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impossible to use characters which may be available for a more suitable arrangement. Any specimens representing genera improperly placed, or not common, would be most greatly valued by the author.Finally I wish to express my unbounded admiration for the late Samuel Wendell Williston. To him I owe, as do very many others, an everlasting gratitude for his kindly encouragement, while he lived, and real inspiration from his printed works. I know of no Dipterologist who has so clearly set forth the facts or who has been so great an inspiration to others. And as a slight token of my appreciation I respectfully dedicate this book to his memory.

Previous studies have demonstrated that a strong power motive in college students as assessed by the TAT (« Power), if inhibited and/or stressed, is associated with impaired immune-function reports of more serious illnesses. Subjects in this study were 133 male prisoners varying widely in age, ethnicity, and educational background. Motives were assessed from the TAT, stress and illness from self-report inventories, and immune function from concentrations of immunoglobulin A in saliva (S-IgA). Those high in n Power and in reported stress showed the highest levels of reported illness and the lowest concentrations of S-IgA, significantly different from those high in n Power and low in stress, or from all other subjects, but not from those simply high in stress. Although the stress-illness association may be due to a response bias to complain about everything, the motive/stress and lowered immune-function connection cannot be attributed to response bias. Among prisoners the effect of motive type is less and the effect of stress is greater than, among college students perhaps because stress in prison is stronger. As expected, high concentrations of S-IgA were associated with reports, of fewer upper respiratory infections supporting the hypothesis that some motive/stress and illness connections may be mediated by impaired immune-functions.