HUMMINGBIRDS 239 



feather between the rufous and black, the fourth feather green but 

 marked with a terminal or subterminal spot of black, and edged with 

 rufous, tip often white. Male : length 4.00-4.25, wing 1.92- 

 2.05, tail 1.40-1. (iO, bill .(i2-.70. Female : length 4.10-4.70, 

 wing- 2.00-2.10. tail 1.45-1.50, bill .70-.T2. 



Remarks. — The females oi platycerciis and rufus must be 

 carefully discriminated. \\\ plat ycercus the middle tail feath- 

 ers are wholh* green, in rnfun brown at base ; in plat ycercus pig, 314. 

 the rufous of the outer feathers is basal and of less extent 

 than the black ; in rufus the rufous equals or exceeds the black ; in 

 platycercus the next to the middle feather is mainly green, in rufus the 

 rufous covers as much ground as the green, black, and white all together ; 

 in platycercus the outer feather is .25 broad, in rufis .12 broad. 



Distribution. — Breeds in Transition and Canadian zones of the Rocky 

 Mountain district from Idaho and Wyoming to mountains of Arizona and 

 New Mexico ; west to the JSierra Nevada ; migrates to Guatemala ; recorded 

 from Oakland. 



Nest. — Usually within 15 feet of the ground on branches of trees, 

 often overhanging a mountain stream, made of willow or cottonwood down 

 covered with lichen alone, or lichen, bark, leaves, and plant fibers. Eggs : 

 2, white. 



Food. — Insects found on flowers of Castilleia, Fouqueria, Gilia, Agave, 

 and others. 



Major Bendire says that the broad-tailed hummingbirds breed in 

 the lower foothills and valleys on their first arrival from the south, 

 but by the time the young are able to fly the flowers have ceased 

 blooming and the country is getting so dry that they go 'to the moun- 

 tain parks to raise their second broods. 



At 9000 feet in the Sacramento Mountains we found the birds 

 abundant the last of :May feeding from the gooseberry bushes. 

 The noise they made in bu/zing about the bushes and flying through 

 the air was a metallic rattle strikingly different from the noise made 

 by rvfus, colubris, aleu-andri, or any other hummingbird I had ever 

 heard. In addition to a squeaky little song the hummers had some 

 small staccato notes. 



When camped at Little Spring, San Francisco Mountain, Dr. Mer- 

 riam found platycercus very abundant. They came to the spring to 

 drink and bathe at dayliglit. He says: " They were like a swarm 

 of bees, buzzing about one's head and darting to and fro in every 

 direction. The air was full of them. They would drop down to 

 tlie water, dip their feet and bellies, and rise and shoot away as if 

 propelled by an unseen jiower. " 



433. Selasphorus rufus (dmel.). Rufoits Hi-mminokikd. 



Adult Utah. — (J(irg<'t fire red, orange, and bra.ssy green ; gttural body 

 color bright nddish broiru, glossed with bron/-'. gn'en on erown and sonu'- 

 tinies l)a(k, and fading to white next to gorget and on belly ; tail feathers 

 rufous, with dark mesial streak.s ; middle tail feather ])road. pointed at 

 ti\y, second from middle deeply notched on iumr hv/(. siunatid on outer web. 



