608 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



PERISOEEUS CANADENSIS CAPITALIS, Bd. 

 EocKY Mountain Jay. 



Ouly seen in the Eocky Mountains at latitude 49°, where, however, it 

 was common and doubtless bred. The specimens secured in this locality 

 show the restricted dark areas of the head, upon which the variety capi- 

 talis is based. 



There is no doubt, however, that the true P. canadensis occurs in suit- 

 able localities in other parts of the region surveyed, since it has been 

 ascertained by Mr. T. M. Trippe to breed in the tamarack swamps of 

 Minnesota. 



List of specimens. 



TYEANNUS CAEOLINENSIS, (Gm.) Temm. 



KiNGBIED. 



Extremely numerous at Pembina, where many nests were taken after 

 the middle of June, and traced westward as far as the Survey progressed 

 that year. Ooe of the nests (No. 3062) was placed on a rail fence, in 

 the crotch formed by a post. In the Missouri region, it was equally 

 abundant from Fort Buford to near the headwaters of the Milk Eiver. 

 Many nests containing two to four eggs were taken the latter part of 

 June and early in July. One of these was particularly interesting, show- 

 ing that the Summer Warbler is not the only species that gets rid of 

 the obnoxious eggs of the Cowbird by building a second story to the 

 nest, and thus leaving the alien egg to addle in the basement below. A 

 nest taken near Frenchman's Eiver, containing two eggs, seemed to be 

 a curiously built affair, and oft examining it closely I found the wrong 

 egg embedded in its substance below the others (No. 4185). The King- 

 bird is not so much attached to woodland as has been supposed. I saw 

 great numbers whilst travelling by rail, on the prairies of Minnesota and 

 Dakota, where it seemed to be as much at home as anywhere. AJl 

 things considered, it may be rated as one of the most abundant and 

 generally diffused species of the whole region under consideration. 



