130 U Ss. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
SriaspHorus.—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. 
Arruis.—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. . Species. Locality. Sex. Tengit| Stretch | Wing. Tail. |Tarsus.| Bill Specimen Remarks, 
No. ofwings. above. | measured. 
523 | Lampornis mango, ....| South America. . Skin... 
2697 |...000 GO. ccccccvecccces|cocces Os eccciscess Skin ...... 
1843 | Trochilus colubris...... Washington. ..seeseeee Skin ...... 
SOT iil Sasieisis dO. snccecccccecss Carlisle, Pa.....e.0. eee Skin 2.00.0. 
concer GO. wccccsicces cess Fresh..... 
Orig. 563) Trochilus alexandri .... Skin ...... 
2896 | Selasphorus rufus.,.... Skin ...... 
1943 Skin ...... 
6058 Skin\i...0s 
6057 San Francisco, Cal..... Skin ...... 
9007 MEXICO. sc ccc cece vce SKin ..eee 
Orig. 197|...... dO... .sseeee eeccer|caccccceccevencecs socees Skin 
6086 | Atthis anna......seeeee San Francisco......... Skin .. 
5501 |..c0- DOs (ate Petaluma, Cal. ........ Skin .. 
6052 |...... dO. wee .| San Francisco.......-. Skin .. 
6073 | Atthis costae «| New Mexico. ....0. cece Skin 
6074 |...00. dO. sess caas|accevedOs cocccesncesces| i | BOD) |cccecces| L180 [rcccccccleccccces| Oe73!|sccceccececs ee cece eeeeee 
T1967 | ceicee's (0 agaccerc=0 eoee| Guatemala .ooeee cevese 
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.—Avpuson, Orn. Biog. II, 1834, 486 ; pl. 184.—Is. Birds America, 
IV, 1842, 186; pl. 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 midale 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 
