10 
PACIFIC SCIENCE, Vol. Ill, January, 1949 
4. Seta 2 the most conspicuous seta on seg- 
ment II, usually about twice as long as 
seta B; upper postocular seta ( 1 ) of 
cephalothorax two- or three-branched 
...Tripteroides ( Mimeteomyia ) p. 23. 
Seta 2 smaller, or equal to, B which is the 
most conspicuous seta on segment II; 
upper postocular seta ( 1 ) of cephalo- 
thorax simple, not branched 
— Tripteroides (Rachisoura) p. 23. 
5. Anal segment (X) with a pair of setae; 
paddles broad, lateral face longer than 
medial face, with hair-like fringe and 
without terminal setae 
..Megarhinus p. 23. 
Anal segment (X) without setae; pad- 
dles with lateral and medial faces ap- 
proximately equal in length, if fringed 
with hairs then they also have termi- 
nal setae . 6 
6. Setae A-III-VI stout, peg-like ( apex 
pointed or rounded), always on pos- 
terior margin at or near to postero- 
lateral corner of segments 7 
Setae A-III-VI small, simple spines on 
lateral margin above postero-lateral 
corners of the segments 8 
7. Float-hair on segment I dendritic; pad- 
dles with both terminal and accessory 
setae Anopheles p. 11. 
Bironella p. 21. 
Float-hair on segment I with eight to 
ten short simple branches; paddles 
with only the simple terminal seta 
..Aedomyia p. 38. 
8. Trumpets divided to base into two mov- 
able leaflets, no meatus 
Hodgesia p. 28. 
Trumpets undivided, with well-marked 
meatus 9 
9. Trumpets long, with basal half or more 
tracheoid . . 10 
Trumpets short, or only moderately long; 
tracheoid area when present usually 
occupying much less than half the 
meatus 14 
10. Trumpet with tip highly modified for 
piercing plants; paddles narrowed and 
notched apically, without setae; no 
float-hair on segment 1 11 
Trumpet not modified for piercing; seg- 
ment I with normal float-hair or at 
least a seta in its place 12 
11. All abdominal setae very small and weak 
Mansonia ( Coquillettidia ) p. 37. 
Setae B and C forming long stout bristles 
Mansonia (Mansonioides) p. 37. 
12. Paddles very narrow, over four times as 
long as wide; trumpets very long, 
tracheoid for more than three-fourths 
of their length; float-hair reduced to a 
single stout seta 
Ficalbia (Etorleptiomyia) p. 33. 
Paddles not more than twice as long as 
broad; trumpets not so extremely 
long, and tracheoid for not more than 
two-thirds of their length; float-hair 
not a single seta . 13 
13. Dorsal seta placed far behind trumpets; 
paddles fringed or strongly denticulate 
and often with light or dark spots 
.....Ficalbia (Mimomyia) p. 35. 
Dorsal setae placed between or scarcely 
behind the trumpets; paddles with 
margins smooth or finely serrate but 
never fringed 
Uranotaenia (Uranotaenia) p. 29. 
14. Paddles without terminal setae 
Culex ( Acallyntrum ) p. 76. 
Paddles with at least the terminal seta 
(x) ..15 
15. Paddles nearly always with accessory seta 
placed beside the terminal seta; seg- 
ment IX nearly always with seta v 
present 16 
Paddles with terminal seta but without 
accessory seta; segment IX without 
seta v 21 
16. Paddles with serrate margins; seta v at 
least equal to the length of segment 
IX 
..Uranotaenia ( Pseudoficalbia ) p. 29. 
Paddles with smooth margins; seta v mi- 
nute, never more than one-fourth the 
length of segment IX 17 
17. Seta A far anterior to the postero-lateral 
corners on segments III-VI; paddles 
slightly notched at apex; large species 
Culex (Lutzia) p. 68. 
Seta A near to the postero-lateral corners 
on segments III-VI; paddles not 
notched at apex; size variable.. 18 
18. Seta K on segment I usually simple; all 
cephalothoracic setae small and incon- 
spicuous 
Culex ( Mochthogenes ) p. 69. 
