INTRODUCTION. xi 
Taste IV.—Nearetic Species extending to Guatemala and Honduras, but not recorded 
from south of Nicaraqua. 
1. Mephitis mephitica. 5. Sciurus variegatus. 
2. putorius. 6. Ochetodon mexicanus. 
3. Sciuropterus volucella. 7. Lepus palustris. 
4, Sciurus carolinensis. 8. Didelphys virginiana. 
Taste V.—Nearctic Species extending to Costa Rica and Panama, but not recorded from 
south of the Isthmus of Panama. 
1. Canis latrans. 4, Nasua nasica. 
2. Vulpes virginiana. 5. Sigmodon hispidus. 
3. Procyon lotor. 
II. NEOTROPICAL SPECIES. 
We will now take a glance at the species belonging to the Central-American 
Mammal-fauna which may be considered as intruders into it from the opposite direction, 
7. é. from the south. These are 65 in number as against 48 intruders from the north, 
and by their number at once tend to show the true composition of the Central-American 
Mammal-fauna. It is perhaps not necessary to give a separate detailed list of them, as 
they are already indicated in Table I. But it will be seen at a glance that they com- 
prehend members of such genera as Ateles, Cebus, Nyctipithecus, Midas, Chilonycteris, 
Vampyrus, Desmodus, Diphylla, Cercoleptes, Coclogenys, Myrmecophaga, Cycloturus, and 
Chironectes, than which there can be no more typical representatives of the Neotropical 
Mammal-fauna. 
III. NEoGEan SPECIES. 
The Central-American Mammals which extend outside the Central-American area in 
both directions are 17 in number, as set out in the subjoined Table. No very precise 
conclusions can be drawn, I think, from this category. 
Taste VI.—Species common to the Nearctic and Neotropical Regions. 
1. Vesperugo serotinus. 10. Mustela brasiliensis. 
2. Atalapha noveboracensis, 11. Conepatus mapurito. 
3. cinerea. 12. Lutra felina. 
4, Vespertilio lucifugus. 13. Monachus tropicalis. 
5. Nyctinomus brasiliensis. 14. Manatus australis. 
6. Macrotus waterhousii. 15. Dicotyles tajacu. 
7. Felis onca. 16. Cariacus virginianus (?). 
8. pardalis. 17. Tatusia novemcincta. 
9. concolor. 
