterior extremity ........ . Inches. Lines. 0 6 I 6 3 4 5 0 6 7 Found by Mr. Darwin at Port Desire, in Patagonia. PnocTOTRETus TENUis. PLATE III.-Fm. 2. Capite squamis la::vibus, non imbricat£s; auribus magnis, margiue anteriore suhtuberculato ; serie unicd squarnarum supralabialium; temporibus squamis rotundatis, imbricatis; collo granuloso; sguamis do1'si pm·vis, obtusis, carinis minimis; squamis lateralibus exiguis, non imbricatis; facie posteriore femormn omuino g1·anulosa. Proctotretus tenui1, Bibr.l. c. p. 279. DESCRIPTION.- General form slender: head rather short and obtuse, covered with flattened smooth scales; anterior margin of the ears with one or more slight tubercles; temples covered with rounded imbricated scales, some of which are slightly carinated; sides of the neck, and above the shoulders granular; scales of the back small, slightly carinated, obtuse; those of the sides very small, very little imbricated; those of the belly small and smooth. The posterior surface of the thighs has no patch of imbricated scales, but is wholly granular. The colour of the two specimens brought home by Mr. Darwin is so much obliterated, that I am obliged to have recourse to the account given by Bibron of the colour and markings of this species: - "Les deux sexes du Proctotrete svelte n'ont pas lc meme mode de coloration. Ni l'un ni ]'autre ne portent, de chaque cote du dos, une bande longitudinale verte ou jaunatre comme cela s'observe dans l'espece precedente, (Pr. pictus.) "Le male a le dessus de Ia tete nuance de brun et de fauve, ou bien ponctue de jaunc et de noiratre. La region cervicale est, ainsi que le dos, verroiculee de noir sur un fond brun, |