38 BIRDS OF ILLINOIS. 



ALLEN, J. A. Notes on birds observed in Northern Illinois, in 

 June, 1867. <Mem. Boston Soc. Nat. Hist., I., 1868, pp. 502-522. 

 [9A species.] 



1872. 



RIDGWAY, ROBERT. New birds in Southern Illinois. <Am. Nat., 

 July, 1872, pp. 430-431. [Vireo bellii, Peucaa astivalis, (=P. <estivalis 

 bachmani) Cyanospiza (=Passerina) ciris, Asturnia plagiata and Falco 

 polyagrus added to the fauna of the State (Fox Prairie, Richland 

 county).] 



1873. 



RIDGWAY, ROBERT. The Prairie Birds of Southern Illinois. <Am. 

 Nat., VIL, April, 1873, pp. 197-203. [Based on observations made 

 on Fox Prairie, Richland county, in June and August, 1871.] 



1874. 



RIDGWAY ROBERT. Catalogue of the birds ascertained to occur in 

 Illinois. <Ann. Lye. Nat. Hist., N. Y., X., January, 1874, pp. 364- 

 394. [A list of 311 species, with range of each within the State 

 approximately indicated.] 



RIDGWAY, ROBERT. The Lower Wabash Valley, considered in its 

 relation to the Faunal Districts of the Eastern Region of North 

 America; with a synopsis of its Avian Fauna. <Pr. Boston Soc. 

 Nat. Hist., XVI., February 18, 1874, pp. 304-332. 



"GENERAL SUMMARY." 



["Found Irrespective of season 77 



Found only in summer 92 



Found only in winter 47 



Found only in spring and fall 71 



Total number of species 288 



Number of species breeding, about 165 



Number of species wintering, about 155"] 



COUES, E. Birds of Illinois. < Field and Stream (Chicago), May 

 2, 1874. [A review of Ridgway's "Catalogue of the Birds ascer- 

 tained to occur in Illinois," in Ann. Lye. N. Y., January, 1874, 

 pp. 364-394.] 



