578 BULLETIN 203, UNITED STATES NATIONAL MUSEUM 



more yellowish above, the yellow of the underparts is brighter and 

 more extensive (the flanks of the males are only slightly, or not at all, 

 tinged with grayish), and the post- frontal white band in the males 

 is even wider and is noticeably suffused with yellow." Its range, he 

 says, is "north-central Sonora, northeast to the San Pedro River in 

 Cochise County, Arizona ; east to northwestern Chihuahua and south, 

 in spring at least, to Tecoripa, east-central Sonora." 



Three of the four localities from which the Sonora yellowthroat is 

 known indicate an upland habitat, and its range, when finally worked 

 out, will probably be found to center in the northern part of the 

 Mexican plateau. 



Van Rossem (1945) , speaking of Mexico, writes : "Evidently a fairly 

 common resident in suitable localities along fresh water streams from 

 the vicinity of Rancho La Arizona (and very probably from the Altar 

 River valley) eastward across the northern part of the State nearly 

 or quite to the Chihuahua boundary. The southernmost breeding 

 station known at the present time is Pilares in the Bavispe River 

 valley. * * * One specimen taken at Tecoripa, March 3, 1929, 

 indicates a seasonal movement by part, at least, of the population." 



Monson and Phillips (1941) state that chryseola is common at 

 Feldon, Ariz., and that birds taken at Tucson and Bisbee are of this 

 race. Burleigh and Lowery (1940) collected a male 10 miles east 

 of Guadalupe Peak, Tex., at an elevation of 4,500 feet in an arroyo in 

 the open desert on April 29, 1939. Sutton and Burleigh (1939) col- 

 lected a male several miles north of Victoria, northeastern Mexico on 

 February 25, 1938. 



GEOTHLYPIS TRICHAS SCIRPICOLA Grinnell 



TULE YELLOWTHROAT 



Contributed by Alfbed Otto Gboss 



HABITS 



The tule yellowthroat was described by Grinnell (1901) as "simi- 

 lar to GeotMypis trichas occidentalism but brighter colored and larger 

 throughout with especially longer tail. Twenty-five males from the 

 Pacific slope of Los Angeles County measure : Wing, 55 mm. to 60.3 

 mm. averaging 57 mm.; tail, 56 mm. to 64 mm. averaging 60 mm. 

 Scirpicola is the brightest and deepest colored of all [the western 

 yellowthroats] , the yellow of the under parts being more extended 

 posteriorly and having a hint of an orange tint, while the upper parts 

 are brighter brown or green according to age and wear." A. J. Van 

 Rossem (1930), in comparing the tule with the western yellowthroat, 

 states that it has a brighter coloration and a slightly larger bill. "In 



