PREFACE. 



The object of the present Bulletin is twofold: To call attention to 

 the richness of the United States National Museum in North Ameri- 

 can recent mammals, and to furnish a summary of the systematic 

 results of study in this field to the end of the year 1923. North 

 America as here understood includes the entire continent from 

 Panama northward; also Greenland, the Greater Antilles, and the Lesser 

 Antilles south to Grenada. In no other museum is the mammal 

 fauna of so large an area so fully represented. The completeness of 

 this representation is shown by the following tabular synopsis : 



Family. 



Didelphiidse 



Nesophontidpp.. . 

 Solenodontida^ . . . 



TalpldfT 



Soricid;r> 



Emballonurida?.. 



Noctilionidffi 



Phyllostomidse... 

 Desmodontidfe. . . 



Natalidae 



Thyroptcridae 



Vespertilionidap . . 



Molossida? 



Ursidse 



Procyonidae 



Bassariscidm 



MustelidiE , 



Viverridae , 



Canidse 



Felidae 



Otariida? 



Phocidfc 



Odobenid.T 



Callitrinhida^ 



Alouattida; 



Aotidae 



Cebidse 



Saimirida" 



Lasiopygida' 



HominidsR 



Sciuridae 



GeomyidfE 



Heteromyidae 



Num 

 ber 

 of 

 forms 

 recog- 

 nized. 



Num- Num- 



38 



3 



2 



30 



117 



11 



4 



113 



2 



9 



3 



88 



32 



103 



31 



11 



150 



1 



68 



43 



4 



14 



2 



1 



5 



3 



9 



2 



2 



3 



322 



143 



195 



ber 



of 

 forms 



in 

 col- 

 lec- 

 tion. 



28 

 1 

 2 



28 



111 



9 



4 



1 



79 



31 



98 



30 



10 



139 



1 



60 



38 



4 



14 



2 



1 



4 



3 



7 



1 



2 



3 



312 



139 



185 



ber 



of 



forms 



not 

 repre- 

 sent- 

 ed. 



Eu- 

 types 



15 



176 

 95 

 132 



Hy- 

 po- 

 types, 



Family. 



[ Castoridae 



Cricetidae 



(Cricetina>) 



I (Microtinae) 



i Muridae 



j Aplodontiid.'e 



t Zapodidap 



Erethizontidic. . 



Echimyidae 



Dasyproctidap 



Cuniciilida:' 



Hydrochoerida?... 



Ochotonidae 



Leporidac 



Tayassuidae 



Cervidae 



Antilocapridae... . 



Bovidag , 



Tapiridae 



Bradypoididae. . . . 



Cholocpodidae 



M yrmccophagidae . 



Dasypodidae 



Trichechidac 



Balaenidae 



Rhachianectidnc. . . 



Balaenopteridae . . . 



Physeteridae 



Kogiidae 



Delphinidae 



Ziphiidae 



ber 



of 



forms 



Num- 

 ber 

 of 



forms 



recog-l col- 



nized.l lec- 

 tion. 



Num-'Num- 



13 I 11 



604 I 588 



(428) (401) 



(176) 1(167) 



5 j 5 



9 ' 8 

 24 

 12 

 23 

 14 



2 



1 

 24 

 102 

 10 

 60 



3 

 23 



2 



3 



1 



5 



5 



2 



3 



1 



5 



1 



1 

 24 



ber 

 of 

 forms 

 not 

 repre- 

 sent- 

 ed. 



2 



36 



(27) 



(9) 



55 



3 

 18 



2 



3 



1 



5 i, 

 t 



4i 



2 j, 



2 I 



1 . 



5 I. 



1 1. 



1 I. 



22 I 



7 



Eu- 

 types 



5 



355 



(252) 



(103) 



Hy- 

 po- 

 types. 



42 

 (36) 

 (6) 



1 



Total 2,554 2,383 i 171 1,344 



91 



While preparing this Bulletin I have received much assistance 



from members of the Biological Survey and from Mr. N. Hollister, 



superintendent of the National Zoological Park; also from Mr. A. B. 



Howell, of Pasadena, California. „ r, -. ^ 



Gerrit S. Miller, Jr. 



