Vol 'i9i9 XVI ] Taverner, Birds of Red Deer River, Alta. 261 



11, August 23 and September 8 and 18. The first one is in striped juvenile 

 plumage and was probably raised nearby. 



160.* Dendroica magnolia. Magnolia Warbler. — Two seen and 

 taken, September 1, at Camp 11, Little Sandhill Creek. 



161.* Dendroica striata. Black-polled Warbler. — Only seen 

 at Camp 11, Little Sandhill Creek, August 28 and September 1. Two 

 specimens, the latter date. 



162.* Dendroica virens. Black-throated Green Warbler. — 

 But one seen and collected at Camp 11, Little Sandhill Creek, August 17. 



163. Dendroica palmarum. Palm Warbler — Two birds seen by 

 Young at Camp 11, Little Sandhill Creek, September 1. 



164.* Seiurus aurocapillus. Ovenbird. — Heard nearly every day 

 about Camp 1 , but none noted again until Young secured two at Camp 1 1 , 

 Little Sandhill Creek. August 27 and September 1. 



165.* Seiurus noveboracensis. Northern Water-Thrush. — One 

 or two seen nearly every day the last week in August at Camp 11, Little 

 Sandhill Creek, specimens, August 20 and 21. These are referable to 

 S. n. notabilis. 



166.* Oporoenis Philadelphia. Mourning Warbler. — At Camp 1, 

 where warblers were scarce, this was the species most often met with. A 

 mated pair were taken just below Camp 4 near Nevis. In all these birds 

 the abdomen was bare and thickened so they were undoubtedly breeding. 

 Young took another at Camp 11, Little Sandhill Creek, August 17. The 

 male of the Camp 4 pair, is typical Philadelphia but the female has the 

 eyelid spots as pronounced as in many female Macgillivray's Warblers. 

 It is evident that females of the two species may be difficult of separation. 

 This specimen unaccompanied by its mate would almost unhesitatingly 

 be referred to 0. tolmiei. The Camp 11 specimen is also interesting. By 

 skull structure it is a juvenile but is very different in coloration from any 

 other specimen in our collection. It is Empire Yellow below warming 

 to Primuline Yellow, 1 instead of Lemon Chrome changing to Sulphur 

 Yellow on neck and throat as is shown by comparable August and Sep- 

 tember material from Point Pelee, Ontario. However, fall specimens of 

 this species are scarce in collections and I have no fall juveniles of tolmiei 

 for comparison and include it under Philadelphia on the strength of ac- 

 companying specimens. 



167.* Geothlypis trichas. Maryland Yellow-throat. — Sparingly 

 distributed but seen practically throughout, the trip and becoming a little 

 more common as we descended. The last week in August they were fairly 

 common at Camp 11 on the Little Sandhill Creek but thinned out after 

 the first of September. Specimens from Camps 4|, 8 and 11. In harmony 

 with the findings of the A. O. U.C ommittee as indicated in the ' Check-list,' 

 I am inclined to refer our Canadian prairie Yellow-throats to occidentalis 

 rather than to trichas, of brachidactyla, as some of them have been desig- 

 nated by Oberholser. In fact I find them easily distinguishable from 



1 Ridgway's Color Standards and Nomenclature. 1912. 



