APPENDIX N N. 
1307 
12. Dendroica audubonii. 
13. Dendroica oUvacea. 
14. Dendroica gracia}. 
15. Geothlgpis niacgillivrayi. 
16. Setopliagapicta. 
17. Cardellina rnbrifrons. 
Helminthophaga Indcv, Virginia, and Dendroica grades., are tlie only ones belonging ex* 
clusively to this region. 
Of Dendroica occidentalis, loivnsendii, and nigrescens, the two first come more properly 
within the Pacific province, as they breed about the Columbia River and Northern Sier¬ 
ras, and only find their way to the Rocky Mountait s during the fall migrations, and then 
to the southern portions of the chain. Dendroica nigrescens is equally an inhabitant 
of both regions. Dendroica olivaceci, Setopliaga picta, and Cardellina rnbrifrons only occur in 
our territory in Southern Arizona. This portion of that Territory, as well as the cor¬ 
responding part of New Mexico, faunally considered, belongs with and is indivisible 
from Northern Mexico. 
Leaving the middle region and approaching the Pacific coast, we find that the num¬ 
ber of warblers still diminishes, whether we consider the mountains proper, or the low 
coast regions. In this province we find no species which wo have not recognized in 
one or the other of the two provinces mentioned, though D. occidentalis and D. townsendii 
are characteristic of this province as summer residents. 
The following is the list: 
1. Helminthophaga ruficapilla. 
2. Helminthophaga celata var. lutescens. 
3. Dendroica cesliva. 
4. Dendroica occidentalis. 
5. Dendroica townsendii. 
6. Dendroica nigrescens. 
7. Dendroica coronata f 
8. Dendroica audubonii. 
9. Geothlgpis trichas. 
10. Geothlgpis macgillivrayi. 
11. Icteria virens. 
12. Myiodioctes pusillus var. pileolatus. 
Two instances are to be noted here where birds continuing unchanged as they pass 
from the eastern into the middle province, are in the Pacific region differentiated into 
varieties, namely, Helminthophaga var. lutescens ar d Myiodioctes var. pileolata. 
The evident preponderance of J:he number of species of this group in the Eastern 
United States, taken in connection with the fact that, so large a proportion of the forms 
that occur in the western half of the country are eastern species, but little changed, or, 
as in most iostaoces, actually the same, aud that so few are peculiar to that region, 
seems strongly to favor the assumption that it was in the East that the family had its 
origin, and that few, perhaps none, of the group were indigenous to the West. 
A further consideration of the number of warblers inhabiting the more northern and 
eastern parts of North America, in comparison with those of the southern parts or 
Mexico and South America, seems to point to the conclusion that the original center of 
the family was actually in this (the former) region, and that it radiated out from a 
comparatively circumscribed area, to become firmly established in and indigenous to 
the sections where it now nourishes. The Canadian and Hudsocian faunas, as re¬ 
stricted by Allen, receive a larger proportion of warblers in the breeding season than 
are to be found in any other region of North America of similar extent. 
In his g ographical distribution of mammals, Wallace arrives at a similar conclusion 
respecting the Motacillidee, (warblers,) giving their probable origin as North-Temperate 
America. 
LIST OF BIRDS OBSERVED NEAR CARSON CITY, NEV., FROM AUGUST 25 TO SEPTEMBER 16, 
AND FROM NOVEMBER 10 TO NOVEMRER 20, 1876, WITH NOTES. 
TURDIDiE. 
1. Turdus migratorius, L., var. propinquus, R.—Nevada Robin. 
Under the above name Mr. Ridgway has recently described a western variety of the 
robin, and has indicated certain differences that obtain in the species as it occurs from 
the eastern base of the Rocky Mountains westward, as compared With examples of the 
bird from the region east of the Missouri Plains. 
The specimens we have seen from Nevada correspond well with his diagnosis of the 
above bird, aud, while we cannot consider the forms in question as illustrating “ two 
