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Titis, new world monkeys of the genus Callicebus (Cebidae, Platyrrhini): a preliminary taxonomic review

Published in Fieldiana Zoology, in 1990, in volume 55, pages 1-109

Variability and significance of parietal and ventral scales in marine snakes of the genus Lapemis (Serpentes: Hydrophiidae), with comments on the occurrence of spiny scales in the genus

Published in Fieldiana Zoology, in 1990, in volume 56, pages 1-13

Mice of the Akodon boliviensis size class (Sigmodontinae, Cricetidae), with the description of two new species from Brazil

Published in Fieldiana: Zoology, in 1990, in volume 57, pages 1-35

Report on a collection of amphibians and reptiles from Sichuan, China

Published in Fieldiana. Zoology. New Series, in 1990, in volume 58, pages 1-24

The Birds of Mt. Isarog National Park, Southern Luzon, Philippines, with Particular Reference to Altitudinal Distribution

Published in Fieldiana Zoology, in 1990, in volume 60, pages 1-39

Hoplomyzon sexpapilostoma, a new species of Venezuelan catfish (Pisces: Aspredinidae), with comments on the Hoplomyzontini

Published in Fieldiana, Zoology (New Series), in 1990, in volume 61, pages 1-9

Feather mites of the Aralichus canestrinii (Trouessart) complex (Acarina, Pterolichidae) from New World parrots (Psittacidae). 2. From the genera Aratinga Spix, Deroptyus Wagler, Leptosittaca Berlepsch and Stolzmann, Ognorhynchus Bonaparte, Pionites Heine, and Pyrrhura Bonaparte, and conclusions to the study

Published in Fieldiana Zoology, in 1990, in volume 62, pages 1-30