414 LEPUS, 
KEY TO THE SUBGENERA: 
A. Tail rudimentary. 
a. Interparietal persistent as a distinct bone in 
adults. 
a.’ Ear shorter than hind foot. 
a.’ Skull and teeth strong, heavy; postor- 
bital process of frontal ankylosed PAGE 
with cranium for its entire length...... Limnolagus 414 
b.” Skull and teeth ighter; postorbital pro- 
cess of frontal ankylosed with cra- 
nium behind, inclosing a foreman........ Silvilagus 416 
bt’ Bar longer than hind foot. ..),--.7- eee Microlagus 428 
b. Interparietal always obliterated in adults....Macrotolagus 431 
Be Pail mone .3.9 sss 0 se cane 2 eee ie Tapeti 426 
A. Limnolagus. 
“Interparietal present as a distinct bone in adults. Skull and 
teeth massive; rostral portion of skull wide as high; postorbital pro- 
cess of frontals ankylosed with the cranium for its entire length; 
frontals and parietals deeply pitted; skull rather straight above, about 
half as wide as long; pelage harsh; head small; ear, tail, and hind 
foot short, the latter scantily haired.”’ 
KEY TO THE SPECIES AND SUBSEECGIES: 
A. Skull large, heavy; frontals and parietals deeply 
pitted; pelage harsh. 
a. Basisphenoid and basioccipital forming an 
obtuse angle. PAGE 
a.’ Above pale buffy gray, lined with black. .L. a. attwatert 414 
b.’ Above yellowish brown, tinged with 
rufous and lined with black, 2275735955 L. palustris 415 
b. Basisphenoid and basioccipital on same plane..... L. yaa Age 
aquaticus attwateri (Lepus), Allen, Bull. Am. Mus. Nat. Hist., 1895, 
p. 327. Elliot, Syn. N. Am. Mamm., 1901, p. 278. 
ATTWATER’S SWAMP HARE. 
Type locality. Medina River, 18 miles south of San Antonio, 
Bexar County, Texas. 
Geogr. Distr. Yucatan, Mexico, to southeastern Texas. 
Genl. Char. The general color paler than that of L. aquaticus. 
Size similar. 
Color. Above pale buffy gray lined with black; sides whitish gray 
tinged with buff; dorsal region tinged with yellowish, darkest on the 
rump; belly and inside of legs white; back sometimes nearly all black; 
