Genus Culex. 
157 
Demerara 
. 9 8 mid scutellar bristles. 
33 
• S ^ 3, ,, ,, 
Para 
* 9 ' 33 33 33 
33 
• S ^ 33 ,, ,, 
Bermuda 
• 9 6 „ „ „ 
33 
• S 7 33 33 33 
Gibraltar 
9 8 33 33 33 
>> 
• S ^ ,, ,, 33 
Durban . 
9 8 
' 4-^99 9 9 9 9 
• $ ^ 33 3 3 3 3 
Pemba Island . 
•97„ 
33 
• $ 8 33 33 33 
Madras . 
•96„ 
33 
• ^ ^ 33 ,, ,, 
Singapore 
$ and 9 7,, „ „ 
Fou Chow 
$ and 9 6 33 3, 33 
Bengal . 
9 9,, ,, 33 
Queensland 
9 7 large, 1 small mid scutellar 
bristles. 
33 
$ 7 large, 1 small mid scutellar 
bristles. 
Such variations 
characters valueless. 
rendered these usually constant specific 
With regard to 
venation, it may be roughly said that the 
stem of the first sub-marginal cell is never less than one-fourth 
the length of the cell. Varieties in the length of the stem vary, 
however, as follows, 
in the 9 : —* 
Singapore 
. cell 2| times length of stem. 
St. Lucia 
• cell 3^ ,, ,, 
St. Vincent . cell 2J ,, ,, ,, 
Adelaide 
. cell 3 ,, ,, ,, 
Durban . 
. cell 4 ,, ,, ,, 
Every gradation in between the 21 and 4 limits could be found, 
whilst specimens from the same locality vary also. It will be 
noticed I have made use of the relative length of the veins in some 
species. In certain species certain veins are constant; for 
instance, in Culex jpipiens the relative length of the stem of 
the sub-marginal cell has been found to scarcely vary at all. 
This I take to be a fixed character, and thus of specific value, 
