161. On the Anatomy of Ozobranchus branchiatus (Menzies). By W. G. 



MacCallum and G. A. MacCallum, 1918, Bulletin, XXXVIII, 



Art. 12, pp. 395-408, Pis. xxxiii-xxxviii. 60c. 



162. A SjTiopsis of the Nearctic Species of the Genus Drosophila (Sensu 



Lato). By A. H. Sturtevant, 1918, Bulletin, XXXVIII, Art. 14, 



pp. 441-446. 10c. 



163. The Termites of Panama and British Guiana. By Nathan Banks, 



1918, Bulletin, XXXVIII, Art. 17, pp. 659-667, PI. u, 2 text 

 figures. 25c. 



164. Bees from British Guiana. By T. D. A. Cockerel!, 1918, Bulletin, 



XXXyill, Art. 20, pp. 685^90. • 15c. 



165. Illustrations of the North American Species of the Genus Catocala by 



Wm. Beutenmiiller, with Additional Plates and Text. By Wm. 

 Barnes and J. McDunnough, 1918, Memoirs, N. S., Ill, part 1, 

 pp. 1-47, Pis. i-xxii. $9.00 



166. A Revision of the Vespidse of the Belgian Congo Based on the Collec- 



tion of the American Museum Congo Expedition, with a List of 

 Ethiopian Diplopterous Wasps. By J. Bequaert, 1918, Bulletin, 

 XXXIX, Art. 1, pp. 1-384, Pis. i-vi, 267 text figures. $3.50 



167. A Review of the Land Mollusks of the Belgian Congo Chiefly Based on 



the American Museum Congo Expedition, 1909-1915. By Henry 

 A. Pilsbrv, 1919, Bulletin, XL, Art. 1, pp. 1-370, Pis. i-xxiii, 

 163 text figures. $4.00 



168. Collembola from the Crocker Land Expedition, 1913-1917. By 



Justus W. Folsom, 1919, Bulletin, XLI, Art. 3, pp. 271-303, Pis. 

 xvi-xxiii. 50c. 



169. Insects of Florida. Va.— Supplementary Notes on The Water 



Beetles. By W. S. Blatchley, 1919, Bulletin, XLI, Art. 4, pp. 

 305-322. 20c. 



170. A Revised List of the Diptera of Jamaica. By C. W. Johnson, 1919, 



XLI, Art. 8, pp. 421-449. 30c. 



171. Report of the Bremidae Collected by the Crocker Land Expedition, 



1913-1917. By Theodore H. Prison, 1919, Bulletin, XLI, Art. 9, 



pp. 451-459, PL XXIV, 2 text figures. 20c. 



172. Mollusca of the Crocker Land Expedition to Northeast Greenland 



and Griunell Land. By Frank CoUins Baker, 1919, Bulletin, XLI, 



Art. 11, pp. 479-517, Pis. xxv-xxvii. 50c. 



173. Fresh Water Mollusca from Colorado and Alberta. By Frank Collins 



Baker, 1919, Bulletin, XLI, Art. 13, pp. 527-539, 4 text figures. 15c. 



174. Polychaetous Annelids from Porto Rico, the Florida Keys, and 



Bermuda. By Ruth A. Hoagland, 1919, Bulletin, XLI, Art. 16, pp. 

 571-591, Pis. xxix-xxxii. 40c. 



175. A New Species of Crab from Japan. By Mary J. Rathbun, 1919, 



Bulletin, XLI, Art. 17, p. 593, PI. xxxiii. 10c. 



176. Bryozoa of the Crocker Land Expedition. By Raymond C. Osbiu-n, 



1919, Bulletin, XLI. Art. 19, pp. 603-624. 20c. 



177. Parasitic Copepods from the Congo Basin. By Charles Branch 



Wilson. 1920, Bulletin, XLIII, Art. 1, pp. 1-8. 25c. 



178. Tipulidse Collected by the American Museum Congo Expedition. 



By Charles P. Alexander, Ph.D. 1920, Bulletin, XLIII, Art. 2, 



pp. 9-23. 25c. 



179. Neuroptera, Panorpata, and Trichoptera Collected by The American 



Museum Congo Expedition, with Lists of the Species Known 

 from the Belgian Congo. By Nathan Banks. 1920, Bulletin, 

 XLIII, Art. 3, pp. 21-33. 15c. 



180. African Stone-flies and May-flies Collected by The American 



Museum Congo Expedition. By James G. Needham, 1920, 

 Bulletin, XLIII, Art. 4, pp. 35-40, PI. v. 15c. 



181. Studies on the Biology of the Aquatic Hvdrophilidse. By E. Avery 



Richmond, 1920, Bulletin, XLII, Art. 1, pp. 1-94, Pis. i-xvi. $1.00 



182. Isopods Collected by the American Museum Congo Expedition. By 



Willard G. Van Name, 1920, Bulletin, XLIII. Art. 5, pp. 41-108, 



126 Text Figures. 75c. 



