Alder Flycatcher 275 
and leaves again late in September. It has been recorded from Boulder 
co., breeding at 5,500 feet (Gale), Limon and El Paso co. (Aiken) ; Baca 
co. (Warren), Salida, May 17th (Frey), Pueblo, Fort Garland, 7,900 feet, 
and Pagosa Springs, 7,100 feet (Henshaw), and San Juan co. (Drew). 
Habits.—This little Flycatcher is chiefly to be met 
with among the willows and alders which fringe so many 
of the streams, both on the plains and in the lower moun- 
tain valleys and parks; it is shy, quick and nervous, 
constantly flicking its tail and catching insects, and its 
call is a sharp single ‘“ Whit.” 
Dennis Gale found it breeding in the alder bushes, 
along a stream in Boulder co. at about 5,500 feet, on 
July 2nd; the nest contained five eggs, one of which 
belonged to a Cow-bird. The eggs are creamy-white, 
moderately spotted with vinaceous and ferruginous ; 
they measure about °70 x ‘53. 
Alder Flycatcher. Hmpidonax trailli alnorum. 
A.0.U. Checklist no 466a. 
Description.—Closely resembling Z. traili, but the general colour 
above, including the sides of the head, very distinctly brighter greenish- 
olive; below, the breast clearly washed with greenish-olive, and the 
flanks and abdomen a brighter shade of yellow; bill distinctly 
smaller, about -45 instead of -50, and the lower mandible much paler, 
almost white. 
Distribution.—This species replaces Traill’s Flycatcher in north- 
eastern North America, where it breeds from the Yukon to the 
New England States and the Alleghanies in Maryland; it migrates 
south in winter to south-eastern Mexico, Central America, and 
Ecuador. 
A Flycatcher obtained by Aiken near Limon in Lincoln co., May 
27th, 1905, appears to be an undoubted example of this subspecies ; 
it is probably a straggler from the general line of migration, and is so 
far the only record from Colorado. It was identified by Ridgway. 
Least Flycatcher. Hmpidonax minimus. 
A.O.U. Checklist no 467—Colorado Records—Baird, Brewer & 
Ridgway 74, vol. iii., p. 519; Henshaw 75, p. 358; Allen & Brewster 
83, p. 195; Drew 85, p. 17; Morrison 89, p. 146; Cooke 97, pp. 19, 
89; Warren 06, p. 21. 
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