130 
U S. P. R. E EXP. AND SURVEYS ZOOLOGY — GENERAL 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, but 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 
Wing. 
Tail. 
Tarsus. 
above. 
measured. 
Remarks. 
523 
2697 
1843 
997 
Orig. 563 
2896 
1943 
6058 
6057 
9007 
Orig. 197 
6086 
5501 
6052 
6073 
6074 
7967 
Lampornis mango 
3 
9 
8 
Q 
8 
3 
o 3 
4.52 
4.46 
3.14 
3.26 
3.75 
3.32 
3.46 
3.54 
3.24 
3.24 
3.32 
2.50 
2.64 
1.56 
1.74 
1.83 
1.64 
1.54 
1.78 
1.60 
1.52 
1.94 
1.70 
1.72 
1.26 
1.16 
0.90 
0.92 
0.70 
0.80 
do 
do 
do 
Troeliilus alexandri .... 
do 
4.17 
1.14 
1.32 
1.24 
1.32 
1.24 
1.44 
0.82 
0.68 
0.80 
• 0.70 
0.76 
0.80 
do 
Selasphorus platycercus 
3 
Bill broken .... 
3 
3 
9 
3 
Q 
8 
3.64 
3.60 
3.84 
3.15 
3.05 
3.30 
1.92 
1.96 
1.96 
1.76 
1.80 
1.78 
1.46 
1.50 
1.31 
1.06 
0.80 
0.82 
0.82 
0.70 
0.73 
0.72 
do 
0.15 
do 
LAMPORNIS., Swain so n. 
Lampomis, 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. 
Troeliilus mango, Linn. Syst. Nat. I, 1766, 171.— Audubon, Orn. Biog. II, 1834,486 ; pi. 184.— 1b. Birds America, 
IV, 1842, 186 ; pi. 251. 
Lampomis 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 miduie 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 
