1916 1 Grinnell: Analysis of Trinity Fauna 405 



Piranga ludoviciana. 



Bomoycilla garrula (in winter, only). 



Vireosylva gilva swainsoni. 



Lanivireo solitaries cassini. 



Vireo huttoni huttoni. 



Vermivora celata lutescens. 



Dendroica aestiva orewsteri. 



Dendroica townsendi (probably a transient, only). 



Geothlypis trichas occidentalis. 



Icteria virens longicauda. 



Wilsonia pusilla chryseola. 



Cinclus mexicanus unicolor. 



Troglodytes aedon parkmani. 



Sitta carolinensis aculeata. 



Sitta canadensis. 



Regulus satrapa olivaceits. 



Reguhts calendula. 



Hylociehla ustulata ustulata. 



Hylociehla ustulata swainsoni (possibly an exceptional occurrence). 



Hylociehla guttata nanus (in winter, only). 



Planesticus migratorius propinquus. 



Ixoreus naevius naevius (in winter, only). 



Sialia mexicana occidentalis. 



Kellogg (1916) lists 47 mammals and 95 birds from the Trinity 

 region, a total of 142 vertebrate species. In spite of the very high 

 grade of field-work carried on by Misses Alexander and Kellogg dur- 

 ing the time of their exploration in the region, it is not for a 

 moment to be inferred that this is the total number of mammal and 

 bird species regularly occurring in the region. But it is the knovm 

 fauna. A few included species may prove to be stragglers and not 

 really to be considered in faunal analysis. Obviously the present 

 assignment of species must be accepted only as provisional ; at the 

 same time it is probable that the general situation as regards pro- 

 portional constituency of the various categories of species would 

 remain very nearly the same as here indicated, even after such 

 intensive and long-continued survey as might be devoted to the 

 Trinity region in the future. Increments from future field-work 

 would be likely to be distributed pretty evenly among the several 

 categories so that the ratios would continue but little if any changed. 



As indicated in the foregoing tables, 65 species out of the total 

 142 are either widespread through all the faunas here concerned 

 or are of unknown status, in either case being removed from con- 

 sideration in any attempt to establish differences between the faunas. 

 This disposes at once of 46 percent of the Trinity fauna. 



