2IO Bkkwster on a Collection of Arizona Birds. 



individuals were secured, but neitlier the nest nor the remainder 

 of the brood — if indeed there were any more — could be found. 

 On the following day this episode was repeated, a second female 

 being found in attendance on another young bird of nearh' the 

 same age as that obtained on the previous occasion. 



308, $ ad., Tucson, April 29. Length, 4. So; extent, 7.20; wing, 2.28; 

 tail. 2.04; culmen, .40; tarsus, .55. '-Iris dark brown: bill black, basal 

 half of lower mandible reddish-brown ; legs black. Contents of stomach 

 worms and insects." 



313, $ ad., Tucson, May i. Length. 4.60: extent. 7.20; wing. i.2t^: 

 tail, 1.96; culmen, .42; tarsus. .56. 



446, $ ad., Tucson. May 28. Length, 4.50; extent, 6.70: wing, 2.04; 

 tail, 1.78; culmen, .40; tarsus, .52. Parent of the next. 



447, $ juv., first plumage, same locality and date. 



450, $ ad., Tucson, May 29. Length, 4.30; extent. 6.80. Parent of 

 the following. 



451, J juv.. first plumage, same locality and date. 



116. Trochilus alexandri Bonrc. d- Muh. Black- 

 chinned Hummingbird. — The first specimen met with was a 

 female which, with a nest and two eggs, was taken at Tucson on 

 April 23. The species was also found breeding among the 

 Santa Rita Mountains, as well as near Camp Lowell. At all 

 these points it was decidedly the most abundant of the Hum- 

 mingbirds. 



Six of the seven examples collected are females, and Mr. 

 Stephens remarks on the apparent absence of the males din-ing 

 the breeding season. 



The nest just mentioned, and another obtained April 28 in the 

 same locality, are now in my possession. Both were built in 

 willows, one being saddled on a small branch, while the other 

 rested lightly in the fork of a slender twig. Their construction 

 is homogeneous, the only material used being a creamy-white 

 down, probalily from willow catkins. One nest, however, has a 

 few delicate, faded leaves attached to its exterior. The eggs are 

 indistinguishable from those of T. colubris. The first set was 

 fresh, the second slightly incubated. 



117. Calypte costae {Bonrc.) Gonid. Co.sta'.s Hum- 

 mingbird. 



289, ? ad.. Tucson, April 26. Length. 3.70: extent, 4.60. -'Iris dark 

 brown ; bill and legs black." 



294, $ im., Tucson, April 27. Length, 3.55; extent. 4.52. This speci- 

 men lacks the ruffs of the adult male, but has a patch of violet feathers on 

 the centre of the throat. 



