58 EXPLORATIONS AND SURVEYS WEST OF 100TH MERIDIAN, 



10. Dendroica cestiva, (Gin.) Yellow Warbler. 



Common everywhere. Not seen till May 14, when it made its appear- 

 ance in large numbers. 



11. Dendroica audiibonii, (Towns.) Audubon's Warbler. 



Small numbers of this and the following species were seen May 7 ; 

 common on the 10th. Its habits and notes appear to correspond almost 

 exactly with those of the common Yellow Bump. 



12. Dendroica coronata, (L.) Yellow-rump Warbler. 



In much fewer numbers than the preceding, with which it was asso- 

 ciated. Have heard males of the two species singing in the same tree. 

 All apparently migrate farther north. 



13. Dendroica maculosa, (Gin.) Black and Yellow Warbler. 



A single fine male taken May 17. ~No others were seen. This is the 

 first note of its occurrence west of the plains. 



14. Dendroica caerulea, (Wils.) Ooeruleau Warbler. 



A small warbler seen May 17 was unquestionably of this species. 

 Its small size and bright-blue color made it conspicuous among a flock 



