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1873. 
11. Ridgway, Robert. — The Prairie Birds of Southern Illinois. <Am. 
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1874. 
12. Ridgway, Robert.— Catalogue of the birds ascertained to occur in 
Illinois. <Ann. Lye. Nat. Hist., N. Y., X., January, 1874, pp. 364-94. [A list 
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“GENERAL SUMMARY.” 
[“Found irrespective of season, ........ 77 
Found only in summer, ......... 92 
Found only in winter, .......... 47 
Found only in spring and fall, ........ 72 
Total number of species, ..... 288 
Number of species breeding, about ....... 155 
Number of species wintering, about ...... 155”] 
14. Coues, E. — Birds of Illinois. <Field and Stream [Chicago), May 2, 
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1876. 
15. Nelson, E. W. — Additions to the Avi-fauna of Illinois, with notes on 
other species of Illinois birds. <Bull. Nutt. Orn. Club, I., No. 2, July, 1876, 
pp. 39-44. [The species added ar e,Myiadestes townsendi, Waukegan, Decem- 
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B 
