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Breeding seasons and annual cycles of Trinidad land-birds
Vol 49, Iss 1, Page 1
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The effect of thermal acclimation on brain cholinesterase activity of the killifish, Fundulus heteroclitus
Vol 49, Iss 2, Page 41
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Notes on a collection of bats from Central America, with the third record for Cyttarops alecto Thomas
Vol 49, Iss 3, Page 53
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Control of the snake mite, Ophionyssus natricis (Gervais), in captive reptile collections
Vol 49, Iss 4, Page 65
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Behavior of the Amazon dolphin, Inia geoffrensis (Blainville), in captivity
Vol 49, Iss 5, Page 81
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The development of curiosity within the genus Panthera
Vol 49, Iss 6, Page 109
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Manatees in the Guianas
Vol 49, Iss 7, Page 115
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Self-contained diving operations in McMurdo Sound, Antarctica: Observations of the sub-ice environment of the Weddell seal, Leptonychotes weddelli (Lesson)
Vol 49, Iss 8, Page 121
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Birds, butterflies, and plant poisons: A study in ecological chemistry
Vol 49, Iss 9, Page 137
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Protective display and sound production in some New World arctiid and ctenuchid moths
Vol 49, Iss 10, Page 161
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Observations on the habits of the proboscis monkey, Nasalis larvatus (Wurmb), made in the Brunei Bay area, Borneo
Vol 49, Iss 11, Page 183
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Gonadal hydration of carp (Cyprinus carpio) and goldfish (Carassius auratus) after injections of pituitary extracts
Vol 49, Iss 12, Page 193
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Experimental hybridization of the green treefrog Hyla cinerea Schneider (Hylidae)
Vol 49, Iss 13, Page 211
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Studies on the pituitary gland of Xiphophorus maculatus (the Platyfish)
Vol 49, Iss 14, Page 217
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The geographical distribution of the color-pattern components of Heloconius erato and Heliconius melpomene with genetical evidence for the systematic relationship between the two species
Vol 49, Iss 15, Page 245