106 



6trag:8lii)g flocks from October 1st to 10th, and remains nntil the first 

 of May. During the last of Marcli and first of April, large straggling 

 flocks pass north. An unnsually large flight took place the 20th of 

 March, 1873. A continuous series of large flocks occupied over two 

 hours in passing. Those remaining after the middle of April are in 

 breeding plumage. 



94. P. pietus Sicains. Paixtki) LoNGsrun. Common migrant. 

 March 30th, 1875, near Calumet Lake, I found a flock containing about 

 seventy-five individuals of this species. Their hal)its were quite sim- 

 ilar to those of P. lapponicus while upon the ground, except that wliilo 

 the latter species preferred the wet portions of the prairie, the former 

 were found only about the higher portions. When flushed they inva- 

 riably uttered a sharp clicking note, rapidly repeated several times. 

 When driven from their feeding-place by my approach, they would 

 rise, in a loose flock, and after wheeling about a few times start ofl" in 



.a direct line, gradually rising higher nntil they disappeared. After a 

 short time their peculiar note would be heard, and darting down from 

 a considerable height they would alight near the place from which 

 they were driven. Allliongh the flocks of P. pietus and F. lajiponkus 

 often became mingled while flying over the prairie, I did not see thera 

 alight together. 



Genus Pyrgita Cnvier. 



95. P. domestiea Cuv. Housk Si'Aunow. Introduced into Chi- 

 cago a few years since and has become very numerous throughout 

 the city. 



Genus Passerculus Bonap. 



96. P. savanna Bonap. Savanna SrAiinow. Plentiful during 

 migrations, from April 1st to i\Iay 20lli, and September 15th to Octo- 

 ber 25lh. Not an uncommon summer resident. 



Genus Pooceetes Bd. 



97. P. gramineus Bd Gijass Finch. Abundant summer resi- 

 dent. Arrives iMarch 2aih to Aprd IOlIi, and departs the last of Sep- 

 tember. Lai'gc numbers nest on the ground among the junipers and 

 other low bashes along the Lake shore. 



Gcnns Ammodromus Sw. 



98. A. 'h.ensiowi Bunap. IIknslow's Bunting. Rather common 

 snnuncr resident upon the prairies. xVrrives JMay 12lh to 20lh, and 

 leaves the lirst of Septemljer. A very inconspicuous species that 

 may be easily overloola'd. lias a peculiar, weak, squeaky song, con- 

 sisting of several short notes. Nests the last of JNIa}'. 



99. A. lecontei Bonap. Li:conti:'s Buniing. A rare migrant. 



