202 Brewster on a Collection of Arizona Birds. 



dead twigs protecting its exterior and a scanty lining of line 

 grasses. The female was sitting on four eggs, which were on 

 the point of hatching. The onlv specimen saved measures 1.13 

 X-S3. It is pale greenish-blue, absolutely without markings, 

 and closely resembles a Robin's egg. "The others were similar, 

 as were three eggs of a set taken in 1876, and two of one found 

 in 1880." 



Of the fifteen specimens collected only four have the bill wholly black. 

 With all the others there is more or less flesh-color, which, although usually 

 confined to the base and tip of the lower mandible, sometimes spreads 

 over nearly the whole of the bill below as well as encroaching on the 

 maxilla at the tomia, and occasionally even occupies a narrow central 

 space along the ridge of the culinen above the nostrils. Mr. Henshaw has 

 remarked on this feature, which he considers peculiar to young birds. If 

 this view be correct it must require several years for the bill to become 

 unicolor. 



98. Eremophila alpestris chrysolaema ( IVagl. ) Cones. 

 Mexican Shore Lark. — The onlv .Shore Lark in the collec- 

 tion, a young bird in tirst plumage, taken on the plains at the 

 base of the Santa Rita Mountains, has been referred b\- Mr. 

 Ridgwav to the above race. 



99. Tyrannus verticalis Say. Arkansas Flycatcher. 

 — Although this species was much less numerous than the follow- 

 ing, especialh after the spring migrants had gone, a few pairs 

 were found breeding about Camp Lowell, where a nest containing 

 three slightly incubated eggs was taken on June 20. The col- 

 lection includes skins from Tucson and Camp Lowell. 



100. Tyrannus vociferans Sivains. Cassin's Feycatcher. 

 — "Abundant in summer. Neither verticalis nor vociferans 

 winters in Arizona." Spechnens were collected at Tombstone. 

 Tucson, and among the Santa Rita Mountains. 



The peculiar attenuation of the primaries in this species has been freelv 

 commented on by authors, but no one seems to have noticed that this 

 character, at least as applied in diagnoses, is to be found in only the tnale 

 of T. vociferans. Nevertheless this is true of the somewhat large series 

 of specimens before me, among which there is a decided and verv constant 

 sexual difference in the shape of the outer four primary feathers. All the 

 adult males have them abruptly and deeply notched on the inner webs about 

 half an inch from the tip, the emargination extending more than half-wav to 

 the shaft and reducing the width of the feather, terminally, to about .12 of 

 an inch. In the females these feathers show no well-defined notching, the 

 tips being simply tapered, usually with, a slightly concave outline, although 

 the outline is sometimes actuallv rounded. A ^oimg male from Riverside. 



