222 
PACIFIC SCIENCE, VoL V, July, 1951 
Ventral brush of 14-15 tufts; anal 
plate incomplete 26 
26. Head hairs 5 and 6 with 3 (sometimes 
2) branches with the median branch 
stouter and much longer than the 
lateral branches; antennal spicules 
darkly pigmented . . . (Aedes) nigrotarsis 
Head hair 5 with 1-4 branches; hair 6 
single, stout; antennal spicules pale 
{Aedes) uncus 
27. Head hair 15 developed as a stout, 
curved, horn-like projection 
{Stegomyia) meronephada 
Head hair 15 normal, small, usually 
branched. 28 
28. Pecten teeth evenly spaced, 20-24 in 
number {Finlaya) lacteus 
Distal pecten teeth more widely 
spaced, 5-20 in number. 29 
29. Ventral brush with 3-5 tufts off the 
barred area basally; comb teeth with 
a strong central spine about as long 
as the base of the teeth; antennal 
spicules stout, dark 
. {Banksinella) lineatopennis 
Ventral brush with 1-2 tufts off the 
barred area basally; comb teeth 
with central spine no more than 
one-half as long as base of teeth, or 
with no prominent central spine 
present; antennal spicules small, 
pale 30 
30. Comb teeth with a complete apical 
fringe, no prominent terminal spine; 
pentad hair 2 with 4-6 branches; 
mentum with 11-13 lateral teeth. . 
{Aedes) butleri 
Comb teeth with a distinct terminal 
spine; pentad hair 2 with 1-3 
branches. 31 
31. Mentum with 8-11 lateral teeth; anal 
gills 1.0-1. 5 times as long as anal 
plate : . {Aedes) dux 
Mentum with 1 3 or more lateral teeth ; 
anal gills at least 1.7 times as long as 
anal plate. ..................... 32 
32. Head hair 5 with 2-3 branches; hair 
6 with 2-4 branches .... {Aedes) robertsi 
{Aedes) hamistylus 
Head hair 5 with 5-10 branches; hair 
6 with 4-8 branches. . 33 
33. Mentum with 18-20 lateral teeth; pro- 
thoracic hair 2 single; pro thoracic 
hair 8 double {Aedes) campylostylus 
Mentum with 13-18 lateral teeth; pro- 
thoracic hair 2 single or double 
(usually double); prothoracic hair 
8 single or double (usually single) 
{Aedes) johnsoni 
{Aedes) margarsen 
34, Antennal hair with 5-7 branches (rare- 
ly 4) . . 35 
Antennal hair with 1-4 branches .... 36 
35. Siphon index 3. 4-3. 8; pecten teeth 
with lateral fringe; comb scales with 
blunt, fringed tips .............. 
. {Rhinoskusea) longirostm 
Siphon index about 2.7; pecten teeth 
with 2-4 large denticles; comb 
scales simple, sharply pointed. . . . 
. {Cancraedes) curtipes- 
36. Ventral brush with 10 tufts (rarely 9 
or 11) 37 
Ventral brush with 12 tufts (rarely 11 
or 13) 46 
37. Anal plate bare, or with a few small 
spicules 38 
Anal plate with long spines or scales 
on posterior margin . 40' 
38. Pecten with 23-26 close-set teeth with 
basal denticles 
{Finlaya) leucopleurus (in part)' 
{Finlaya) aureostriatus (in part) 
Pecten with 7-17 teeth; each with 
fringe along entire ventral margin . 39' 
39. Head hair 4 with 6-10 branches ..... 
. {Skusea) amesit 
Head hair 4 with 13-20 branches. . . . 
{Skusea) fumidus- 
40. Pecten with 18-29 teeth 
............... {Finlaya) melampterm 
Pecten with 4-13 teeth ............ 41, 
41. Preclypeal spine with at least 2 
branches (rarely single in pokilius)\ 
prothoracic hair 0 large, stellate, 
with at least 9 branches; margin of 
anal plate, ventral to Ih with large 
spines 42: 
Preclypeal spine single; prothoracic 
hair 0 small, with not more than 5 
branches ; no spines ventral to Ih on 
margin of anal plate 44- 
