Nov., x9o5[ ATRATUS VERSUS MEGALONYX x73 colored, and with white markings on tail, wing coverts and scapulars, more extensive; rump grayish; wing and tail longer than in me?alony:r. TYPES--c? adult; no 3972, coll. H. S.S.; Miller Canyon, Huachuca Mountains, Arizona; May 20, I9O3; collected by H. S. Swarth. DESCRIPtIoN--Head and neck all around, black; lower breast and abdomen, white; sides, chestnut, paler than in inegalony:v, with a few partly concealed black markings on the edge, be- tween the chestnut of the sides and the white belly; under tail coverts, pale fulvous. Wings, black; greater and middle coverts broadly tipped with white, forming two bars across wing; outer web of scapulars, white, except for an almost imperceptible edging of black; interscapulars with white spot on outer web; size of spots decreasing toward middle of back, but very few feathers on the back not showing some white markings. Rump, grayish, in marked contrast to the back. Three outer tail feathers tipped with white; lateral ones with outer web white for about terminal third. Length 224. aAlar expanse 29o. ewing 9 I. Tail Io 9. White spot on lateral tail feathers 35. ? adult; no. 3875, co11. H. S. S.; Miller Canyon, Huachuca Mountains, Arizona; May 5, ?9o3; collected by H. S. Swarth. DESCR?P?'ioN--Generally similar to the male, but black of head, neck, back, etc., paler, more slaty. Chestnut of sides, paler. As compared with female ntegalony:r the chestnut sides are appreciably paler; white areas on wings, scapulars, etc., much more extensive; and the inter- scapulars are nearly all with white markings on the outer web. Length ?5- aAlar expanse 27o. ewing 86. Tail IOI. White spot on lateral tail feather 27. YouNG--The only two juveniles of mortlariats in my possession are not sexed, but compared with juveniles of megalony_v of both sexes, from Fort Tejon and Pasadena, all in the streaked plumage, they are appreciably paler, with wing bars broader, and white spot on tip of lateral tail feather, much longer. ME.?StJREM ENTS-- 5 ? ? Los Angeles Co., Cal. 7 ? ? Mt. Pinos, Cal. 3 ? ? Monterey, Cal. - Wing 86.2 85.4 83.6 White spot on Tail outer tail feather 97. i 24. 97.7 25.6 96.6 23.3 93.I ?t.4 ?o6.5 3t.2 91.6 22.I 91.2 20. 5 96.5 ?9. 97.2 28.6 to ? ? Palo Alto, Cal. (P. in.falcifer) 83.8 17 ? c? S. Arizona and New Mexico (P.m. montanus) 92.2 25 ? ? Los Angeles Co., Cal. 81.3 4 ? ?? Mr. Pinos, Cal. 8i.? 2 ? ? Monterey, Cal. 80.5 9 ? ?? Arizona and New Mexico (?. m. montanus) 84.6 R?NG?--The higher mountains of eastern Arizona, eastern California ? central and southern Nevada and Utah, western Colorado and New Mexico, south into northern Mexico. The western- most extension of the species in Arizone might be indicated by a lihe drawn from the Santa Rita to the Hualapai Mountains. Specimens of montanus were examined from the following locali- ties: Huachuca Mountains and Fort Verde, Arizona; Rincon and Fort Union, New Mexico; Fort Loveland, Colorado; Provo, Utah; and West Minaca, Chihuahua, Mexico. Besides the easily appreciable difference in color and proportion between megalonyx and montanus, there is a remarkable difference in the habits of the two races. Y[egalonyx is resident throughout its range in California, where it is found from the sea level well upintothe mountains; "up to the limit of the undergrowth" (Grinnell, Pub. No. ?. Pasadena Acad. Sci., 40); "observed only below 6,500 feet" on Mt. Pinos (Grinnell, Auk, XXII, i9o 5, 389). It is probably more abundant in the willow thickets of the lowlands and along the streams in the lower foothills than anywhere else, and is strictly resident, the only migratory movement what- ever being a partial descent from the higher parts of its range in midwinter. A/[ontanus is found in the mountains only, of Arizona, New Mexico, etc., where it is resident; and I have never seen it below 5,ooo and but seldom below 5,500 feet. In the ranges I visited I found it equally distributed from 5,5o0 to ?o,ooo feet, and even when the snow was deep on the ground the birds did not descend into the foothills. I can find no record of the occurrence of this bird anywhere in Arizona or New Mexico except in the mountains, nor does it seem to have ever Measurements from freshly killed specimen in millimeters.
