158 
A Monograph of Culicidae: 
whereas the relative position of the posterior cross-vein in 
that species varies to a slight extent even in the two wings 
of one specimen. 
Neither the venation nor the number of mid scutellar 
chaetae can then be taken into account in dealing with this 
group of Culex. 
St. Vineent ( $ ). Mombasa ( $). 
St. Lucia ( ? ). 
Adelaide (?). 
Para ( ? ). 
Madras (?). Durban (<$). 
Fig. 238. 
Wings of Culex fatigans and ?). (X. 9.) 
(Showing variation in the fork-cells and their stems.) 
Another point of considerable variation is to be found in the 
first abdominal segment. Specimens from Madras, Singapore, 
Queensland, Mombasa, &c., have two patches of dusky scales on 
the first segment; specimens from Calcutta, Hong Kong, Pun¬ 
jab, Singapore, Queensland, Adelaide, Pemba, &c., have white 
scales on this segment; some of those from Bermuda, Durban, 
