xB, Barber et al.: Malaria in the Philippines 179 
THE DISTRIBUTION OF ANOPHELINES 
LARV4 
In determining the number and character of the larve of a 
locality, the following method for the most part was employed: 
Larve were collected in jars and bred, and the species were de- 
termined from the imagoes. In a large proportion of the local- 
ities for which the malarial index was determined, the character 
of the mosquito fauna and the breeding places of the mosquitoes 
were also surveyed. An anopheles-mosquito survey was made 
of many other localities. For the determination of some species 
we are under obligations to Prof. C. S. Banks, entomologist of 
the College of Agriculture of the Philippine Islands. In general, 
we have found the relative numbers and habitats in various 
provinces much the same as they are in the neighborhood of Can- 
lubang, Laguna Province, Luzon, which was very thoroughly | 
surveyed by Walker and Barber. Anopheles rossi is by far 
the most abundant and the most widely spread. Anopheles 
febrifer and A. barbirostris come next in order of abundance; 
of these, A. febrifer, although of more restricted habitat, probably 
exceeds A. barbirostris in abundance, because of the far greater 
numbers of larve found in the breeding places. Anopheles 
sinensis probably ranks fourth. Its relative abundance is rather 
difficult to determine, since it is preferably a rice-paddy breeder, 
and may occur in considerable numbers under certain circum- 
stances. Anopheles maculatus is probably the least plentiful of 
the five species, since its breeding places are restricted, and rel- 
atively few mosquitoes are found in them. A wider search 
conducted in each locality through all months of the year may 
change the order given for the last two, but probably not for 
the first three. Thus far no other species has been found in 
any considerable abundance.‘ 
* Loe. cit. 
*Specimens of anopheles from larve collected in a brook at Buhisan, 
Cebu, were sent to Dr. C. S. Ludlow, of the Army Medical Museum, Wash- 
ington, D. C., who identified them as Myzomyia parangensis Ludlow. These 
larves were very plentiful in the brook at Buhisan, and have been found 
by one of us (Barber) in Bugsanga River, Mindoro, where they occurred 
in abundance in May. Specimens from this lot of mosquitoes were identified 
by Mr. C. S. Banks, entomologist of the College of Agriculture of the 
Philippine Islands, as Myzomyia rossi. In view of the rather indetinite 
status of this species, we have in this paper taken the more conservative 
ground and included it and some very similar forms under the name 
Anopheles (Myzomyia) rossii. We believe that breeding experiments with 
this and similar doubtful forms should be carried out in order to determine 
