130 



1876. = Sub-family Jaculinx, Alston, Proc. Zool. Soc. London, 1876, S9 

 (Dipodidse). 

 Family Characters. — Teeth 18; i. \Zy; pm. J:^ ; m. |:f. Superior inci- 

 sors compressed, sulcate; premolar small ; molars rooted. Cervical verte- 

 brae unanchylosed (cf. Dipodidw). Cranial portion of the skull shorter 

 and broader than in Muridse. Auditory bulla; transverse (cf. Muridse), 

 without special development (cf. Dipodidse). Anteorbital foramen large, 

 rounded, with a supplementary nick, or additional foramen, at its lower 

 portion. Malar mounting the zygomatic process ef the maxillary to 

 eflfect suture with the lachrymal. Zygomatic- arch styloid, much de- 

 pressed. Trunk enlarged posteriorly, in correlation with the shortness 

 of the forelimbs and great elongation of the hind ones, especially of the 

 pes (cf. Muridx, except Gerbillinx') ; nevertheless, the pes with five per- 

 fect and separate metatarsals, and five functionally developed digits (cf. 

 Dipodidse, Pedetidse). Tail greatly exceeding the trunk in length (cf. most 

 Muridse), very slender, scant-haired (cf. Dipodidss, Peddidse). Progression 

 saltatorial. 



Genus Zapus Coues. 



1825. Meriones, Fr. Cuvier, Dents des Mamm., 1825, 187 (type. Not 



Meriones of Illiger). 

 1830. Jaculus, Wagner, Natiirl. Syst. Amphib., 1830, 23 (type. Not of 



Jarocki, 1821, nor of early authors).— rBaird, Mamm. N. Am., 



1857, 429.— Alston, Proc, Zool. Soc. Lond , 1876, 89. 

 1875. Zapus, Coues, Bull. U. S. Geol. Survey Terr.,.2nd ser., No. 5, 1875, 



253 (type). 

 Generic Characters. — Well developed cheek pouches, internal. Digits 

 of the hand five, the first rudimentary, with a flat, blunt nail; palms 

 naked, granular, and tuberculate. Digits of the foot five, all functional, 

 and with perfect claws and basal webs; sole naked throughout, the heel 

 smooth, the rest granular and tuberculate. Meatus of the ear capacious, 

 closed with large antitragal and tragal flaps. -Pelage coarse and hispid. 

 Size small; configuration modified from an ordinary murine shape; 

 physiognomy peculiar. 



Zapus hudsonius Coues. 

 Long-Tailbd Jumping Mouse. 

 1780. Dipus hudsonius, Zinmermann, Geog. Gesch., ii, 1780, 358, No. 268 

 (based on the long-legged mouse of Hudson's Bay, of Pennant).— 

 Boddaert, Elench. Anim., i, 1784, 115 (based on Zinmermann).— 

 Schreber, "Saug., 861, No. 6."— Fischer, Syn. Mamm., 1829, 

 3-10 (b-s-d on Z'-mcr-ni-r^. 



