384 PROCEEDINGS OF THE ACADEMY OF [1899. 



(lian), 25.4; posterior edge of bony palate to hamular, 14; length 

 of incisive foramen, 16; width of incisive foramina, 7; zygomatic 

 breadth, 32; interorbital breadth (exclusive of supraorbital pro- 

 cesses), 11.6; greatest breadth of brain case, 25.6 ; breadth of 

 rostrum at base of zygomata, 18.8; greatest (diagonal) length of 

 nasals, 18.4; greatest breadth across both nasals, 12.6; least 

 breadth across both nasals, 8. 6 ; depth of brain case at anterior end 

 of basioccii^ital, 21.4; diastema, 18; maxillary molar series 

 (alveoli), 13; mandible, 48.6; diastema, 14; mandibular molar 

 series (alveoli), 13. 



Specimens Examined. — Two, both from the type locality. 



General Remarks. — Lepus bachmani ubericolor .is a typical 

 ' northwest-coast form,' differing from the Califoi'nian phase of 

 the species in richer, more abundant pigmentation. 



Subgenus SYLVILAGUS Gray. 



In the absence of positive knowledge of the relationships of the 

 cottontails, I have treated the four forms here described as sub- 

 species of Lepus floridanus. 

 Lepus floridanus yucatanicus subsp. nov. 



1877. Lepus aquaticus Allen, Monogr. N. A. Kodentia, p. 365, 



(part). Not of Bachiuan, 1837. 

 1890. Lepus sylvatieus aztecics Allen, Bnll. Am. Mus. Nat. Hist., iii, 

 p. 191, December 10, 1890. Not of Allen, ibid., p. 188. 



Type adult 9 (skin and skull). No. |j;fH United States National 

 Museum, collected at Merida, Yucatan, February 22, 1865, by 

 A. Schott. Original number, 207. 



General Characters. — Closely related to Lepus floridanus aztecus 

 (Allen), from Tehuantepec, but larger and darker. Skull with 

 disproportionately large audital bullae. 



Color. — Back a uniform coarse grizzle of black and light buff, 

 the latter slightly predominating. On the sides and rump the buff 

 becomes paler and the black less conspicuous, producing a very 

 slightly paler grizzle. Under fur on back bluish gray, becoming 

 distinctly brownish at tip. On the rump the basal color of the 

 under fur is paler and the terminal half of the hairs (10 mm.) 

 becomes bright cinnamon rufous, imparting to the fur of the region 

 a distinct reddish cast. Tail (imperfect in the type, but complete in 

 other specimens) white beneath, dull, grizzled, reddish brown 

 above. Nape patch clear bright cinnamon rufous. Ears gray, on 



