72 PROCEEDINGS OF THE ACADEMY OP 



a shy, wild and restless bird. The fact that it has a superb song, powerful 

 and finely modulated, may give a hinr as to its proper place in the series. It 

 seems to me to have little affinity with the forms with which it is usually 

 grouped. 



106. Myiade'stes Towjtsendii (And.) Cab. 



Rare summer resident. This species has-, like the Phanopepla nit ens, 

 eminent vocal powers, producing a rich, sweet, finely-modulated song. 



It is an interesting fact, taken in connection with its highly-developed lower 

 larynx, that the young Myiadestes is spotted all over exactly like a young 

 thrush. Numerous individuals which I studied several years ago differed from 

 the adult precisely as a youug Tardus migratorius does. Another marked 

 Turdine character is seen in the " booted '' tarsi very different from the 

 scutellations which obtain in Phcenqpepla, with which Myiadestes is usually 

 in'imatfly associated in classifications. Whether Phcenopepla is to be grouped 

 with the Atnpelidee or not, I think there is little doubt that Myiadestes is 

 typical of an aberrant subfamily Myiadestince, of Turdidee. 



HIRUNDINID.E. 



107. Progne i-tTBis (Linn.) Baird. 



Hirundo suhis, Linn. S. N., 1758. p. 192, (10th ed.) 

 Pror/iie subis, Baird, Rev. Amer. Bds., 1865, p. 274. 

 Hirundo purpurea, Linn., 12th ed. Progne purp. auct. Baird, B, N. A.. 

 1858, p. 314. 



Exceedingly abundant ; summer resident. Arrives first week in April : 

 remains till third week in September. Exclusively pinicoline ; eminently 

 gregarious ; breeds in Woodpecker's holes in company with Tachycinet<t 

 thalassina. 



108. Petrocheltdon lpxikrons (Say.) 



Abundant throughout tlie Territory, wherever suitable localities for its nest^ 

 are to be found. Associates freely with Panyp'ila melanoleuca, near the San 

 Francisco mountains. Especially abundant at several points along the 

 Colorado, where the river makes it way through precipitous canons. Arrives 

 at Whipple early in April ; remains until September. 



1 109.) HiRrNDo iiokreorfm Barton. 



" Numbers seen migrating through Fort Mojave, May 25, 1861." {Cooper.) 

 I found it one day in great numbers along the Rio Grande, near Albuquerque, 

 but never detected it at Fort Whipple. 



110. Tacuycixeta thalassina (Sw.) Cab. 



Very abundant, being the common and characteristic swallow of the pine- 

 regions of Arizona, as Petrocht-lidon lunifrons is of the canons, precipices, etc 

 Summer resident at Fort Whipple, arriving about March 20, and remaining 

 until late in September. See remarks, antea, upon Progne and Panyptila^ 

 Iris brown, bill black, mouth yellow, feet brownish black, 



111. Cotyle riparia (L.) Boie. 



Rare summer resident. A few observed at Fort Whipple late in April. 



112. STELGinoprEjJxx ?s^rrtpennis (And.) Baird, 



Summer resident, breeding abundantly. Arrives late in April, and remains 

 through the greater part of September, 



Some young birds, taken early in September, differ from eastern examples 

 in having the wing half an inch shorter ; the tail a fourth of an inch less. 

 The bills of both are quite identical, while the feet are even larger and 

 stouter. The upper parts are of a brighter, clear brown, instead of grayish 

 brown. The wing and tail coverts, and the outer margins of the secondaries 

 and inner primaries, are edged and tipped with dull ferru.gineous. The whole 



[March, 



