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 Sept., 1918 181 DESCRIPTION OF A NEW SUBSPECIES OF CYANOLAEMUS CLEMENCIAE By HARRY C. OBERHOLSER XAMINATION of the series of Cyanolacmus clemenciae in the Biological Survey collection some time since disclosed the existence of a hitherto un- recognized subspecies. Further comparison with the other material in the United States National Museum now confirms the distinction first noted, which, it is but fair to state, Mr. Outram Bangs had independently discovered. Learn- ing, however, of the present writer's investigations, he courteously volunteered to relinquish his claim. Since the northern race of this species proves to be with- out a name, it may be called Cyanolaemus clemenciae bessophilus, subsp. nov. Chars. subsp.--Simllar to Cyanolaemus lemenciae clemeciae, but bill shorter; male with uppe parts duller, particularly on the rump, which is more washed with gray- ish; lower surface decidedly paler; and throat duller. Female duller above and paler below than the female of Cyanolaemus clemenciae cleme?ciae. Description.--Type, adult male, no. 140247, U.S. Nat. Mus.; Fly Park, Chiricahua Mountains, Arizona, June 8, 1894; A. K. Fisher. Pileum brownish olive, with a grayish tinge and a greenish metallic sheen, the forehead lighter; nape and back metallic oil green, the nape anteriorly and the back posteriorly somewhat bronzy; rump and the shorter upper tall-coverts, metallic Saccardo's olive, the feathers tipped narrowly with pale brownish gray; longer upper tail-coverts, and the tail-feathers, bluish black, becom- ing more brownish on the outer rectrices, the two outermost pairs broadly tipped with white; wings, including the greater and primary coverts, chaetura drab, with a purplish sheen; lesser wing-coverts metallic green, like the back; median wing-coverts chaetura drab, edged with dull metallic green, similar to that of the back; a short superciliary stripe dull white; a broad postocular streak, practically continuous with the superciliary stripe, white; sides of head and neck between fuscous and hair-brown, the latter glossed with the metallic green of the back; narrow rictal streak dull white; throat and chin me- tallic blue, between Vanderpoel's blue and Blanc's blu; breast and abdomen rather light brownish gray, the breast washed with metallic greenish, the abdomen lighter and more clearly gray; sides and flanks of the same color, but slightly washed with metallic bronzy greenish; flanks with a small tuft of pure white feathers; under tail-coverts mouse gray, tipped with dull white; axillars dull gray; under wing-coverts dull green like the back, but somewhat duller; edge of the wing narrowly pale brownish white. Measurements.--Male:  wing, 72-78.5 (average, 76.1) mm.; tail, 44.5-48.5 (45.8); exposed culmen, 21.5-23 (22.2). Female:  wing, 69.5 mm.; tail, 41-43.5 (average, 42.3); exposed culmen, 23.5-24.5(24L Geographic distribution.--Southwestern United States and Mexico. Breeds north to the Santa Catalina, Chiricahua, Huachuca, and Santa Rita mountains in southeastern Arizona; the San Luis Mountains in southwestern New Mexico; and the Chisos Moun- tains in central western Texas; and south to the Sierra Madre of the State of Chihua- hua, Mexico. Winters south to southeastern Mexico (Vera Cruz). Remarks.--This interesting new subspecies reaches apparently its greatest differ- entiation in Arizona and southwestern New Mexico. Birds from the Chisos Mountains in central western Texas show in some specimens a tendency toward typical Cyanolaemus clemenciae clemenciae, but are decidedly referable to Cyanolaemus cleenciae bessophi- lus. A single male from Guadalupe y Calvo, in the Sierra Madre, Chihuahua, Mexico, is intermediate, but is apparently nearer the northern race. This hummingbird is but a summer resident in the United States, and therefore undoubtedly winters in Mexico. Evidence of this is a specimen from Mirador, Vera Cruz. The type locality of Cyanolaemus clemeviae Lesson/ as given in the original de- scription, is Mexico, and the bird described is evidently the form breeding in central and southern Mexico. The bird introduced as Trocbilus topitzin by De la Llave ' refers also to the same race, so that the bird from Arizona is the one entitled to a new name. This division of Cyanolaemus clemenciae into two races restricts the distribution of Cyanolaemus clemnciae clemenciae to the area in northeastern, central, and southern Mexico extending north to central Nuevo Leon. Zacatecas, and Durango; west to Jalis- co; south to Mlchoacan and Oaxaca; and east to Vera Cruz. ison. Millimeter measurements of both races are added herewith for purposes of compar- eten specimens, from Arizona and New 1Vfexico. Two specimens. from New 1Vfexico. 3Hist. Nat. Ois.-[ouch., 1829, pp. xlv, 216, pl. LXX. :Registro Trimestre, II, no 5, January, 1833, p. 49 (Mexico).