130 
U S. P. R. R EXP. AND SURVEYS-ZOOLOGY-GENE UAL REPORT. 
Selasphorus. —Feathers of the throat much elongated laterally into a ruff. Lateral tail 
feathers much narrower than the middle ones, and linear in shape, or with the sides 
parallel to the end, which is rounded. Tail graduated or cuneate. Outer primary 
attenuated at the tip. Crown without red metallic scales. 
Atthis. —Similar to the last, hut the top of the head with metallic scales like the throat. 
The outer primary not attenuated. Tail emarginated or deeply forked. 
The following table exhibits the comparative measurements of the different North American 
species of humming bird : 
Comparative measurements of species. 
Catal. 
No. 
Species. 
Locality. 
Sex. 
Length. 
Stretch 
of wings. 
Wing. 
Tail. 
Tarsus. 
Bill 
above. 
Specimen 
measured. 
Remarks. 
523 
* 
4.52 
2.50 
1.70 
0.90 
2697 
o 
o 
4.46 
2.64 
1.72 
0.92 
1843 
V 
A 
3.14 
1.56 
1.26 
0.70 
997 
O 
O 
3.26 
1.74 
1.16 
0.80 
V 
3.75 
4.17 
1.83 
A 
3.32 
1.64 
1.14 
0.82 
2896 
A 
3.46 
1.54 
1.32 
0.68 
1943 
O 
3.54 
1.78 
1.24 
0.80 
6058 
3.24 
1.60 
1.32 
0.70 
6057 
3 24 
1.52 
1.24 
0.76 
Skin. 
9007 
s 
3.32 
1.94 
1.44 
0.80 
Orig. 197 
Bill broken .... 
6086 
s 
3.64 
1.92 
1.46 
0.80 
5501 
s 
3.60 
1.96 
1.50 
0.82 
6052 
Q 
3.84 
1.96 
1.31 
0.82 
6073 
S 
3.15 
1.76 
1.06 
0.15 
0.70 
6074 
Q 
3.05 
1.80 
0.73 
7967 
s 
3.30 
1.78 
0.72 
LAMPORNIS, Swainson, 
Lampornis, Swainson, Zoological Journal, 1827, 358. 
The single species of this genus assigned to the United States is readily distinguished by its 
generic characters from any other belonging to the same region. 
LAMPORNIS MANGO, Swainson. 
Black-throated Humming Bird. 
Trochilus mango, Linn. Syst. Nat. I, 1766, 171.— Audubon, Orn. Biog. II, 1834, 486 ; pi. 184.—Is. Birds America, 
IV, 1842, 186 ; pi. 251. 
Lampornis mango, Swainson, Zool. Journal, 1827, 358. 
Above and on the sides metallic green and golden. Beneath opaque velvety bluish black, this color narrowed on the breast 
by the encroachment of the green of the sides. Upper surface of wings and tail purplish black ; the latter with greenish 
reflections. All the tail feathers except the innermost purplish violet, abruptly margined with blackish. A tuft of downy 
white feathers under the wings, and around the tibia. 
Female quite similar, the black of the under parts replaced by white, with a narrow stripe of black down the middle of the 
hroat and belly. Length 4 50 inches ; wing 2.60 ; tail 1.7 
The female of this species is quite similar to the male, except as described. The tail is 
