19 
103. SECTIONS OF AMCEBA PROTEUS. 
Nos. 101-103 inclusive, exhibited by Mr. Gary N. Calkins. 
103a. MONOGRAPH OF THE ANT THRUSHES OR FAMILY 
Pirtipa:. Pastsiieand IT, 1893—04., By D:. G. Elliot: 
103 6. 1. THE GEOGRAPHICAL DISTRIBUTION OF NORTH 
AMERICAN MAMMALS. 
2. THE GEOGRAPHICAL ORIGIN AND DISTRIBUTION OF 
NORTH AMERICAN BIRDS, considered in relation to the 
Faunal Areas of North America. 
3. Series of FOUR COLORED MAps of Faunal Areas in North 
America, illustrating the preceding papers. 
By |e aneallen eh. D, 
103c. NEW NORTH AMERICAN MAMMALS from the American 
Museum of Natural History. 
During the last ten years, and especially within the last five 
years, great progress has been made in the study of North 
American mammals, especially through the introduction of 
new methods and new devices in trapping such small, noc- 
turnal, or burrowing species as the Pocket Gophers, Moles, 
Shrews, Kangaroo Rats, Pocket Mice, and the various field 
Rats and Mice. Also field work and trapping has been 
carried on on an immense scale, resulting in the addition to 
the available material for study of tens of thousands of speci- 
mens. As a result, among the groups above named, not 
only have more species and sub-species been discovered and 
described within the last five years than were previously known, 
but also quite a number of new genera and sub-genera. 
While it is impracticable to very fully illustrate work of this 
character, a few of the more striking or interesting forms have 
been selected for exhibition. 
1. Lepus Allent Mearns. The largest and finest of all of the 
North American Big-eared, or “Jackass” Hares. 
2. Lepus cinerascens Allen. A desert Hare of Southern 
California, quite different from any previously known. 
3. Zapus princeps Allen. A new Jumping Mouse from Colo- 
rado. 
