22 



number, were rather long and pointed, being .90 of an inch in length 

 by .60 in diameter. The ground color is a dull grayish white, thickly 

 and quite uniformly covered with small blotches of purplish brown, 

 giving to the eggs a decidedly dark purplish tint. In color the eggs 

 thus somewhat resemble those of Anthus ludovicianus. 



This species appears to migrate southward early in September, as 

 very few were seen between the Yellowstone and the Missouri on 

 our homeward march. Being necessarily migratory, and probably 

 passing quite far southward, it seems strange that a bird so numerous 

 should not have been before this met with during its migrations. 



SYLVICOLIDJS. 



14. Mniotilta varia Vieill. Black-and- White Creeper. 



A few were seen near Fort Bice, June 10th to 20th, and several 

 specimens were taken. 



15. Dendrosca SBstiva Baird. Yellow Warbler. 

 Abundant along the Missouri and Heart Bivers, and frequent on 



the Musselshell and Yellowstone. Very generally distributed, beino- 

 found also along all the streams wherever wooded. One of the most 

 numerously represented of the woodland species. 



16. Seiurus aurocapillus Swain. Golden-crowned Wagtail. 

 Abundant in the thickets and timbered bottom-lands in the vicinity 



of Forts Bice and A. Lincoln, and observed on Heart Biver, but not 

 elsewhere on the trip. 



17. Seiurus Pnoveboracensis Nutt. Water Wagtail. 



A water thrush, probably S. noveboracensis , was seen by Mr. Ben- 

 nett at the Big Bend of the Musselshell. 



18. Geothlypis trichas Cab. Maryland Yellowthroat. 

 More or less common along all the wooded streams, from the Mis- 

 souri to the Musselshell, and quite abundant at favorable localities. 



19. Geothlypis Philadelphia var. Macgillivrayi All. 

 Mourning Warbler. 



Seen a few times along the Musselshell. 



20. Icteria virens Baird. Yellow-breasted Chat. 

 Common in the woodlands along the Missouri, and observed at rare 



intervals on the Yellowstone and Musselshell; also seen on Heart 

 Biver and the Little Missouri. 



