THE MOSQUITOES OF THE SOUTHEASTERN STATES 7 
A 
Q 
yondd ost 
/ / 
C ie 
Figure 23.—Types of air tubes: A, Psorophora ferox (also showing terminal 
segments of abdomen); B, Mansonia perturbans; C. Culiseta inornata. 
7. Head normal, without lateral pouches; anal gills four; air tubes short 
and stout in most species____ Sd tot Tee ey ee amet ACW CS aS 
DEINOCERITES 
Head with a prominent triangular pouch on each side (fig. 25, B); 
only two, very short, anal gills; air tube about 4:1. [Lower head 
hairs Single or double, much longer than upper head hairs; comb of 
eighth segment of many scales in a patch; tuft of air tube usually 
double or triple; anal segment with divided dorsal and ventral 
sclerotic plates.] Breeds in crab holes along coast of southern Flor- 
ldap e PONESSPCClES= =2 es Se fies ee sae 4 CONCET 
8. Eighth abdominal segment with comb scales: mouth brushes ciliform__-__ 9 
MEGARHINUS 
Highth abdominal segment without comb scales but with a lateral plate 
bearing two stout spinulose hairs on posterior margin; mouth brushes 
consisting of about 10 stout, closely appressed, prehensile, curved rods 
(fig. 25, C). [Air tube short, a single pair of ventral tufts near base; 
anal segment ringed by plate; anal gills very short.] Very large pre- 
dacious larvae, occurring in tree holes. The two United States species 
aneaseparated on male characters 222 == 2 M. septentrionalis 
M. rutilus 
