238 Bangs Mammals from Hamilton Inlet, Labrador. 



chest, and about vent. Feet, hands, and tail dull gray, hairy. Tail with 

 a long pencil nearly equaling length of tail. 

 Measurements. The three specimens measured as follows : 



No. Sex. Total length. Tail vertebrae. Hind foot. 



4166 c? old. 150 21 20 



4167 c? yg- ad. 145 22 22 



4168 (J' yg- 128 16 20 



Skull The skull of 4166, tf old adult, measures : basal length, 28.6 ; zy- 

 gomatic breadth, 19.8; mastoid breadth, 14.2; alveolar length of upper 

 molar series, 7.6; incisive foramen, 5.6. That of an adult male D. tor 

 quatus from Petschora, Russia (No. 3621, collection of Gerrit S. Miller, Jr.), 

 measures: basal length, 27.4; zygomatic breadth, 19; mastoid breadth, 

 14; alveolar length of upper molar series, 7.4; incisive foramen, 6.8. 



These specimens are of approximably equal age, so that they furnish a 

 very satisfactory basis for comparison. The skull of D. torquatus, though 

 actually slightly smaller, gives the impression of greater strength and 

 massiveness. This is chiefly due to its broader, less deflected rostrum and 

 slightly shorter, broader brain case. While the width of rostrum is less 

 and the deflection of dorsal outline greater in D. hudsonius, the rostral 

 depth at the root of the zygoma is slightly greater in D. torquatus. Au- 

 dital bullse in D. hudsonius distinctly larger and less globular than in 

 D. torquatus. 



Teeth. As has recently been pointed out,* there is a minute supple 

 mental anterior internal loop in the posterior lower molar of Dlcrostonyx 

 hudsonius which is apparently absent in the Old World species. Other 

 wise the dentition calls for no special comment. 



Synaptomys (Mictomys) iiinuitus (True). 



Only one specimen was collected. Dr. C. Hart Merriamand Mr. Gerrit 

 S. Miller, Jr., have kindly compared this specimen with the type of in- 

 nultus from FortChimo, Labrador, with the following results: The Ham 

 ilton Inlet specimen is younger than the type of innuitus, but is larger, 

 the hind foot measuring 3 mm. more and the skull being actually larger; 

 the tail is also longer. It is a pity that only one specimen from each 

 locality is in existence, as more material from Labrador would probably 

 show that two well marked forms occur there, as is the case with Ecotomys 

 and probably with Phenacomys ungava also. The measurements of the 

 specimen, No. 3972, $ young adult, are : total length, 114; tail vertebrae, 

 25 ; hind foot, 21 . 



Miller, North American Fauna, No. 12, p. 39, foot-note, July 23, 1896, 



