2 A Monograph of Culicidae. 
September and October, again in a privy and also in a bed- 
room. 
Avucust. Between In privy. In bedroom. 
12th .. 8&10a.m. .. Culex 4; Anopheles 6 Culex 2; Anopheles 5 
13th .. - .. Culex1; Anopheles 8 Culex 1; Anopheles 6 
AAG Be . .- Culex 7; Anopheles 15 Culex 1; Anopheles 3 
POLE is os .. Culex 3; Anopheles 3 Culex 5; Anopheles 12 
6th, «. 5 . Culex 7; Anopheles 12 Culex 8; Anopheles 12 
7th -. ‘5 .. Culex 9; Anopheles 8 .. Culex 2; Anopheles 9 
18th .. . Culex1; Anopheles 4 .. Culex 3; Anopheles 4 
SEPTEMBER. In privy. : In bedroom. 
3rd .. Culex 12; Anopheles 3 Culex 4; Anopheles 6 
4th-... Culex14; Anopheles 7 Culex 7; Anopheles 8 
5th Culex 20; Anopheles 14 Culex 2; Anopheles 2 
6th Culex 8; Anopheles 20 Culex 3; Anopheles 4 
7th Culex 15; Anopheles 6 Culex 4; Anopheles 1 
8th Culex 3; Anopheles 5 Culex 2; Anopheles 1 
9th Culex 9; Anopheles 4 Culex 1; Anopheles 0 
OCTOBER. In privy. In bedroom. 
5th Culex 20; Anopheles 4 Culex 12; Anopheles 2 
6th Culex 17; Anopheles 3 Culex 0; Anopheles 1 
7th Culex 30; Anopheles 2 Culex 4; Anopheles 4 
8th Culex 12; Anopheles 4 Culex 0; Anopheles 6 
9th Culex 5; Anopheles 9 Culex 12; Anopheles 0 
10th Culex 8; Anopheles 8 Culex 3; Anopheles 0 
lith Culex 10; Anopheles 0 Culex 1; Anopheles 2 
It will thus be seen that in some districts Anopheles are more 
abundant at certain times than Culex in this country. In 
other places Anopheles do not occur indoors at all, the genus 
being represented by A. bifurcatus, which I have not found far 
from woods. In most warm climates, however, Culicinae largely 
preponderate. ; 
A series of careful observations on this subject have been 
made by Dr. Theiler at Pretoria, which are tabulated in the 
appended chart, which shows the frequency of Culex and 
Anopheles on the river at Pretoria. 
‘‘The larvae were collected three times a week and then left 
alone for hatching. Every day the numbers were counted ; the 
chart shows, therefore, the relative value, and is made up with 
the intention to compare in which proportion Anopheles and 
Culex may be found. The Anopheles were only found in the 
river in certain spots, usually in small pools of water alongside 
the river bed, into which run some small springs. The best 
breeding place was behind a rock, which protected the pool 
underneath from -the afternoon sun. The Culex were collected 
out of pools in no-connection with the river and in tubs.” 
