322 Mr. J.Gould on two new Species of Humming-birds. 
forms the second head of the fourth dorsal, while the fibular 
constitutes the abductor minimi digiti. Pay 
Thus we find that all the museles of the manus and pes may 
be reduced into a regular ordinal series. The only supple- 
mental muscles to these are the lateralizers of the m als, 
of which two are usually present :—one an opponens of the 
metacarpal of the thumb, often present as an accidental variety 
in the pes ; and secondly the lateralizer of the fifth metatarsal 
bone, present in the foot as the “abductor ossis metacarpi 
quinti”’ muscle of Wood, Huxley, and Flower. Perhaps there 
may be a complete series of these in a typical limb; but I am 
not aware of any others being present in any individual animal. 
XL.—Deseriptions of two New Species of Humming-birds. 
By JOHN GoULD, Esq., F.R.S. 
Eriocnemis smaragdinipectus. 
Head and upper surface dullish grass-green ; rump and upper 
tail-coverts resplendently luminous yellowish green; on 
_ the throat a patch of violet-blue ; thence to the vent glittering 
grass-green ; under tail-coverts bright blue; thighs thickl 
Slothed with white downy feathers ; bill, primaries, and tail- 
feathers black. 
Total length 4 inches, bill +3, wing 27%, tail 12. 
Hab. Ecuador. ? 
Remark.—This species, which is from the neighbourhood 
of Quito, is very closely allied to Hriocnemis vestita, but differs 
from that bird in the green of the breast commencing imme- 
diately below the blue throat-spot, whereas in fine old males 
of H. vestita, when viewed in bright sunlight, a black band 
is seen separating the two colours. It is true that this band 
is green in certain lights; but the feathers are of a different 
structure to those of the Quitan species. Taking the average 
of seven specimens of both kinds, I find the Z. smaragdinipectus 
has a rather longer bill and somewhat shorter wing than the £. 
vestita ; in all other respects their dimensions are very similar. 
The green of the abdomen of the former is more pure, or not 
so yellow as the same part of the latter; in the gorgeous 
colouring of the rump perhaps the Quitan bird is somewhat 
less resplendent than the Bogotan LH. vestita. I have ample 
materials at my disposal for determining the distinctness of 
the two birds; and, however similar they may be, there are 
sufficient tangible characters by which each may be recog- 
nized, and to show that they are really different. 
