Aedes of the Philippines — Knight and Hull 
229 
Judging from the fact that 6 months ex- 
tensive collecting in the Philippines pro- 
duced only two collections of vigllax ludlowi 
(both larval), this subspecies is apparently 
rather uncommon. Both of these collections 
were taken from small temporary ground 
pools surrounding rice paddies. The pools 
were recorded as being open to the sun, con- 
taining many algae, and possessing water 
rusty in appearance. Unfortunately no record 
was made as to whether or not the water of 
the pools was brackish in nature. However, 
Dr. E. S. Ross collected this species on 
Mindoro from shaded, temporary brackish 
pools at the edge of salt marsh. Penn (1948: 
245) reported a larval collection taken on 
Mindoro from a sunlit fresh-water pool with 
a pYi of 6.0. 
Aedes vigilax vigilax (Skuse), which is a 
widespread coastal species in the Austral- 
asian and Oriental Regions (but not re- 
ported from the Philippines), is a brackish- 
water breeder of great economic significance. 
After periods of unusually high tides the 
larvae occur in tremendous numbers in 
brackish pools along the seacoast just above 
the normal high-tide level. The adults soon 
emerge in great swarms, and since they are 
vicious and persistent day and night biters, 
they quickly succeed in seriously impeding 
all outdoor human activities in the surround- 
ing area. As with the salt marsh mosquitoes 
of the United States, the adults of v. vigilax 
will travel or drift considerable distances 
inland. Hill (1925: 71) reported that v. vigilax 
can occasionally be found in fresh water, and 
that larvae from such breeding sites possess 
longer and narrower anal gills than those from 
brackish water. 
DISTRIBUTION: Specimens examined. U.S.- 
N.M. (5 males, 11 females, 2 sets assoc, 
skins). Luzon: Olongapo, Subic Bay, Zam- 
bales Prov. (Zolik and MacMillan). Min- 
doro: Type females, Mangarin. C.A.S. (2 
males, 2 females, 2 larvae, 1 set assoc, skins). 
Mindoro: Nr. mouth of Labangan River 
(Ross). 
Literature records. Mindanao, Panay, Min- 
doro, Luzon (all Bohart, 1945: 56). Luzon: 
Manila (Edwards, 1929^: 2). Mindoro: 
Caminawit Pt. (Penn, 1948: 245). 
Not known from outside the Philippines. 
DISCUSSION : The Philippine form is treated 
here as a distinct subspecies of vigilax (Skuse) 
on the basis of the scaling of ppn in the 
female. In v. vigilax this area is covered with 
flat-lying slightly elongate broad scales, ex- 
cept for a fringe of narrow dark scales dorsally. 
The broad scales are dark except for a small 
ventral posterior patch of pale ones. The 
type of V. vigilax has not been seen by us, but 
the types of the synonyms uniformis Strick- 
land (female) and marinus (Theobald) (male, 
female), which are in the British Museum, 
have been. In addition, a series of Australian 
specimens in the British Museum and two 
females from the New Hebrides which are in 
the U. S. National Museum have been 
studied. In all these specimens of v. vigilax., 
ppn was found to be scaled as described above. 
No other differences have been found, al- 
though Philippine specimens have been com- 
pared with males, pupae, and larvae of the 
New Hebrides series. 
A. vigilax vigilax and v. ludlowi are com- 
monly confused with Aedes {Aedimorphus) 
vexans, from which species they can readily 
be distinguished by their lack of scales on 
the torus and on the subspiracular area. 
Subgenus Finlaya Theobald 
1903. Finlaya Theobald, Mon. Cul. 3: 281. 
Genotype: poicilia Theobald (Malaya). 
1905. Fopea Ludlow, Can. Ent. 37: 95. Geno- 
type: lutea Ludlow (Philippines). 
ADULT: Essentially similar to Ochlerotatus 
but differing in the absence of a distinct 
basal lobe on the basistyle in most species. 
Those few species that possess a distinct 
basal lobe differ from the single Philippine 
species of Ochlerotatus in not having the 
claspette filament setiform. Male palpi vary- 
ing from being three-fourths as long as pro- 
