176 



there is also a slight impress of the desert fauna of the Middle Prov- 

 ince in consequence of the arid nature of the Green River dist'rict, 

 while along the eastern base of the mountains the peculiar fauna of 

 the Plains is the prevailing one upon the grassy foot-hills and prairies. 

 The following tables will show more clearly the distinct geograph- 

 ical elements in the Colorado avi-fauna. The species with an aste- 

 risk (*) prefixed were first found in Colorado by Mr. Aiken. 



I. EASTERN SPECIES FOUND IN COLORADO. 



1. Turdus fuscescens. 



2. Turdus Swainsoni. 



3. Galeoscoptes Carolinensis. 



4. Harporhynchus rufus. 



*5. Sialia sialis. 



*6. Helminthophaga peregrina. 



*7. Parula Americana. 



8. Dendroica coronata. 



9. Setophaga ruticilla. 



*10. Passerculus savanna. 



11. Zonotrichia leucophrys. 



12. Junco hyemalis. 



13. Spizella monticola. 



14. Euspiza Americana. 

 *15. Cyanospiza cyanea. 



16. Dolichonyx oryzivorus. 



*17. Icterus Baltimore. 



18. Icterus spurius. 



19. Quiscalus seneus. 



Supposed Western Limit. 



Salt Lake Valley ; breeding ; 

 common. EIDGWAY. 



E. Humboldt Mts., Nevada; 

 Sept. RiDGWAy. 



Islands of Salt Lake ; breed- 

 ing. RIDGWAY. 



Eastern base of Rocky Moun- 

 tains. GOV'T SURVEY. 



El Paso Co., Col. AIKEN. 

 El Paso Co., Col. AIKEN. 



El Paso Co., Col., May 11. 

 AIKEN. 



Denver, Col. WERNIGK. El 

 Paso Co. AIKEN. 



Islands of Salt Lake ; breed- 

 ing. RIDGWAY. 



El Paso Co., Col. AIKEN. 



Wahsatch Mts. ; W. slope ; 

 breeding. RIDGWAY. 



Arizona. COUES. Utah. HEN- 

 SHAW. Colorado. AIKEN. 



Col. R. KENNERLY. W. Na. ; 

 com. win. res. RIDGWAY. 



Denver. ALLEN. 



El Paso Co., Col. AIKEN. 



Ruby Valley, Nevada, Aug. 

 and Sept. RIDGWAY. 



El Paso Co., Col. AIKEN. 

 Denver, Colorado. ALLEN. 



Fort Bridger, Wyoming. 

 DREXLER. Col. AIKEN. 



