. Bulletin - United States National Museum. Science. 243. Figs. 242-243.—Natrix tigrina. IJ X nat. size. 242, top of heap; , side of head. No. 7385 .M. side gradually becoming darker posteriorly, each ventral being marked basally with an increasing amount of dark slate color until the under- side posteriorly is nearly uniform slaty black. Dimensions. mm. Total length 682 Snout to vent 507 Vent to tip of tail 175 The young do not differ materially from the adults. Our largest specimen (No. 12711) measures about 935 mm. in total length, and probably few grow to be more than 1 meter in
. Bulletin - United States National Museum. Science. 243. Figs. 242-243.—Natrix tigrina. IJ X nat. size. 242, top of heap; , side of head. No. 7385 .M. side gradually becoming darker posteriorly, each ventral being marked basally with an increasing amount of dark slate color until the under- side posteriorly is nearly uniform slaty black. Dimensions. mm. Total length 682 Snout to vent 507 Vent to tip of tail 175 The young do not differ materially from the adults. Our largest specimen (No. 12711) measures about 935 mm. in total length, and probably few grow to be more than 1 meter in length. Variation.—The scale formula of this species is fairly constant. All the specimens examined and on record have 19 scale rows, a divided anal (except No. 33988), and seven supralabials (two of our specimens have only six on one side). Hilgendorf in a series of 40 found only one in which the two preoculars were fused into one, and all 26485—No. 58—07 18. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
