REVISION OF THE JUMPING MICE OF THE GENUS ZAPUS. 13 



specimens taken on Lulu Island, near the mouth of Fraser River, a 

 well marked form inhabiting the Pacific coast region from Fraser 

 River, British Columbia, to Humboldt Bay, Calif. 



Genus ZAPUS Coues. 



Dipns Zimmermaun, Geog. Geschichte d. Menschen u. vierfiissigen Thiere, II, p. 358, 



1780. 

 Gerbillus Rafmesque, 'Precis des Decouv. somiologiques, p. 14, 1814'. (Not Gerbillus 



Desmarest, 1804.) 



Meriones F. Cuvier, Dents des Manim., pp. 187, 256, 1823. (Not Merionea Illiger, 1811.) 

 Jaculus Wagler, Nat. Syst. Amphibien, p. 23, 1830. (Not Jaculus Erxlebeu, 1777.) 

 Zap us Coues, Bull. U. S. Geol. Surv. Terr., I, 2d ser., No. 5, p. 253, 1875. 



Characters. Skull not massive; brain case rather high and rounded; 

 antorbital foramen large and oval; zygomata not widely spreading, 

 broadly expanded anteriorly where the malar extends upward to the 

 lachrymal. Teeth 16 or 18 (upper premolar present or wanting); 

 enamel much folded; upper incisors compressed, much curved, deeply 

 snlcate, and deep orange. 



Body enlarged posteriorly; hind legs and tail greatly developed, the 

 latter much exceeding length of head and body. Tail slender, uni- 

 formly tapering. Toes of hind foot five, each with separate metatarsal. 

 Upper parts ochraceous; median dorsal band dark. Under parts 

 white (often suffused with ochraceous); one species with brown ventral 

 stripe. 



KEY TO THK SUBGKNERA OF ZAPUS. 



Vremolar present: 



Eiiamel folds closely crowded; tail not tipped with white; ears rather Jong; 



lower parts white or ochraceous Zapua 



Enamel folds not crowded; tail tipped with white; ears rather short; lower 



parts white with brown ventral stripe Eozapus 



Premolar absent : 



Enamel folds closely crowded ; tail tipped with white; ears rather long ; lower 

 parts white Napceozapus 



LIST OK SPECIES AND SUBSPECIES, WITH TYPE LOCALITIES. 



Subgenus Zapus. 



Zapus alascensis. Yakutat, Alaska. 



alleni. Pyramid Peak, Lake Tahoe, California. 



americanus. Philadelphia, Pennsylvania. 



campestris nob. Bear Lodge Mountains, Wyoming. 



hudsonins. Hudson Bay. 



laclns, Kigoulette, Hamilton Inlet, Labrador. 



major nob. Warner Mountains, Oregon. 



minor nob. Wingard, Saskatchewan. 



monianns. Crater Lake, Mount Mazama, Oregon. 



nei-adensis nob. Ruby Mountains, Nevada. 



orarins nob. Point Reyes, California. 



oregonus nob. Elgin, Oregon. 



pacificus. Prospect, Rogue River Valley, Oregon. 



princeps. Florida, La Plata County, Colorado. 



saltator. Telegraph Creek, Northwest Territory. 



tenelli<8. Kamloops, British Columbia. 



trinotattts. Lulu Island (month Fraser River), British Columbia. 



