370 Bulletin de la Société Boy ale Entomologique d'Egypte 
of the eighth segment with 11-12 teeth ...... 
... Anopheles sergènti, Theo. 
Head mainly yellow. Metathoracic float hair with 
about six leaflets. Comb of the eighth segment 
with about 1 5 teeth .. 
. Anopheles rhodesiensis, Theo. 
6. Siphon with one pair of ventral tufts. 7 
Siphon with several ventral tufts. (Culex) .. ii 
7. Tuft at the base of the siphon . 
. Theobaldia Iongiar colata , Macq. 
Tuft near or beyond the middle of the siphon 8 
8. Eighth segment with a large chitinous plate 
hearing a comb of about eight spines. 
.. Uranotaenia unguiculata, Edw. 
Eighth segment without such plate ... 9 
9. Comb of the eighth segment a single row of 
large teeth Aedes (. Stegomyia ) argenteus, Poi ret. 
Comb of the eighth segment a patch of numerous 
small scales. . 10 
10. Siphonal tuft distinctly beyond the middle of the 
siphon. Anal gills about one third as long as 
the saddle .. Aedes ( Ochlerotatus ) caspius , Pall. 
Siphonal tuft at the middle; anal gills very small, 
circular .... Aedes (Ochier otatus) detritus , Hal. 
11. Siphonal tufts in a single, sometimes slightly 
zigzag, mid-ventral row . 12 
Siphonal tufts more or less paired, and in two 
sub-ventral rows . i4 
12. Siphon less than four and a half times as long 
as broad, with not more than ten tufts. Post- 
antennal tufts all conspicuous . i3 
