150 
U. S. P. R R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
List of specimens. 
Catal. 
No 
Sex. 
Locality. 
When col¬ 
lected. 
Whence obtained. 
Orig. 
No. 
Collected by— 
Length. 
Stretch 
of wings. 
Wing. 
Specimen 
measured. 
Remarks. 
8876 
3 
7.12 
17.12 
4.50? 
5200 
Aug. 8, 1856 
5.70 
6002 
9 
Mr. Clark. 
5.60 
6003 
Dr. T. C. Henry.. 
5.90 
6000 
5 
5.80 
6001 
6 
5491 
3 
590 
6.10 
5912 
8.00 
17.50 
5.50 
Iris brown, bill 
black, feet gray. 
3711 
5.80 
6004 
Colorado river, N. SI. .. 
Feb. 23, 1854 
179 
hausen......... 
177 
5.90 
Eyes black..... 
CHORDEILES, Swain son. 
Swainson, Fauna Bor. Amer. II, 1831, 496. 
q h> _gin 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 species. 
Catal. No. 
Species. 
Locality. 
Sex. 
Length. 
Stretch of 
wings. 
Wing. 
Tail. 
Tarsus. 
Middle toe. 
Its claw 
alone. 
Bill above. 
Along gape. 
Specimen 
measured. 
Remarks. 
1605 
do. 
1522 
do. 
5201 
do. 
6698 
6010 
do. 
4578 
do. 
6011 
3957 
do. 
Chordeiles virginianus . 
3 
8.70 
9.50 
8.66 
9.50 
9.10 
9.25 
8.10 
8.30 
7.80 
8.16 
7.56 
7.75 
7.80 
7.54 
7.87 
6.90 
6.50 
7.00 
7.00 
4.72 
0.62 
0.80 
0.28 
0.34 
0.98 
Skin .... 
24.50 
Fresh ... 
9 
4.60 
0.60 
0.74 
0.24 
0.26 
0.94 
Skin .... 
23.60 
Fresh ... 
Above Fort Pierre.. 
3 
4.58 
0.52 
0.68 
0.20 
0.80 
Skin .... 
Fresh ... 
Point of bill broken. 
22.25 
Chordeiles henryi . 
Chordeiles texensis .... 
Rio Grande valley.. 
9 
O 
5.18 
4.84 
0.54 
0.50 
0.70 
0.68 
0.20 
0.20 
0.28 
0.24 
1.08 
0.82 
8.30 
7.87 
8.30 
8.30 
8.22 
8.75 
19 12 
Fresh ... 
Colorado river, Cal. 
Eagle pass,Texas.. 
Sta. Catarina, Mex. 
4.60 
4.16 
4.30 
0.52 
0.52 
0.52 
0.64 
0.74 
0.74 
0.18 
0.19 
0.22 
0.22 
0.26 
0.24 
0.84 
0.70 
0.80 
Skin .... 
Head off; (very 
poor specimen.) 
. 
19.00 
Fresh ... 
1 
