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near the bottom, often in a depth of one third of a meter (figs. 
1—2). Really, the respiration takes place in quite the same man- 
ner as in the case of the Donaciin larvæ, the life of which has 
 — 
Fig. 2. Larva in its normal position, attached to a root. 
been studied so admirably by my good friend Dr. Ad. Bøving upon 
almost the very same locality, where the Mansonia-larva was found. 
Hitherto the Mansonia-larvæ have only been found in Amer- 
ica, and as I knew that the genus Mansonia has an almost entirely 
