Bulletins 



50. The birds of North and Middle America: A descriptive catalog of the higher 

 groups, genera, species, and subspecies of birds known to occur in North 

 America, from the Arctic lands to the Isthmus of Panama, the West Indies 

 and other islands of the Caribbean Sea, and the Galdpagos Archipelago 

 (continued; for earlier parts, see Bulletin 193). 



Part 11. Families Cathartidae, Accipitridae, Pandionidae, and Falconi- 

 dae. By Herbert Friedmann. 8vo, pp. xiii + 793, 51 figs. 

 September 29, 1950. [Out of print.] 

 82. A monograph of the existing crinoids. By Austin Hobart Clark. Vol. 1. 

 The comatulids (continued; for earlier parts, see Bulletin 193): 



Part 4b. Superfamily Mariametrida (concluded — the family Colobome- 

 tridae) and superfamily Tropiometrida (except the families 

 Thalassometridae and Charitometridae) . Quarto, pp. viii + 

 473, 43 pis. (figs. 1-220). October 9, 1947. 

 Part 4c. Superfamily Tropiometrida (the families Thalassometridae and 

 Charitometridae). Quarto, pp. vii + 383, 32 pis., 104 figs. 

 August 16, 1950. 

 100. Contributions to the biology of the Philippine Archipelago and adjacent 

 regions (continued; for earlier volumes and parts, see Bulletin 193): 

 Vol. 14. Part 3. Report on the Echinoidea collected by the United States 

 Fisheries steamer Albatross during the Philippine Expedition, 

 1907-1910. Part 3: The Echinoneidea, Echinolampadidae, Clyp- 

 eastridae, Arachnoididae, Laganidae, Fibulariidae, Urechinidae, 

 Echinocorythidae, Palaeostomatidae, Micrasteridae, Palaeo- 

 pneustidae, Hemiasteridae, and Spatangidae. By Theodor 

 Mortensen. 8vo, pp. iii + 93-140. October 29, 1948. 

 Vol. 14. Part 4. Copepods gathered by the United States Fisheries steamer 

 Albatross from 1887 to 1909, chiefly in the Pacific Ocean. By 

 Charles Branch Wilson. 8vo, pp. ix + 141-441, pis. 2-36, (figs. 

 1-561). October 17, 1950. 

 185. Checklist of the coleopterous insects of Mexico, Central America, the West 

 Indies, and South America. Compiled by Richard E. Blackwelder 

 (continued; for earlier parts see Bulletin 193): 



Part 5. 8vo, pp. iv + 765-925. October 31, 1947. 

 Part 6. 8vo, pp. vii + 927-1492. May 15, 1957. 



193. A list and index of the publications of the United States National Museum 



(1875-1946). Compiled in the Editorial Division, Smithsonian Institu- 

 tion. 8vo, pp. iv + 306. December 19, 1947. [Out of print.] 



194. An annotated checklist and key to the Amphibia of Mexico. By Hobart M. 



Smith and Edward H. Taylor. 8vo, pp. iv + 118. June 17, 1948. 

 [Out of print.] 



195. Life histories of North American nuthatches, wrens, thrashers, and their 



allies. Order Passeriformes. By Arthur Cleveland Bent. 8vo, pp. 

 xi + 475, 90 pis. July 7, 1948. [Out of print.] 



196. Life histories of North American thrushes, kinglets, and their allies. Order 



Passeriformes. By Arthur Cleveland Bent. 8vo, pp. viii + 454, 51 pis. 

 June 28, 1949. [Out of print.] 

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