Mr. J. Gould on two new Species of Humming-Birds. 195 



neck, showing how they adapt themselves to the elongate cha- 

 racter of the vertebrpe and slender nuchal region generally. 

 The numerals I. to VII. are placed opposite the cervical ver- 

 tebrae. It. a. ma, rectus anticus major of right side ; R.a.miy 

 rectus anticus minor of left side ; Ic, longus coUi ; m, muscular 

 bellies intei-woven with each other. 



Fig. 5. Semidiagrammatic view of the scapular muscles seen from above 

 or on their narrow upper edge : b, biceps tendon where passing 

 over head of humerus ; I.s, infraspinatus tendon ; S.s, supra- 

 spinatus muscle ; JUp. s, episubscapularis ; S, superior border of 

 subscapularis. 



Fiff. 6. A transverse vertical section of the spinal elastic ligament and 

 muscles at the second dorsal vertebra. 



Fiff. 7. Similar slice of the ligament at the seventh cervical, both nat. 

 size, from old (^ : In, In*, ligamentum nuchse ; 7?i, muscle in sec- 

 tion ; r, vascular channels. 



XXI. — Descriptions of two new Species of Summing- Birds. 

 By John Gould, F.R.S. &c. 



Heliangelus micraster^ Goiild. 



Bill black ; on the forehead a band of glittering green ; 

 crown of the head, all the upper surface of the body, and the 

 shoulders bronzy green ; chest and flanks of the same hue, 

 but rather brighter; centre of the abdomen mottled brown 

 and green ; on the throat an exceedingly lustrous spot of 

 orange-scarlet, exceeding in brilliancy the colouring of the 

 same part of any other member of this beautiful genus yet 

 discovered ; wings purplish brown ; four central tail-feathers 

 bronzy green, the remainder black ; thighs brown ; under 

 tail-coverts white ; feet dark brown, nearly black. 



Total length 3| inches; bill |, wing 2^, tail 2g, tarsi ^. 



Habitat. St. Lucas, near Loxa, in Ecuador. 



Remark. I have in my collection two specimens of this new 

 bird, one of which is much brighter and finer than the other. 

 They were collected in the locality above mentioned, by one 

 of Mr. Clarence Buckley's hunters. In size this species is 

 much smaller than any other member of the genus, even than 

 Heliangelus mavors. My specimens differ also from all of 

 them in the absence of a white or buff band across the chest, 

 in which respect they assimilate to //. Parzudahij but not 

 in the forked tail and other respects. I think it probable 

 they are somewhat immature, and that, beautiful as they are, 

 fully adult examples will be still finer. 



Chlorostilhon pumilus, Gould. 



Bill black ; crown and the whole of the under surface glit- 

 tering bronzy green, with a wash of blue on the chest ; back 

 and upper tail-coverts green, becoming somewhat brighter on 



14* 



