NEW YORK ZOOLOGICAL PARK. 131 
BRAZILIAN TREE PORCUPINE. 
Nature in which the production of all animal life is ecare- 
fully balanced; for a part of the exhibition is composed of 
representative species of mammals that, in turn, prey upon 
the serpents, thus keeping even the destroyers of the smaller 
injurious creatures within bounds! 
During the past two years the collection of rodents has 
been steadily growing in importance. The following is a 
list of the species on exhibition at the close of the year 1910: 
RODENTS IN THE ZOOLOGICAL PARK. 
HARES AND RABBITS (Leporidae) 
Mexican Swamp Rabbit................... Lepus palustris. 
Cotton=Vaily Rabbits... 2. ccccccacdecee eta s Lepus palustris mallurus. 
Domestic Rabbits, various breeds.......... (Nursery stock.) 
SQUIRRELS AND MARMOTS (Sciuridae) 
Thirteen-Lined Spermophile...............! Spermophilus 13-lineatus. 
Desert Spermophile: ..2)..56 6.4 s0. cs seed Hele Spermophilus leucurus. 
Richardson Spermophile................... Spermophilus richardsoni. 
SWidOG CHUClss ais aiecna 85-3 DS Aeceeaees Reea gui iace we Adrctomys monav. 
| EAB Coton D Yo} sats peice ernst ee eae eee eS Cynomys ludovicianus. 
Huropean Squirrel yids aiceleteh ee oe newline Sciurus vulgaris. 
Mexican! Squirrel wee. eacsexs nance ss Sciurus aureogaster. 
Central American Squirrel................. Sciurus variabilis, 
Cubanesgquirrelliecai st cticdct be tiaAS. Sivas Sciurus chrysurus. 
Variable: Squirrel sass oc ss ncceessa tan sewes Sciurus griseo-flavus. 
Grays SQUITTOL hacen ene sk nian e eee ee ave ne Sciurus carolinensis. 
“Black Squirrel so 3cccctisavi vise yweken ence. Sciurus carolinensis niger, 
