i, 
12. 
13. 
14. 
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16. 
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18. 
19: 
20. 
21. 
22. 
23. 
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27. 
28. 
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30. 
3l. 
NA MEAN 
ROBERTO S. BREED.—The Changes which occur in the muse- 
les of a Beetle, Thymalus, marginicollis Chevr., during 
metamorphosis. — Cambridge, 1903. 
OscaR HERTwWIG—The Growth of Biology in the nineteenth 
century.— Washington, 1901. 
Kart Branpt.—Life in the Ocean.— Washington, 1901. 
A. RADCLYFFE DuGMorE.—Nature Pictures.—Washington, 
1901. 
Ip.—The Outtaw; a character study of a beaver who was 
cast out by his companions.— Washington, 1901. 
HENRY DE VARIGNY.—The Breeding of the artic fox. — 
Washington, 1901. 
GEORGE M. STERNBERG.—Transmission of yellow fever by 
Mosquitoes.— Washington, 1901. 
CHARLES A. WHITE.—The Mutation theory of Professor De 
Vries.— Washington, 1902. 
Ernest THOMPSON SETON.—The national zoo at Washington, 
a study of its animals in relations to their natural envi- 
ronment.— Washington, 1902. 
F, A. Lucas.—The Dinosaurus or terrible Lizards.—Was- 
hington, 1902. 
Harry H. Jounston.—The Okapi. __Washineton 1902. 
F. G. AFLALO.—Some Private Zoos.— Washington, 1902. 
THE WANDERINGS OF THE WATER BurraLo.—Washington, 
1902. 
J. 8. TAVARES.—Description de deux Cécidomyies nouvelles. 
—Marsella, 1902. 
Ip.—Bewegungen der Galle des Kafers Nanophyes pallidus 
Oliv.—Leipzig, 1903. 
HARRY BERKELEY JAMES.—A new list of Chilian Birds.— 
London, 1902. 
Dr. FEDERICO VILLARREAL.—Resúmen de las publicaciones 
desde 1885 hasta Agosto de 1899. 
FERNAND MEUNIER.—Nuevas contribuciones a la fauna de 
los himenópteros fósiles. —Barcelona, 1903. 
ARTURO BorILL 1 Poch, Dr. JAIME ALMERA.—Consideracio- 
nes sobre los restos fósiles cuaternarios de la caverna de 
Gracia. (Barcelona). —Barcelona, 1903. 
RAFAEL Pura y VALLs.—Problema de a Pirenáica. 
Barcelona, 1903. 
FERNANDO LAHILLE.—Nota sobre un jénero nuevo de Escóm- 
brido,—Buenos Aires, 1903. 
Obsequiados todos por los autores. 
