1915.] 



SCALOPUS AQUATICUS TEXANUS. 



51 



Type locality, — Rockport, Aransas County, Texas. 



Type specimen. — No. fflf, Amer. Mus. Nat. Hist.; sex unknown; 

 skin and skull; collected September, 1887, by William Lloyd. 



GeograpJiic range. — Coast region of Texas from Matagorda Bay to 

 Cameron County, north in the interior to central and east-central 

 Texas. 



General clmracters. — Size small; much smaller, darker, and more 

 brownish than intermedius; back generally much tinged with bronze, 

 and nose and wrists suffused with orange; skull small, flat, much 

 depressed postorbitally, and swoUen supraorbi tally; rostrum short; 

 teeth large. 



Color. — Full winter pelage: Back Saccardo's umber to mummy 

 brown with bronze tinge; nose and mists zinc orange to xanthiae 

 orange; underparts much like back, less bronze, occasionally tinged 

 with amber-brown; base of hairs dark mouse gray dorsaUy, becom- 

 ing slightly paler ventraUy. Fresh summer pelage: Slightly paler 

 than winter pelage, less brown, with less orange on nose and wrists; 

 underparts distinctly more grayish than in winter pelage. 



SJcull. — Small, flat, constricted interorbitaUy, much depressed 

 postorbitally, and swollen supraorbitally; rostrum short; mandible 

 relatively heavy; teeth relatively large. The skull of S. a. texanus 

 is very much smaller than that of S. a. intermedius or 8. a. pulclier; 

 about the size of that of S. a. australis but differs from it in shape and 

 in having much heavier mandibles and dentition. 



Measurements. — Average of 8 adult males from type locality: 

 Total length, 138.5 (128-152); tail vertebra, 23.8 (21-26); hind 

 foot, 17.2 (15.5-18). Average of 4 adult females from, type locality: 

 133.8 (130-137); 22.3 (20-24); 16.3 (15-17). Shull: Average of 9 

 skuUs of adult males from type locality: Greatest length, 31 (30-32) ; 

 palatilar length, 13 (12.7-13.7); mastoidal breadth, 16.6 (16.1-17); 

 interorbital breadth, 6.8 (6.6-7.1); maxiUary tooth row, 10.3 

 (10-10.6); mandibular molar-premolar row, 10.1 (9.7-10.3). Aver- 

 age of 4 skulls of adult females from type locality: Greatest length, 

 29.8 (29.3-30.2); palatilar length, 12.6 (12.3-12.8); mastoidal 

 breadth, 16.2 (15.9-16.5); interorbital breadth, 6.9 (6.7-7.1); max- 

 illary tooth row, 9.8 (9.7-9.9); mandibular molar-premolar row, 

 9.7 (9.5-9.9). 



Remarks. — Local variation in the genus seems to reach its maxi- 

 mum in S. a. texanus, there being no two localities from which speci- 

 mens of this form have been examined but exhibit differences either 

 in skin or cranial characters, or in both; there is, however, very little 

 individual variation in a series from any one locality. Unfortunately, 

 no considerable number of specimens are available except from Rock- 

 port, Tex., and until extensive series of specimens and careful habitat 



