18 
A Monograph of Culicidae. 
usually large, but smaller in Megarhinus ; the sub-costal trans¬ 
verse is always present but not always readily seen, whilst the 
second long vein is united to the first by the marginal trans¬ 
verse (x) ; there are one ( Culex) or two ( Megarhinus ) indistinct 
incrassations of the wing membrane («') representing branches 
of the fourth trunk, which never reach the margin of the wing 
and are never provided with scales ; in the £ ’s the fork-cells 
are usually much smaller than in the 9’ s (especially in Culex and 
Anopheles); the wings are recumbent in repose, and may or may - 
not be longer than the abdomen. 
C. S.C. 1* i* 
c., costal vein; s.c., sub-costal ; 1st to 6th, first to sixth longitudinal veins; a, a', and 
a", incrassations (a' called by Austen the 6th vein, a" the Sth) ; y., supernumerary 
cross-vein; z., mid cross-vein; p., posterior cross-vein; A., costal cell; B., sub¬ 
costal cell; C., marginal cell; D., first sub-marginal cell; E., second sub-marginal 
cell; E., first posterior cell; G., second posterior cell ; J., third posterior cell; K., 
anal cell; H., first basal cell; I., second basal cell; L., auxiliary; M., spurious cell. 
In a pamphlet issued by the Museum, “ How to Collect 
Mosquitoes,” the wing venation of Culex is given as follows : 
the sub-costal is called the mediastinal, the second long vein is 
described and figured as issuing from the first, the third long 
vein as issuing from the second; the incrassation along the fifth 
is given as the sixth vein, the true sixth long vein is called the 
seventh, and an eighth long vein is shown where a fold sometimes 
occurs. The supernumerary cross-vein is taken to be part of the 
third long vein, and the middle transverse vein is called the 
anterior transverse. 
The sixth and eighth veins in this nomenclature are really 
