258 University of California Publications in Zoology L VoL - 10 



tion of E. griseus, not only between griseus and obscurus 

 (=wrighti), but also between obscurus and hammondi, extremely 

 small, dark-colored examples of hammondi at the one extreme, 

 and large gray-colored specimens of griseus at the other, with 

 wrighti occupying middle ground; all of which is abundantly 

 illustrated in the collections of this Museum. As pointed out by 

 the above author, however, species of Empidonax with difficulty 

 distinguished in the cabinet skin, may be perfectly distinct forms. 

 and it seems advisable for the present to treat the above three 

 species as such. 



Apparently nothing is known of the nesting habits of E. 

 grist us, the published breeding ranges being merely general 

 statements, with no precise data to support them. The observed 

 facts bearing on the migration and winter home of the species 

 do not tend to shed any light on the probable breeding ground 

 of this large, pale-colored Empidonax. It is generally stated to 

 breed commonly in southern Arizona, on just what grounds is 

 unknown to us. but in this connection mention of a specimen 

 in juvenal plumage (no. 5865. coll. II. S. Swarth). apparently 

 referable to E. grist us, taken in that region, may be of interest. 

 This bird, a juvenal female, was secured in the foothills of the 

 Huachuca .Mountains. October 1, 1907. evidently a very late- 

 hatched bird, and iii itself no proof whatever of the species 

 breeding in the immediate vicinity. Compared with juvenals 

 of wrighti it shows differences exactly comparable with those dis- 

 tinguishing adults of the two forms — decidedly grayer colora- 

 tion, and longer, more slender bill, with conspicuously lighter 

 colored lower mandible. It is quite unlike any juvenals at hand 

 from the mountains of southern California, and the Museum con- 

 tains a number in comparable plumage. These well-marked 

 characters appearing in the juvenal plumage strongly support 

 the idea of the specific distinction of E. griseus. 



The Wright flycatcher was found breeding in abundance in 

 the higher parts of the San Jacinto Mountains. On Santa Rosa 

 Mountain it occurred down to the lowest edge of Transition, there 

 sharply defined, cumbers of the birds being seen or heard at the 

 Garnet Queen Mine, altitude 6000 feet. On the higher slopes 

 of Santa Rosa Peak and Toro Peak, though present, it was much 



