280 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
41857.—Baird, Mam. N. Amer., 572-617. JL. glacialis, = L. timidus var. arcticus ; L. americanus ; L. 
Washingtoni, = L. americanus var. Washingtoni; L. campestris; L. callotis ; L. californicus ; 
L. sylvaticus, = L. sylvaticus var. sylvaticus ; L.artemisia and L. Bachmani, = L. sylvaticus var. 
Nuttalli; L. Auduboni (here first described), = L. sylvaticus var. Auduboni; L. Trowbridgei ; 
L. aquaticus ; L. palustris. Thirteen species are here recognized, which in this monograph 
are regarded as representing eight valid species and four valid varieties, one name only 
(L. Bachmani) being here reduced to a synonym. JL. flavigularis Wagner and L. texianus 
Waterhouse are doubtfully referred to ZL. callotis ; L. terianus Audubon and Bachman is 
regarded as a species probably distinct from the L. texianus Waterhouse, but is mentioned 
as a species which his materials did not allow him “ to discuss or describe”. L. Nuttalli is 
doubtfully referred to L. artemisia. He states that he strongly suspects the specimen on 
which ZL. Nuttalli was based to be an immature example of L. artemisia, and points out the 
fact that, in case it proves to be so, the name Nuttalli must take precedence over artemisia. 
The L. cunicularius of Lichtenstein (Waterhouse), based on Mexican specimens, he properly 
suggests ay prove to be L. aquaticus, as is undoubtedly the case. No mention is made of 
the L. longicaudatus of former authors, which Waterhouse had previously shown was African, 
and not referable to any American species. The synonymy of the subject is judiciously and 
exhaustively treated, and in no case do any of the collocations seem to require changing. 
Furthermore, in this monographic essay, the species are for the first time subgenerically 
divided ; no names are, however, affixed to his very natural subdivisions, which are very prop- 
erly treated as merely sections rather than as groups of a technically subgeneric value. Baird’s 
treatment of the subject forms as great an advance over our previous knowledge of the 
group as did Bachman’s articles twenty years before, and warks a second grand epoch in the 
literature of the North American Leporidew. Finally, Baird’s work thus far greatly surpasses 
in accuracy and thoroughness any treatment of the Leporide of any part of the world. 
41857.—Newberry and Baird, Zo6]. of Lieut. Williamson’s Rep. upon Expl. for a R. R. Route from the 
Sacramento Valley to the Columbia River (Pacific R. R. Expl. and Surveys, ete., vi, pt. iv, 
no. 2, pp. 62-65). Field-notes by Dr. Newberry; identifications by Professor Baird ; 
synonymy and diagnoses from Baird’s Gen. Rep. Mam. N. Amer. The species mentioned are 
x L. campestris, L. californicus, L. “ artemisia”, L. “ Auduboni”, and L. Trowbridgei. 
1859.—Baird, Zoél. U. S. and Mex. Bound. Survey, 45-48. ZL. callotis (described in detail), and L. 
californicus, L. sylvaticus, L. artemisia, and L. Bachmani (the two latter = L. sylvaticus var. 
Nuittalli) mentioned by name merely, with field-notes by the collectors. 
§859.—Kennerly, Zodl. of Lieut. Whipple’s Route, near the 35th Parallel (Pacific R. R. Expl. and 
Surveys, ete., x, pt. vi, no. 2, 16,17). Field-notes by Dr. Kennerly, with diagnoses extracted 
from Professor Baird’s Gen. Rep. Mam. N. Amer. The following species are mentioned :— 
L. callotis, L. “ artemisia”, L. “ Auduboni”, and L. Trowbridgei. 
2860.—Cooper, Zoél. of Gov. Stevens’s Route near the 47th and 49th Parallels (Pacific R. R. Reps. 
xii, pt. ili, no. 2,87). Field-notes and measurements by Dr. Cooper, with diagnoses of the 
species from Baird’s Gen. Rep.Mam.N. Amer. The species mentioned are L. “ Washingtoni”, 
and L. Trowbridgei. 
1860.—Suckley, Ibid., pp. 103-105. Field-notes by Dr. Suckley and diagnoses from Baird’s Gen. Rep. 
Mam. N. Amer. The species enumerated are L. “ Washingtoni”, L.campestris, L. californicus, 
“?L. callotis” (= L. callotis), and L. “ artemisia”. 
1860.—Suckley and Gibbs, Ibid., pp. 130-133. Chiefly field-notes on ZL. “ Washingtoni”, L. campestris, 
“? TL. callotis” (= L. callotis), L. californicus, and L. artemisia. 
E861.—Maximilian, Wiegm. Arch., 1861, i, 142-145. Habits and distribution of ZL. americanus, L. syl- 
vaticus, and L. campestris. 
1861.—Ross, Canad. Nat. and Geol., vi, 436. Notice of L. americanus. 
1862.—Hayden, Trans. Amer. Philos. Soc. Phila., xii, 148. Notes on ZL. campestris, L. sylvaticus, and 
L. “ artemisia”. 
1867.—Coues, Amer. Nat., i, 531-535; Proce. Acad. Nat. Sci. Phila., 36. Habits and distribution of Z. 
callotis and L. “artemisia” in Arizona. 
1867.—Gray, Ann. and Mag. Nat. Hist., 3d ser., xx, 221-225. Divides the genus Lepus into seven so- 
called genera, raising several of Baird’s seetions (see Mam. N. Amer., 574, 575) to generic 
rank, His seven genera are (1) Hydrolagus (—Baird’s section F), (2) Sylvilagus (= Baird’s 
section D), (3) Hulagos, (4) Lepus (= Baird’s sections A and E), (5) Tapeti, (6) Cuniculus 
(= Baird’s section C), and (7) Caprolagus. The American species recognized are as follows :— 
(1) Hydrolagus aquaticus (= L. aquaticus), to which he properly refers his L. Douglassi var. 1; 
