1915.] 



SCALOPUS AQUATICUS PULCHEK, 



47 



sepia, showing much blackish plumbeous of base of hairs, Tl'orn 

 winter pelage: Above fuscous or ohve-bro^Ti, usually tinged on 

 head with mummy brown or Saccardo's umber; underparts dark 

 neutral gray, becoming paler anteriorly, tinged with bister. Fresh 

 summer pelage: Upperparts oHve-bromi shading into coppery seal 

 brown on head and face; nose and wTist-s slightly tinged with ochra- 

 ceous-orange ; beneath, bright cimiamon, becoming grayish poste- 

 riorly. 



Shdl. — Somewhat similar to that of S. a, aguaticus, hut sUghtly 

 larger, less angular, with flatter braincase, and averaging wider inter- 

 orbitally and through mastoids; postorbital region less depressed 

 than in aguaticus, zygomata heavier posteriorly, and horizontal ramus 

 of mandible more arched ventrally; no distinct secondary process on 

 posterior margin of coronoid process, though central portion of pos- 

 terior border of ascending ramus is sometimes shghtly expanded 

 posteriorly. 



Measurements. — Average of 6 adult males from type locality: 

 Total length, 155.9 (153-170); tail vertebrae, 25 (23-29); huid foot, 

 22 (21-23). Average of 3 adult females from type locahty: 149.3 

 (146-156); 23.3 (20-25); 21 (20-22). STcull: Average of 7 skulls of 

 adult males from type locahty: Greatest length, 35.6 (34.7-37.4); 

 palatilar length, 14.7 (14.2-15.4) ; mastoidal breadth, 18.2 (17.6-19.2); 

 interorbital breadth, 7.8 (7.5-8.2); maxillary toofch row, 11.3 

 (11-11.7); mandibular molar-premolar row, 11 (10.8-11.5). Aver- 

 age of 3 skulls of adult females from type locahty: Greatest length, 

 34.3 (34.1-34.6); palatilar length, 14.3 (14.2-14.4); mastoidal 

 breadth, 18 (17.5-18.3); interorbital breadth, 7.7 (7.4-8); maxil- 

 lary tooth row, 10.9 (10.7-11); mandibular molar-premolar row, 

 10.7 (10.6-10.8). 



Remarlcs, — Like other members of the genus, this beautiful mole is 

 subject to shght local variations throughout its range. Specimens 

 from Grand Coteau and Clarks, La., are somewhat smaller than the 

 typical form; one from Clarks is unusually grayish for the form, but 

 the much-worn fur and the partial molt may account for the color. 

 The very few not immature in a series from Mer Eouge, La., are 

 much alike in color, but are not so richly colored as most specimens 

 of S. a. pulcher; skulls of males, however, show the greatest individual 

 variation observed in any series from a single locahty; two skulls 

 are indistinguishable from topotype skulls of pulcher; two others 

 are long, narrow, high, and rotund, and have narrow rostra; another 

 is short, broad, and flat, and has a broad rostrum; age may possibly 

 accoimt for some of the variation, and mcorrect sex determinations 

 may also be partly responsible. An old male from Lake Cit}^, Ark., 

 is in some respects intermediate between pulclier and S, a. machri- 

 noides; the teeth are large; the mastoids almost as heavy as those 



