1905.] XATURAL SCIENXES OF PHILADELPHIA. 683 



floating drift and hawking flies and other insects from the steaming 

 surface of Colorado of a chilly morning." 



Pyrocephalus rubineus mexioanus (Scl.)- Vermilion Flycatcher. 



Several from the mouth of the Hardy, and also from Pescadoro 

 Slough. 



"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 wintiy landscape of the Colorado delta in Febru- 

 ary. The males on warm days were performing their whimsical little 

 flight songs and tumbling feats, but there was no other sign or sugges- 

 tion that this had anything to do with sexual excitement." 



Corvus corax sinuatus (Wagl.). American P.aven. 



One obtained at the mouth of the Hardy. 



"Numerous everj-where. Some of the ravens may have been the 

 white-necked species. While at Cocopah Major I was entertained by 

 the love antics and really wonderful medley of sounds which a love-sick 

 raven is able to make. Some of these are truly melodious modulations 

 of the so-called 'croak,' and run through Cfuite a slice of the gamut. 

 In addition to this they can tumble, twist, dive, soar and sport about 

 the fleeting form of their mate with all the abandon and daring of less 

 sedate and more elegant masters of the air." 



Molothrus ater obscurus (Gmel.)- Dwarf Cowbird. 



One example taken on the lower Colorado, above Colony. 



"They were associated with flocks of Redwings. Some were seen 

 near Pescadoro Slough." 



Agelaius phoenioeus sonoriensis Ridgw. Sonoran Redwing. 



Obtained along the Colorado above Colony, and at the mouth of the 

 Hardy, as well as at Pescadoro Slough. I find it very difficult to sepa- 

 rate this form from neutralis, and riuestion whether the two will prove 

 distinct when full series representing all seasonal variations are avail- 

 able for comparison. The specimens under consideration might be 

 either form so far as measurements go, but the stripes on the breast of 

 the females appear narrower than in San Diegan birds. 



Sturnella magna neglecta (And.). Western Meadow Lark. 



Several obtained about the mouth of the Hardy and one farther up 

 the river, all of them typical neglecta. 



"A rare bird except in open savannas along the Hardy river at two 

 or three points." 



