Abstract
In this study both spatial and seasonal variations in the size of tsetse flies from the south Kenya coast were investigated. The work was done at two sites; in Rongomwagandi (in Shimba Hills National Researve) and in Muhaka Forest. Wing length was used as an index of fly size. In a cross-sectional study the size of flies from two study sites was compared. Significant differences were found between the size of flies from Rongomwagandi and Muhaka Forest. In a longitudial study the size of flies from two study sites was compared over a six month period. The population of flies at Rongomwagandi showed larger seasonal variation in size than those in Muhaka. Additionally, all flies collected were aged using the wing fray method. More older flies were observed in dry season than in rainy season.
