554 
DIPTERA. 
anterior and a posterior branch, the anterior branch having an offshoot 
(coming off nearer the edge of the wing) connected with the posterior 
branch by a small cross-vein (the posterior cross-vein ), and thus com¬ 
pletely enclosing a small space in the middle of the wing. This enclosed 
area is called the Discal cell. Looking again at the basal half of the 
wing, we see behind the Media a vein called the Cubitus, dividing, like 
the Media , into two branches, of which the front one is joined by a little 
cross-vein to the posterior branch of the Media. The other (posterior) 
branch of the Cubitus coalesces, before it reaches the edge of the wing, 
with the anal, the sixth and last longitudinal vein. 
In speaking of the spaces bounded by veins, i.e., the cells, we use the 
following names. The cell between the costa and subcosta is the Costal 
cell, that between the subcosta and radius, the subcostal. Separating 
the main stem of the radius from that of the media is the first basal 
(bounded on the outermost side by the anterior cross-vein), while the 
second basal similarly separates the media from the cubitus. The cell 
between the cubitus 2 and anal vein is the anal cell, which in this case is 
closed before the margin of the wing is reached owing to the coalescence 
of the cubitus 2 and anal veins. The cell behind the anal vein is the 
axillary. 
Taking now the cells bordering on the outer edge of the wing, the 
one lying next to the subcostal cell on its outer side is the marginal cell 
Fig. 352— Anopheles wing, after nuttall and shipley. 
THE VEINS MEDIA 1 AND MEDIA 2. 
The crosses indicate 
(between the first two branches of the radius). Next behind it is the 
ls£ submarginal, and behind this and including the point of the wing is 
the 2nd submarginal. Along the edge of the wing, filling up the space 
between the 2nd submarginal cell and the coalesced cubitus 2 anal vein, 
