286 
HM. DK (1915 p: 506) state as follows: "Second marginal 
and second posterior cells much longer than their petioles, the 
petiole of the second marginal about half as long as the cell, cross- 
veins short, basal cross-vein more than its own length distant from 
anterior cross-vein." 
In all other respects the Danish specimens are highly in dis- 
accordance with the description of M. perturbans. I therefore refer, 
though with some doubt, the Danish specimens to M. Ricardii Fi- 
calbi. As mentioned above, the only locality in this country where 
the species has been found up to now, is the Donse-ponds be- 
tween Hørsholm and Hillerød, North-Seeland. 
Among all the Danish Culicidæ M. Ricardii will immediately 
attract the attention on account of its size; only C. annulatus, 
annulipes, and canlans reach a similar size; the first of these 
three species is distinguishable owing to the spotted wings, and 
the two others have very conspicuous bands on the legs. M. Ri- 
cardii has unspotted wings and as far as I know the bands on 
the legs are not so conspicuous; it differs at the first glance from 
the other Danish Culicidæ in having an apparently very coarsé 
nervature in the wings; this is due to the scale cover being 
much coarser than in our Culeæx-species. 
Description of Larva. 
Goeldi (1902 p. 23) gave the first description of a Mansonia- 
larva (M. fasciolatus from the tropical America); he hatched the 
eggs but could not keep the larva living; his rather deficient draw- 
ing shows the remarkable sipho. It was reproduced by Theobald 
(vol. IV p. 484). Up to that time (1907) we had no idea with regard 
to the life of the larva. First then the very peculiar biology of 
the larva and the pupa was cleared out through the investigations 
of Currie & Brakeley, Smith (1908) and Dyar & Knab 
(1910). Later, through the studies of Moore (1910) (see H. D. K. 
1915 p. 519), we became acquainted with the biology of M. titil- 
lans Blanchard from South-America. It has now been demon” 
strated, that both species in the larval stage bore the sipho into 
submersed plants and fetch the air from the airchambers of these. 
Still we feel the wants of a more thorough examination of the 
