11-2 SCIUROPTERUS. HAPLODONTIA. 



lar, broad posteriorly, no postorbital processes; zygomata widest pos- 

 teriori}'; anteorbital foramen oval, obliquely placed; nasals broad; 

 mandible heavy, strong, descending ramus twisted into the hori- 

 zontal plane; coronoid falcate. 



42. *Hai)lodoiitia. 



I ~i; P- T~' M- i=^; = 22. 



Aplodontia! Rich. Zool. Jour., iv, 1829, p. 334. Type A. leporina. 

 Rich. = Anisonyx nifa. Rafin. 

 Anisonyx, Rafin. Am. Month. Mag., 1817, p. 45. (Part.) 

 Molars rootless, prismatic, pattern unique, with a prominent 

 salient angle having a cavity on either side, this angle being external 

 on upper molars, internal on the lower. Molar series nearly parallel; 

 first upper premolar very small; incisors rounded anteriorly; palate 

 broad, of about equal width throughout its length. Auditory bulla; 

 small, with tubular meatus projecting beyond posterior angle of the 

 zygoma. Superior outline of skull flat; base horizontal. 



143. rufa. {Anisonyx), Rafin. Am. Month. Mag., 1817, u, p. 45. 



leporina. Rich. Faun. Bor. Amer. , 1829, p. 211, pi. 18C. Skull 

 and feet. 



Type locality. Cascades of Columbia River. 



Geogr. Distr. Eastern Washington and Oregon. 



Color. Above chestnut or reddish brown; beneath plumbeous; 

 feet and ears whitish. Tail like back. 



Measurements. Total length, 305; tail vertebras, 25; hind foot, 54. 



a.^californica. {Haplodontia), Peters, Monstab. K. P. Akad. Wis- 

 sench. zu Berlin, 1864, p. 179. 



major. Merr., Ann. N. Y. Acad. Scien., 1886, iii, p. 316. 



Type locality. California. 



Geogr. Distr. California, range not defined. 



Color. Above grizzled grayish brown; under fur plumbeous; 

 rump and belly grizzled mouse gray; patch of white on anal region; 

 sooty brown stripe from nose to between eyes. 



Measurcmi-nts. Length of head and body, 340; hind foot, 53; 

 ear, 10. 



6. — raineri. {Aplotlontia.'), Merr., Proc. Biol. Soc. Wash., 1899, p. 21. 

 Type locality. Paradise Creek, Mt. Ranier, Washington. 

 Geogr. Distr. Washington. Range not determined. 



♦The specific values of the forms of this genus as here given cannot be said to be satisfac- 

 torily determined. More specimens and a better knowledge of their distribution must be obtained. 



