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قراءة كتاب Two New Moles (Genus Scalopus) from Mexico and Texas
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Two New Moles (Genus Scalopus) from Mexico and Texas
collected in or near Aransas County in 1887 and see no reason for doubting that the locality, Presidio County, as written on the original label of the type of S. a. texanus is correct. Mr. M. J. Carroll of the Texas State Historical Association advises me that in 1887, Presidio County was reduced to its present size by the creation of Brewster and Jeff Davis counties. Lloyd might have taken the mole in any one of these three Trans-Pecos counties. Even so, these counties are widely separated geographically from the range of other moles designated as S. a. texanus (see Davis, Amer. Midl. Nat., 27:386, March, 1942). The taking of S. montanus in the Sierra del Carmen immediately south of Trans-Pecos Texas leads me to think that Lloyd's mole might have been taken in a mountainous region within one of the three counties mentioned above. A description of Scalopus aquaticus texanus Allen follows:
Scalopus aquaticus texanus Allen
Scalops argentatus texanus Allen, Bull. Amer. Mus. Nat. Hist., 3:221, April 29, 1891.
Type.—Sex unknown, adult, skin no. 3488, skull no. 2740, Amer. Mus. Nat. Hist.; Presidio County, Texas; September, 1887, obtained by Wm. Lloyd.
Range.—Limits of range in Trans-Pecos Texas unknown.
Diagnosis.—Size small; rostrum heavy and broad; lower jaws heavy; palatine space wide with upper tooth-rows arched laterally; teeth large, especially fourth premolar and molars.
Comparison.—From adults of comparable age from Rockport, Aransas County, Texas, S. a. texanus differs in: Rostrum broader and heavier; lower jaws heavier; palatine space wider, with upper tooth-rows more arched laterally; individual teeth in both jaws larger, especially fourth premolar and molars. From S. a. intermedius, which is geographically nearest to the northeast (adult specimens from Meade, Clark and Barber counties, Kansas, and Dewey County, Oklahoma), S. a. texanus differs in: Size smaller; rostrum less massive and shorter; tooth-row shorter.
Remarks.—The type has been previously examined by True (op. cit.:44). The skin is faded and of little taxonomic worth. The anterior part of the skull is present along with both upper tooth-rows and most of the lower jaws. The teeth are well worn, indicative of old adulthood. In size, S. a. texanus appears closest to moles from southern Texas (Rockport) which previously were assigned to the subspecies Scalopus aquaticus texanus. The tooth-rows are of the same length, but the individual teeth of S. a. texanus are significantly larger.
The moles in southern Texas previously ascribed to Scalopus aquaticus texanus seem to be without a name and may be known as follows:
Scalopus aquaticus alleni new subspecies
Scalops texanus, Allen, Bull. Amer. Mus. Nat. Hist., 5:200, August 18, 1893.
Scalops aquaticus texanus True, Proc. U. S. Nat. Mus., 19:21, December 21, 1896.
Scalopus aquaticus texanus Jackson, N. Amer. Fauna, 38:50, September 30, 1915; Miller, U. S. Nat. Mus., Bull. 128:15, April 29, 1924; Davis, Amer. Midl. Nat., 27:386, March, 1942.
Type.—Male, adult, skin no. 7189, skull no. 5788, Amer. Mus. Nat. Hist.; Rockport, Aransas County, Texas; 29 January 1893; obtained by H. P. Attwater.
Range.—Southern Texas, north to Bexar County and east to Refugio County (see Davis, loc. cit.).
Diagnosis.—Size small; according to Davis (loc. cit.), "... length of hind foot seldom more than 19 mm.; total length seldom more than 140 mm. Skull small and flat, seldom exceeding 33 mm. in occipitonasal length and seldom equalling 10 mm. in depth; maxillary breadth