sera of certain phyUostomatid bats. Syst. Zool.,.-Densitometric, micro-Ouchterlony immunodiffusion tests and turbidimetric precipitin tests were used to study relationships among species of bats in the family Phyllostomatidae. The immunodiffusion data were analyzed using two multivariate statistical programs in a GE 625 computer. The turbidimetric data were analyzed empirically. A distance dendrogram and a computer-drawn three-dimensional stereogram were derived. Immunologically the sturnirinines and the stenodermines are closely related as are the carollines and glossophagines. The immunologic distinctness of Choeronycteris from Glossophaga and the affinity of the former to species of the Phyllostomatinae suggest that the Glossophaginae are of polyphyletic origin. Desmodus (Desmodontidae) may possibly be a subfamily in the Phyllostomatidae. The Chilonycterinae may rank as a separate family.

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The stage of development and age were found to effect the responsiveness of dog T-lymphocytes to phytohemagglutinin. T-lymphocytes from beagles 0 to 4 weeks of age showed significantly less response to phytohemagglutinin ( P < 0.001) than T-lymphocytes from these same dogs at 6 to 12 weeks of age. Peak response to phytohemagglutinin occurred between 6 weeks to 6 months of age, after which there was a significant correlation ( P < 0.02) between increase in age and decrease in phytohemagglutinin responsiveness.

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