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Supplementary Note on the Formation of a Cocoon by Cyclorhaphous Dipterous Larvae

Published online by Cambridge University Press:  06 April 2009

D. Keilin
D. Keilin
Affiliation:
(From the Quick Laboratory, University of Cambridge.)
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Extract

The formation of a cocoon or of a more or less solid case by a larva before its transformation into a pupa, occurs very seldom in cyclorhaphous Diptera. This is due undoubtedly to the existence in all these Diptera of a puparium formed by the contracted and hardened last larval skin, in which, as in a cocoon, is contained and hardened last larval skin, in which, as in a cocoon, is contained the real pupa or chrysalis of the fly.

Type
Research Article
Information
Parasitology , Volume 11 , Issue 2 , February 1919 , pp. 237 - 238
Copyright
Copyright © Cambridge University Press 1919

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References

1 Parasitology, IX. 325–450 (1917).Google Scholar

2 Dufour (1840). “Second mémoire sur les métamorphoses de plusieurs larves fongivores appartenant à des Diptères.” Ann. de Sc. Nat. 2e série, XIII. 148–163, Pl III. On page 157 of this paper we read as follows:Google Scholar

“ Au moment de leur transformation en pupe, ces larves m'ont fourni un fait assez singulier. Dans le bocal où je les élevais, j'avais laissé du papier qui, incessamment humecté par la décomposition du champignon, se reduisit en pâte. Je trouvais plusieurs pupes enveloppées d'une espèce de cocon ou de fourreau formé avec cette pâte; mais toujours le bout antérieur, celui par lequel dévait avoir lieu l'éclosion, était découvert. D'autres pupes étaient nues au milieu du magma ou dans le sable qui garnissait le fond du vase.”