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Show 6 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. whole under surface is of a whitish colour, sometimes having a slight tint of orange towards the posterior parts, marbled with black. . . Var. C. In this variety the general colour JS dark brown, and the yellow or green longitu-dinal lines which characterize the former varieties are but slightly marked ; but the black spots unite and form irregular transverse bands. DIMENSIONS. Length of the head ....................... . oF the body ................. .. . of the tail ....... , ............... . Inches. Lines. 0 6 8 6 7 0 This specimen very much resembles in its more tangible characters, the Pr. tenuis; from which, however, it differs totally in the colouring, and in some measure also in the general form, which is more thick and robust. Found in Chile by M. Gay, from whence I also received specimens from Capt. King, and other sources.-" Valparaiso." Mr. Darwin. PnocTOTRETus BIBRONII. N.S. P.LATE III.-Fm. I. Capite squamis lcevibus, subconvexis; auribus ovalibus, margine anteriore unidentato; squamis temporttm collique rotundatis lcevibus irnbricatis; colli minintis ; serie unica squamarum s1tpralabiali1tm; squamis dorsi rlwmboideis, carinatis, postice acuminatis; abdominis squamis ornnibus intcgris; femontm facie posteriori omnino gmnulosd. Habitat, Port Desire. Mr. Darwin. DEscruPTION.-General form resembling that of Pr. pictus and C?Janogaster. Ilea<.l moderately short, obtuse, covered with rather large slightly convex scales; a single row of scales between the labial and the orbitar. The anterior margin of the ear has a sipgle tooth. The temples and the sides of the neck are covered with imbricated scales, which have no carina-those of the neck, especially those on the fold of the skin are smaller and more raised than the others. The scales of the back are rather large, rhomboidal, with a distinct carina, terminating in a point. Those of the abdomen and sides are all of them entire at the margin. The posterior surface of the thighs is wholly granular. The only specimen obtained being a female, the number of pre-anal pores is not known. The general colour of this species is brownish grey ; a black longitudinal line runs down the middle of the back and tail. There are two series of black spots on each side, and a |