462 
PACIFIC SCIENCE, VoL VII, October, 1953 
Fig. 7. A. {Aedimorphus) vexans nocturnus. Larva 
(Samar), a. Head; b, terminal segments. 
12 single, stout; hair 11 very small, with 1-3; 
a short acutely tapered spine at base of tuber- 
cle. Metathoracic hair 9 with 4-6 branches; 
10 single, stout; 12 single, much reduced; 
11 very small, with 1-5. Abdomen: Dorso- 
lateral hair on I with 3-8 branches; on II 
with 3-6. Lateral hairs on I and II with 2-4; 
on III-V with 1-4; on VI with 1-3. Pentad 
hair 1 with 5-11 branches; 2 and 4 with 1-3; 
3 with 5-9; 5 with 6-10. Comb with 8-10 
teeth, long, acutely tapered, with attached 
portion oval in shape and fringed laterally. 
Siphon smooth with a narrowly attached acus, 
index 2. 1-3. 2; 13-19 pecten teeth in a row, 
the distal two more widely separated, each 
tooth except the distal two or three with 1-3 
ventral denticles; siphon hair tuft with 3-7 
branches. Anal plate incomplete, smooth, 
with an attached acus; Ih small, single or 
double; isc with 6-9 branches, osc single; ven- 
tral brush of 16 (rarely 15-18) tufts with 3 or 
4 off the barred area basally, elements of 
barred area joined laterally by a bar, tufts of 
ventral brush with 4-11 branches. Anal gills 
subequal, narrow and gradually tapering to 
apex, or broad at base and rapidly tapering 
to apex; 1.7 to 2.4 times longer than anal 
plate. 
BIONOMICS: The adults were commonly 
collected while trying to bite humans at night, 
and from a light trap. The larvae were fre- 
quently encountered in temporary rain-filled 
ground- pools and depressions of all types, 
but principally from those in grassy areas. 
DISTRIBUTION: Specimens examined. R.K.L. 
Luzon: Olongapo, Subic Bay, Zambales Prcv. 
(Rozeboom, Zolik, McMillan). Samar: Os- 
mena (Laffoon, Rozeboom). Palawan: Iwahig 
Penal Colony, Puerto Princesa, Bacungan, 
Tacburos, and Balsahen River (Johnson, Laf- 
foon, Fitzgerald). Mindanao: Zamboanga and 
San Ramon (Johnson, Knight, Laffoon). C. 
C. Luzon: Sison, Pangasinan Prov. (Francle- | 
mont). Baisas Coll. Luzon: Tunkong Manga, 
Bulacan Prov. Colo. State U. Coll. Mindoro: 
San Jose. (Howe.) i 
Literature records. Mindoro: Caminawit ' 
Point (Penn, 1948: 245). Tunkulan (Edwards, | 
1929: 5). Luzon: Manila (Edwards, 1929: 5).^ | 
Outside the Philippines, this subspecies is 
known from Samoa, Tonga, Fiji, New He- j 
brides, New Caledonia, Australia, New 
Guinea, Marshalls, Marianas, and Nether- i 
lands Indies. 
DISCUSSION: Bohart and Ingram (1946: 15) | 
resurrected the name nocturnus for the vexans f 
of the Australasian region and of the Philip- !| 
pines. They consider the material known to j 
date from these areas to be subspecifically 1 
