138 
April 21; next, April 22; common, April 26; Iowa City, Iowa, first 
seen April 22; Leeds Centre, Wis., first, April 21; next, April 24; 
Luck, Wis, first, April 28; next, April 30; common, May 11. The high 
character of the observers, and the commonness and unmistakability 
of the Nighthawk, render it hardly possible that there can be any 
mistakes in the observations, which by their very number substantiate 
one another. And it must be remembered in this connection that the 
temperature during the night of April 21 was high enough to inspire 
migration in any of the heat-loving species. At11p. m., April 21, the 
thermometer registered 62° F. at Saint Paul and 69° I’. at Davenport, 
The next warm wave reached the Upper Mississippi Valley April 28. 
The rest of the notes are quite regular. The first Nighthawk reached 
Peoria, Ill., May 6; Aledo, Ill., May 11; and May 14, 15, and 16 the 
first was recorded from Unadilla, Nebr.; Des Moines, lowa; Waukon, 
Iowa; Lake Mills, Wis.; Milwaukee, Wis.; New Cassel, Wis.; La Crosse, 
Wis.; Durand, Wis.; River Falls, Wis.; Rochester, Minn., and Elk 
River, Minn. May 19 it was reported from Heron Lake, Minn.; May 
20 from Linwood, Nebr., and Huron, Dak.; May 23 from Argusville, 
Dak.; Menoken, Dak.; Two Rivers, Manitoba, and Oak Point, Mani- 
toba, though at this last place it had been first noted May 19. 
In the fall of 1885 the last was seen at Elk River, Minn., September 
20; at River Falls, Wis., September 15; Lanesboro, Minn., September 
18; Grinnell, Iowa, October 10; Iowa City, lowa, September 20; and 
Fayette, Mo., September 19. The first was seen at Gainesville, Tex., 
October 6, and the last November 27. At Saint Louis, Mo., migration 
began August 17. Great movements were noted during the evenings 
of August 21 to 23, and again August 27. Fifty were seen going south- 
east at 5 p. m., September 15, and the last passed October 3. 
420 a. Chordeiles virginianus henryi (Cass.). [337a.] Western Nighthawk. 
A. common summer resident in western Manitoba and the Great Plains; 
common in middle and western Kansas (Goss). The records of this 
subspecies, which is the form inhabiting the dry western Plains, indicate 
quite a regular migration. In the spring of 1884 it was reported from 
Gainesville, Tex., April 29; Darlington, Ind. Ter., May 4; Ellsworth, 
Kans., May 9; Ellis, Kans., May 10; and Menoken, Dak., May 23. These 
records indicate that the species performed its northward migration in 
the spring of 1884 at the high rate of 34 miles a day for a distance of 
upwards of 900 miles. Few species exceed the present in the extent of 
its wanderings, its migrations extending nearly 4,000 miles—from Brazil 
to the Arctic regions. It is found as far east as Vermillion, in south- 
eastern Dakota, where it is a common summer resident, and where the 
eastern Nighthawk occurs in migration only. In the spring of 1885 
the only record received concerning the Western Nighthawk was its 
arrival at San Angelo, Tex., April28, Mr. Lloyd says it probably breeds 
on the plains in Texas. Several specimens have been recorded from as 
far east as Waukegan, II]. (Nelson). 
