Vol. XV 

 i8g8 



1 KiDGW w, Vcscn'p/ioti of a A'civ lliuinnhiglnrd. 325 



DESCRIPTION OF A NEW SPECIES OF HUMMING- 

 BIRD FROM ARIZONA. 



BY ROBERT RIDGWAY. 

 (By permission of tlie Secretary of the Smithsonian Institution. J' 



Atthis morcomi, sp. nov. Morcoim's Hum.mingiuru. 



Adult fejtiale (Type, No. 153SS6, U. S. Nat. Mus.. Huachuca Mts., 

 Arizona, July 2, 1896; H. G. Rising) : Above bright bronzy green, duller 

 and inclining to grayish brown on top of head, especially forehead; 

 remiges plain purplish dusky; middle pair of rectrices mainly bronzy 

 green, but much tinged with rufous on basal half, the outer web rather 

 broadly edged with the same nearly to tip ; rest of tail-feathers clear 

 cinnamon-rufous for basal half, this succeeded by a narrow bar of metal- 

 lic green, then uniform black for about .20 of an inch, the tip white; 

 this white tip broadest (about .20 wide) an outermost feather, obsolete 

 on the fourth. Under parts white, except sides and flanks, which are 

 light cinnamon-rufous, the under tail-coverts being very faintly tinged- 

 with the same ; whole throat marked w-ith small tear-shaped streaks of 

 dull bronze-green or olive-bronze, larger and more spot-like posteriorly. 

 Length (before skinning), 2.95 ; wing, 140; tail, 0.77 ; exposed culmen 

 0.50. 



Another adult female collected at same time andTplace differs in entire 

 absence of streaks or spots on throat (though the sides of the neck are 

 somewhat spotted) and in having the under tail-coverts more distinctly 

 tinged with pale cinnamon-rufous. Length (before skinning), 3.02 ; 

 Aving^, 1.50; tail, 0.80; exposed culmen, 0.50. 



The adult male of this species is unfortunately unknown. The 

 adult female differs from that of A. heloisa in being pure bronze- 

 green above instead of almost coppery bronze inclining ta 

 greenish only on upper tail-coverts and middle tail-feathers ; in 

 having the cinnamon-rufous on basal portion of the tail far more 

 extensive, there being more on the middle retrices in A. heloisa^ 

 while on the others it occupies very much less than the basal 

 half, and is entirely hidden by the coverts ; the sides and flanks 

 are less deeply, and apparently less extensively, cinnamon-rufous, 

 and the under tail-coverts are white or but very faintly buffy, 

 instead of being deep cinnamon-buff. 



