Two geographic founder colonies of Cotesia flavipes from Pakistan were imported for biological control of Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae) and other African cereal stem borers. Separate colonies were initiated from the two importations and examined for electrophoretic variation at 14 isozyme loci over 22 generations of laboratory rearing. Two out of 14 loci examined were found to be polymorphic. In the first12 generations of sampling, when approximately 1000 breeding females were used to perpetuate both colonies, there was a slight increase in heterozygosity at the MDH locus in the colonies of the two strains. In the last 10 generations of sampling, when only SOD females were used, there was a rapid decrease in electrophoretic variation in the two colonies. The effective population sizes for the two colonies was estimated at 3.4 and 9.0 % of the number of breeding females used to continue the colonies. These data indicate that using 1000 mated females to perpetuate the C. f1avipes colonies maintained greater genetic variation than using 500 females.
Palparellus Navas is reinstated as a valid genus and is revised. Twelve species comprise the genus, eight from southern Africa, two from central Africa and one each from Madagascar and India. A key to the species is provided and all are redescriptionbed. One new species, P. ulrike,is descriptionbed from southern Africa. The following species are synonymized: Palparellus mistus Navas and P. excelsus Navas with P. nyassanus (Navas); P. roratus Navas with P. festivus (Gerstaecker); Palpares formosus bifasciatus Stitz with P. dubiosus (Peringuey); P. ruspolii Navas with P. rothschildi (Van der Weele); P. dubiosus Navas with P. astutus (Walker). Palpares virgineus Stitz is a nomen nudum. A checklist of valid species and synonyms is provided. Larvae are unknown.
Miteronotus gen. n. containing four new species, M. labeosus, M. bucculentus, M. viginti and M. knysnaensis, is descriptionbed and illustrated. The species are descriptionbed, illustrated and compared and their chromosome numbers are given. A key to the species is provided.