174 Recently published Ornithological Works. 



The plates are engraved and coloured by the autlior himself. 

 Part 1 is devoted to Carpodacus purpureus, part 2 to Gonia- 

 phea"^ ludoviciana. 



22. Rklgway ou the Birds of Illinois. 



[Illinois State Laboratory of Natural Ilistoiy. — Bulletin No. 4. A 

 Revised Catalogue of tlie Birds ascertained to occur in Illinois. By 

 Robert Ridgway. 8vo. Bloomington, lU. : 1881.] 



Mr. Kidgway records the occurrence of 341 species of birds 

 in the State of Illinois^ adding about 30 to his last catalogue 

 of the same avifauna, published in 1874. Mr. Ridgway ob- 

 serves that " probably no inland state or territory not tra- 

 versed by lofty mountaipi-rangcs is equal to Illinois as regards 

 the richness and variety of its avian fauna.^^ 



23. Ridgway on the Desiderata of the U.S. National Museum. 



[List of Species of Middle and South-American Birds not contained in 

 tbe United States National Museum. By Robert Ridgway. Proc. U.S. 

 Nat. Mus. 1881, p. 165.] 



IVIr. Hidgway's title explains itself. Such of the defi- 

 ciencies as can be supplied by correspondents of the IViuseum 

 or of the Smithsonian Institution '' will be very thankfully 

 received,^^ 



24. Ridgivay on the Genus Centurus. 



[A Review of the Genus Centwus, Swainson. By Robert Ridgway. 

 Proc. U.S. Nat. Mus. 1881, p. 93.] 



Fourteen forms of Centurus are treated of in this paper as 

 " sufficiently distinct for definition/^ but " not more than six 

 can be said to be perfectly isolated, or to possess the require- 

 ments of perfectly distinct species." These six are the three 

 West-Indian species, C. radiolatus. C. superciliaris, and C. 

 striatus, and three continental ones, C. uropygiaUs, C. hypo- 

 polius, and C. elegans. Those which " certainly intergrade " 

 are C. aurifrons, C. santacruzi, C. dubius, and C. hoffnianni, 

 all of which, however, are " strongly characterized geogra- 



* On this generic term cf. infra, p. 183. 



