554 



BULLETIN UNITED STATES GEOLOGICAL SUEVEY. 



It is a very carious fact, in the history of this genus, that a variety of 

 Beguhis calendula, or a very closely allied species, should be among the 

 few resident birds which constitute the isolated fauna of the island of 

 Guadeloupe, 200 miles south of San Diego, Cal. 



PAEUS ATEIOAPILLUS SEPTENTRIONALIS, Sarris. 

 Long- TAILED Chickadee. 



An abundant resident of the region of the Upper Missouri, in all 

 suitable situations ; but neither this nor any other species of the genus 

 was noticed in the Eed Eiver Yalley. It is the characteristic form of 

 the whole Eocky Mountain region from the Fur Countries into Mexico, 

 where it is the only representative of the genus, excepting P. montanus. 



Detailed measurements of a series of specimens of this disputed form, 

 for comparison with those of P. atricapillus, will be found in my work 

 already quoted. These were carefully made in the flesh, at Fort Ean- 

 dall, during the winter of 1872-73. The average length was found to 

 be 5.50 inches; the wing, 2.40 to 2.75; and the tail, 2.60 to 2.80. 



A specimen procured at Chief Mountain Lake is preserved among 

 the collections of the Commission. 



List of specimens. 



TEOGLODYTES AEDON, Vieill. 

 House Wren. 



Observed as far west as the confines of the Missouri Coteau. The 

 westernmost specimens, as well as those from the immediate valley of 

 the Eed Eiver, ai)pear to be typical aedon. The Eastern form has also 

 occasionally been met with in the Missouri region itself; though there, 

 the prevailing type is the var. parhmanni. 



On the Eed Eiver, in June, the species was breeding very abundantly 

 in the neighborhood of the fort and town of Pembina. 



List of specimens. 



