1915.] 



GENUS SCALOPUS. 



29 



B2010-103 



Fig. 4,— Snout of S. a. aquaticus (X 1 J) . In- 

 dividual referred to in fig. 2. 



B2009-103 

 Fig. 3.— Tail of 

 Scalopus aquati- 

 cus aquaticus 

 (Xl|).No.203190, 

 U.S.Nat.Mus., 

 Biological Sur- 

 vey collection; 

 from Woodside, 

 Montgomery 

 County, Md. 



broader than long (fig. 5). Fore toes and hind toes webbed. Claws 

 of fore feet broad, fiat, and heavy; those of hind feet relatively short 

 and weak (fig. 6) . Fur 

 dense, soft, silky, the 

 hairs nearly equal in 

 length, producing a vel- 

 vetiike pelage. Mammse 

 6: latero-pectoral, 1-1; 

 latero-abdominal, 1-1 ; 

 inguinal, 1-1. 



SJcelefal cliaracters. — Clavicle short and heavy, about 

 two-thirds as broad as long, penetrated antero-posteri- 

 orly through the center by a small circular foramen; 

 humerus heavy, about three-fourths as broad as long. 

 Pelvis narrow, bones of the opposite sides adjunct un- 

 der acetabula; two osseous bridges connect sacral ver- 

 tebrae with ischium and produce four large foramina 

 or openings, one in each of the angles formed by median lines of 

 acetabula and sacral vertebrae. Superior surface of last sacral ver- 

 tebra with a very 

 small, low, late- 

 rally flattened, 

 longitudinal proc- 

 ess. Osfalciforme 

 long, reaching to 

 proximal end of 

 terminal phal- 

 ange of first digit, 

 wider and rather 



sharply incurved S-— Forefoot of S. a. aquaticus (X IJ) 



at base, narrower and gradually tapering distally. 



Skull conoidal, flat, with relatively broad braincase, and consider- 

 ably constricted interorbitally. Mastoids 

 relatively heavy and prominent. Inter- 

 parietal short and narrow, somewhat ir- 

 regular in outline, but usually narrower 

 anteriorly. Frontal region flat, not much 

 sloping ; frontal sinuses swollen. Eostrun^ 

 relatively short; anterior ends of pre- 

 maxillse much thickened and extending 

 beyond nasals, forming an acute notch 

 anterior to nasals. Anterior nares open- 

 FiG. 6.— Hind foot of s. a. aquaticus ing forward. Zygomata moderately long 



(XIJ). Individualreferredtoinfig.2. ^^^^^ ^^^-^ ^^^^^^^ descending 



shghtly and slanting inward anteriorly, the posterior end well back 

 on squamosal. Foramen magnum oval, of moderate size. Infraorbital 



B2011-103 

 Individual referred to in fig. 2. 



B2012-103 



