The parasitoid wasp, Eretmocerus delhiensis (Hymenoptera, Aphelinidae) is a thelytokous and syn-ovigenic parasitoid. To evaluate E. delhiensis as a biocontrol agent in greenhouse, the killing efficiency of this parasitoid by parasitism and host-feeding, were studied. Killing efficiency can be compared by estimation of functional response parameters. Laboratory experiments were performed in cont...

Intraguild predation (IGP) takes place when natural enemies that use similar resources attack each other. The impact of IGP on biological control can be significant if the survival of natural enemy species is disrupted. In the present study, we assessed whether Geocoris punctipes (Hemiptera: Lygaeidae) engages in IGP on Eretmocerus eremicus (Hymenoptera: Aphelinidae) while developing on whitefl...

[This paper, delivered at the Colloquium on Symbolism in Paris in June 1964, appeared in the Cahiers internationaux de symbolisme 6, Brussels 1964, pp. 3-26. The version printed here has been condensed (with the permission of the author) by omitting paragraphs of a technical nature on pages 5 and 8 of the original, as well as an account (pp. 17-23) of the topography of the Eighth Clime. The com...