92 



from the Colorado Valley above Yuma. For instance, 

 the minimum measurements among fourteen male 

 Colorado Valley birds are, wing 98 mm., tail 92 

 (Grinnell, op, cit., 148). The averaged measurements 

 of my three males are, wing 97.5, tail 86.7. 



79. Sayornis sayus. Say's Phcebe. — Frequently observed 



by Rhoads on bluffs above the bottom-land. He 

 collected two specimens. 



80. Sayornis nigricans. Black Phcebe. — Collected by 



Rhoads at the mouth of the Hardy and elsewhere in 

 the delta. He writes, ^'One of the most lively bits of 

 bird life, which relieved the tedium of our boat 

 journey, was the frequent sight of these birds sitting 

 on the floating drift and hawking flies and other 

 insects from the steaming surface of Colorado of a 

 chilly morning." 



81. Myiochanes richardsoni richardsoni. Western Wood 



Pewee. — One seen in a grove of eucalyptus trees, in 

 the cultivated country south of Mexicali, on April 17. 



82. Pyrocephalus rubinus mexicanus. Vermilion Fly- 



catcher. — Seen about six times in April, always on 

 overflow land along the Hardy River. A favorite 

 perch for the males was on dead limbs overhanging 

 the stream. One in brilliant red plumage, but with 

 a white chin, was taken on March 30. 



Rhoads collected several, and entered the following 

 account in his journal: ''We were sure to find one or 

 more pairs of these in the mesquite groves. They 

 seem to continue their conjugal attachments all winter, 

 some pairs being inseparable. They furnished the 

 only strong bit of color to be seen in the wintry 

 landscape of the Colorado delta in February. The 

 males on warm days were performing their whimsical 

 little flight songs and tumbling feats, but there was 

 no other sign or suggestion that this had anything to 

 do with sexual excitement." 



83. Otocoris alpestris pallida. Sonora Horned Lark. — 



Larks, presumably of this form, were first observed 



