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The effectiveness of various dosages of different species/strains of nematodes was compared for Galleria mellonella and various pest insects that live in or pupate in soil. Neoaplectana feltiae (= carpocapsae), the only nematode species tested by most other workers, was never the most infective for any of the insect species tested and was least infective for two. All species/strains of nematode were able to kill insects of each species. The degree of infectivity of each of the nematode species/strains for different hosts varied considerably, and no one species/strain of nematode was the most infective for all insect species. This indicates the importance of testing a number of nematode species against any particular insect before commencing field evaluations for biological control.

The descriptions of odonate nymphs from Thailand are presented. The insects of the Order Odonata both naiads and adults may serve as the second intermediate host of some intestinal parasites in Thailand.

The occurrence of micronemes and paraglycogen in the cytoplasm of Spiriopsis adipophila (Arvy and Delage 1966) Arvy and Peters 1972, incites us to consider this parasite of Ephemeroptera larvae as the infesting stage of a Sporozoon. It could be in fact a new member of the Barrouxiidae, a family of Coccidia parasitic in Insects and Centipedes which are characterized by the production of monozoic spores.