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Hematological values and diameters of erythrocytes are reported for bats from Colombia, Puerto Rico, and St. Croix. A marked variation was observed in most of the blood characters considered. Smaller bodied species had lower leucocyte counts than larger ones, as did non-gravid females and adult males when compared with pregnant and lactating females. Erythrocyte counts of frugivorous species were lower than those reported for insectivorous bats. Mean erythrocyte diameters were similar and had comparable ranges of variation. There were no significant differences between lactating, gravid, or non-gravid females in hemoglobin concentration, hematocrits, differential counts, or diameter of erythrocytes. Certain abnormalities in the blood picture were observed, and data are discussed in comparison with those obtained by others.

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Notre Dame is collaborating with JSTOR to digitize, preserve and extend access to American Midland Naturalist. ABSTRACT:Reproductive activity of males of the tropical frugivorous bat, Artibeus lituratus, was investigated in west central Colombia for a 17-month period during 1961-1963. The climate of the area varied little throughout the study period, and climatic conditions did not influence reproductive activity in males. Data based on presence of sperm, length and tubule diameter of the testis and diameter of the epididymis indicate that males are capable of reproductive activity at any time of the year, and the reproductive pattern is acyclic without suggestions of seasonal variations.

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