General Notes. 3 
The Anopheles sent by Dr. Theiler were mainly P. cinereus 
(Theobald) and P. Pretoriensis (Theobald), and a few N. maculi- 
palpis (Giles) and M. Mauritianus (Grandpré). - 
The so-called “brown Anopheles” of Dr. Theiler was cinereus, 
the “black Anopheles,” Pretoriensis. For relative date of 
appearance of species, vide pages 78 and 99. 
THE PAIRING OF MOSQUITOES. 
Observations have now been made on the pairing of several 
mosquitoes. Dr. Low sends me the following notes on Stegomyia 
fasciata and Culex fatigans :— 
“8. fasciata.—As soon as the insects emerge from the pupae, 
even on the first day, they begin to breed ; the males flying after 
and chasing the females till they catch them, and then fly about 
joined together. This takes place in this genus by day and by 
night, and I have watched a male copulate with the same female 
several times. After they part from each other, the male pursues 
another female, until it may have fertilised many in a day. In 
one cage, in which there were fifteen old females, I one day intro- 
duced two young males. They immediately proceeded to breed, 
and went on doing so for hours. I did not actually determine 
the time spent in copula, but it was always short, a minute or 
less, and not like the prolonged act of the Dragon-flies.” 
“ C. fatigans.—In this species both males and females sleep by 
day, but it is a quite common sight to see them pairing at night.” 
NOTE ON MALARIA AND MOSQUITOES OF THE 
WABASH VALLEY, CASS COUNTY, INDIANA, U.S.A. 
The following note was sent by Dr. Robert Hessler, A.M., 
M.D. :— 
The lowlands along the Wabash River in this part of Indiana 
were in former years notorious on account of the prevalence of 
malaria; but at the present time cases of malarial infection 
are seldom seen, and, moreover, usually yield promptly to medi- 
cinal treatment. Presumably this is due to the fact that rein- 
fection is rare at present, and because quinine is given in liberal 
doses. The rarity of malaria at present is ascribed to the 
extensive drainage that has been made ; pools of stagnant water 
are seldom seen, and the-river itself has sufficient current. to 
render the water unfavourable for the development of the mosquito 
B 2 
