150 U. S. P. R R. EXP. AND SURVEYS— ZOOLOGY — GENERAL REPORT. 
List of specimens. 
Catal. 
No 
Sex. 
lected. 
Whnice obtained 
No. 
Collected by 
Length. 
.7 win"' ' 
Wing. 
mt'r'un'd 
Remarks. 
C0U2 
6003 
6000 
6001 
5491 
5912 
3711 
6004 
3 
9 
Lt. G. K. Warren. 
7.12 
17.12 
4.50? 
5.90 
5.80 
Fresh.... 
Aug. 8, 1856 
Maj. Emory 
Atanam river, W. T... 
Aug. 30. 1853 
Gov. I. I. Stevens. 
5 
6 
590 
Dr. J. G. Cooper.. 
3 
.... 
6.10 
5.50 
5.80 
Nov. — , 1855 
8.00 
17.50 
Iris brown, bill 
black, feet gray. 
Colorado river, N. M. .. 
Feb. 23, 1854 
179 
k'pnnerlv & IWK11. 
177 do. 
5.90 
CHOKDKILES, Swain son. 
Swainson, Fauna Bor. Amer. II, 1831, 496. 
q h ver y small, the gape with very short feeble bristles. Wings very long and pointed, with the first quill nearly or 
quite equal to the second, and the primaries not emarginated on the inner edge. Tail long ; slightly forked in the North American 
species ; plumage rather compact. 
The described North American species of this genus are three in number, the smaller readily 
distinguishable by the rounded rufous spots on the webs of the quills, (C. texensis.) The others 
are larger and more closely related. 
Comparative measurements of sp>ecies. 
Catal. No. 
Species. 
Locality. 
m 
Length. 
Stretch of 
wings. 
Wing. 
Tail. 
Tarsus. 
Middle toe. 
Its claw 
alone. 
| Bill above. 
Along gape. 
Specimen 
measured. 
Remarks. 
Chordeiles virginianus . 
3 
8.70 
8.10 
8.30 
4.72 
0.62 
0.80 
0.28 
0.34 
1605 
do. 
1522 
do. 
5201 
do. 
9.50 
8.66 
24.50 
Q 
7.80 
0.60 
0.74 
0.24 
0.26 
0.94 
9.50 
23.60 
8.16 
do 
Above Fort Pierre. . 
3 
9.10 
9.25 
22.25 
7.56 
7.75 
4.58 
0.52 
0.20 
0.80 
Skin .... 
Point of bill broken. 
Rio Grande valley.. 
do 
Q 
7.80 
7.54 
7.87 
5.18 
4.84 
0.54 
0.50 
0.70 
0.68 
0.20 
1.08 
8.30 
7.87 
8.30 
0.20 
0.24 
0.82 
6010 
Chordeiles texensis .... 
o 
19 12 
do. 
4578 
do. 
Colorado river, Cal. 
6.90 
4.60 
0.52 
0.64 
0.18 
0.22 
0.84 
Skin .... 
Head off; (very 
poor specimen.) 
6011 
Eagle pass, Texas.. 
8.30 
8.22 
6.50 
4.16 
0.52 
0.74 
0.19 
0 26 
0.70 
3957 
do 
Sta. Catanna, Mex . 
19.00 
7.00 
7.00 
4.30 
0.52 
0.74 
0.22 
0.24 
0.80 
do. 
