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The egg-parasite of Sialis lutaria: a study of the influence of the host upon a dimorphic parasite

Published online by Cambridge University Press:  06 April 2009

George Salt
George Salt
Affiliation:
From the Zoological Laboratory, Cambridge
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Extract

1. Nearly a quarter of a million eggs of Sialis lutaria were collected at Cambridge in 1936. About 0·6 per cent of them were attacked by a parasite.

2. The egg-parasite of Sialis is distinct from Trichogramma evanescens, and is to be called T. semblidis (Aurivillius).

3. The male of Trichogramma semblidis occurs in two forms. Neither consists merely of imperfect or degenerate individuals of the other, for the two forms are equally large and differ constantly and fundamentally in several characters. The species, therefore, exhibits true dimorphism.

4. Rearing experiments involving isolated pure lines show that it is principally the host that determines which form of the parasite shall emerge. Males reared on Sialis are of the apterous form; those reared on three species of Lepidoptera are of the winged form.

5. The dimorphism of T. semblidis is discussed in relation to other examples of dimorphism in the Hymenoptera. It is shown to have several features of special interest.

Type
Research Article
Information
Parasitology , Volume 29 , Issue 4 , October 1937 , pp. 539 - 553
Copyright
Copyright © Cambridge University Press 1937

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