1912. ] C. A. Paiva: The Mosquitoes of Calcutta. 97 
Larvae of Stegomyia fasciata, Fab., like S. scutellaris, were 
obtained mostly from earthen pots. ‘These two species generally 
choose small collections of stagnant water to breed in. They will 
never be found to breed in any foul-smelling water, at least this 
is what I have observed. ‘They do not seem to like muddy water 
either. 
S. scutellaris and S. fasciata are the two principal mosquitoes 
which are such a source of annoyance in Calcutta during the day. 
They are purely day feeders and I have never yet caught one in 
a room after it has become dark. 
Larvae of Desvoidea obturbans, Wik., were found in cesspools 
and earthen pots during all the seasons, and during the cold sea- 
son were very plentiful in open drains, which apparently contained 
foul stagnant water. ‘The larvae of this species find cesspools very 
suitable for breeding. ‘They seem to thrive in foul water. 
Larvae of Toxorhynchites immisericors, Wlk., breed chiefly in 
earthen pots and were found in fairly large numbers in such situa- 
tions during the rainy season. During the other two seasons very 
few were obtained. 
Larvae of Myzomyia rossiz, Giles, found open drains most 
suitable during the rainy season, but during the other two seasons 
they were very numerous in tanks as well. 
Larvae of Myzomyia ludlowi, Theob., were most common dur- 
ing the rainy and cold seasons, scarcely any having been got during 
the hot season. Their principal breeding grounds were open drains 
and earthen pots. 
The last two species closely resemble one another. The only 
constant difference between M. ludlowi and M. rossi is that in the 
former the legs are speckled, and it is doubtful, as Theobald 
suggests in vol. v of his ‘‘ Monograph of the Culicidae of the 
World,’’ whether it is really more than a variety. Theobald still 
retains /udlowi in the genus Myzomyia, but Maj. S. P. James, 
I.M.S., now regards it the type of a new genus. 
Table VII indicates the difference between the proportion in 
which the various kinds of breeding places are utilized in different 
localities. This may perhaps be due in some degree to selection 
on the part of the collectors; but I do not think that it can 
be entirely accounted for in this way, in which case a difference in 
the relative abundance of the various kinds of breeding places in 
the different districts is indicated. 
Earthen pots in most cases proved to be the most usual breed- 
ing places. In some cases open drains were found to be equally 
suitable. 
Earthen pots were quite common in districts i, ii, ili, vi, 
viii, ix and x. Larvae of every species found during the survey 
were taken from earthen pots, especially during the rainy 
season, 
District vi gave the largest number of mosquito larvae, then 
came districts i, ii, viii, ix, x, iii, vii, iv and v according to the 
number of larvae found in each district. 
