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On some larval stages of two species of Ichneumonidae, Bassus tetragonus Thunb. and Homocidus fissorius Grav., parasitizing Sphaerophoria flavicauda Zett. (Diptera, Syrphidae)
Published online by Cambridge University Press: 06 April 2009
Extract
During a study of syrphid larvae I met with several instances of their being parasitized by hymenopterous larvae. The species of syrphid larvae most commonly parasitized, in my material, was Sphaerophoria flavicauda. From the puparia of this species I obtained two species of ichneumonids, which Mr J. F. Perkins, of the Natural History Museum, London, very kindly identified for me as Bassus tetragonus Thunb. and Homocidus fissorius Grav. Out of seven puparia of Sphaerophoria flavicauda, one adult of Homocidus fissorius and six of Bassus tetragonus were obtained. This paper therefore deals mainly with the larvae of the latter species.
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