INTRODUCTION A summary of the results of earlier workers has already been given by Seaton & Lumsden (1941), of whose work the present is a further extension. In that paper were reported investigations to determine the effects of age, fertilization and light on the avidity for a blood meal of female Aedes aegypti (L.). There remained to be worked out the effects of variations in temperature and ...

Most hypogean environments particularly caves, are characterized by a stable temperature, usually in the range of 10±15 ± C, and high relative humidity. These ecosystems, when an allochthonous input of organic matter is present, seem to favor the growth of heterotrophic bacteria, from which actinomycetes predominate. Streptomyces species are particularly abundant and, in some cases, can be foun...