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Show 1879.] MR. P. L. SCLATER ON A NEW HUMMING-BIRD. 145 interrupting the continuity of the bony palate. Each of the two anterior upper molars with two pairs of enamel folds, those of each pair meeting interiorly and forming a kind of fork. Enamel folds of the anterior lower molar more irregular ; the second with three folds, the two anterior forming a loop1. Dentition of Thrinacodus cdbicaud-a. THRINACODUS ALBICAUDA. (Plate X.) Fur along the back of uniform softness and length, the longest hairs being about an inch long; lower parts covered with shorter, but likewise soft and dense fur. Bright reddish-brown above, the longest hairs being black towards the extremity ; roots of the hairs grey. Lower parts white. Basal half of the tail like the back, terminal half white, with a greyish tinge towards the extremity. millim. Length of head and body 150 Length of tail 255 Length of sole of fore foot 20 Distance between heel and extremity of middle toe . . 38 Length of skull 40 Distance between the incisor and first molar 8 Length of first upper molar 4*5 Width of first upper molar 4 February 18, 1879. Prof. W. H. Flower, LL.D., F.R.S., President, in the Chair. The Secretary exhibited, on behalf of the Rev. F. O. Morris, an example of Bombyx quercus with the antennae malformed, being much smaller than the ordinary size. Mr. Sclater laid before the Meeting an example of a Hummingbird obtained at Guajango, in Northern Peru, by Messrs. Stolzmann 1 Only the two front molars above and below have been preserved; the third, which was still in an undeveloped condition, is lost. But it is not likely that in the adult dentition the breadth of the molars would be diminished. PROC. ZOOL. Soc-1879, No. X. 10 |