On the Anatomy and Physiology of the Air-Sacs 
of the Larva of Corethra i)lnmicornis. 
By 
K. S. Bardenfleth and R. Ege. 
(From tlie I.aboratories of Biological fresh watei' research at Hillerbd 
and of Zoophysiology at the University of Copenhagen.) 
I. 
Form and Structiire. 
By mag. sc. K. S. Bardenfleth. 
Since the first descriptions of the larva of Corethra^) by Réau- 
mur and Ly on et the attention of the naturalists has been attrac- 
ted by the peculiar “phantom-like“ appearence (Miall) of the totally 
transparent animal — so unlike the larvæ of the other Culicidæ —, 
by its life-habits and no less by the curious air-sacs in its body. And 
') The name Corethra Meigen is in more recent works frequently substi¬ 
tuted by Sayomyia Coq., Corethra Meigen in its turn becoming a substi- 
tute for Mochlonyx Loew. The type species of Corethra Meigen is 
Tipula culiciformis of de Geer; but this species being later on referred 
to the genus Mochlonyx of Loew, the genus-name Corethra Meigen 
ought, according to the strictest maintaining of certain paragraphs in the 
international rules of nomenclature, to follow its type species, and a new 
or a still earlier name ought to be given to the remaining ci-devant 
Corethra-spec'iQS’^ and consequently Coquillet has formed the new name 
Sayomyia. But setting aside that those names of hybrid nature (in a phi'o- 
logical respect) rather were to be avoided, and in this case easily can 
be avoided, as Lichtenstein as early as 1800 has given the name Chao- 
borus to the larva — nevertheless I think it undesirable to change an 
old and well known name of a common animal, and still more incon 
venient to exchange one well known name (in this case Mochlonyx) for 
another name formerly used in a different sense. (Cfr. A. Handlirsch in 
Chr. Schroder: Handb. d. Entomologie, Bd. Il, 1914.) In this paper, there- 
fore, Corethra will be used in its old signification, including the species 
plumicornis and its allies. 
