42 
PROPHYLAXIS OF MALARIA. 
species of mosquitoes which may be present and the feasibility of 
getting rid of them should be as carefidly investigated as the char¬ 
acter of the water supply, the terrain, or any other feature of the 
locality. 
The classification of mosquitoes, as regards genera and species, is 
still an unsettled question among entomologists, but in the following 
pages I shall follow that of Theobald, who divides the Anophelince into 
several genera, each containing several species. Of the genera given 
by Theobald, the following contain species that have been proven to 
transmit malaria: Anopheles , Myzomyia , Stethomyia , Pyretophorus, 
Arribalzagia , Myzorhynchus , Nyssorhynchus , and Cellia. 
For convenience of reference I have prepared the following table, 
giving the geographical distribution of the species of mosquitoes 
which have been proven to transmit the malarial fevers. The table 
can not be considered as complete, as observations are being continu¬ 
ally published demonstrating the transmission of these infections by 
hitherto unsuspected species of the Anophelince , but it will serve as 
a guide to the commonly observed species which transmit malaria in 
the regions mentioned. 
Locality. 
Species of malaria mosquitoes. 
United States 
West Indies. 
Canal Zone, Panama. 
Philippine Islands. 
Central and South America.... 
I 
Europe. 
Asia.I 
Africa 
Cellia albimanus, Cellia argyritarsis, Anopheles macvlipennis, Anopheles 
quadrimaculatus, Anopheles crucians, Anopheles intermedium , Anopheles 
pseudomaculipes, Anopheles pseudopunctipennis, Anopheles tarsima- 
culata. 
Cellia albimanus, Cellia argyritarsis. 
Cellia argyritarsis, Cellia albimanus, Anopheles pseudopunctipennis, Ano¬ 
pheles iarsimaculata. 
Myzomyia funesta, Myzorhynchus sinensis, Myzorhynchus barbirostris, 
Myssorhynchus fuliginosus, Myzomyia ludlovciif 
Anopheles albipcs, Pyrctophorus lutzii, Cellia argyritarsis, Cellia albimanus, 
Anopheles pseudomaculipes, Anopheles intermedium, Anopheles cruzii. 
Anopheles maculipennis, Anopheles bifurcatus, Anopheles superpictus, 
Myzomyia hispaniola, Myzorhynchus pseudopictvs. 
Myzomyia culicifacies, Myzomyia listonii, Myzomyia turkhudi, Myzorhyn¬ 
chus barbirostris, Myzorhynchus sinensis, Nyssorhynchus theobaldi, Nys¬ 
sorhynchus stephensii, Nyssorhynchus fuliginosus, Nyssorhynchus maculi- 
palpis, Pyrctophorus jeyporensis. 
Myzomyia funesta . Myzomyia nili. Myzorhynchus barbirostris, Myzorhynchus 
paludis, Cellia pharoensis, Pyrctophorus costalis, Pyretophorus chaudoyci. 
If one desires to follow the classification of Howard, Dyar, and 
Knab, the generic names in the above table should all be replaced by 
the generic name, Anopheles. 
The number of infected mosquitoes in malarial regions. —It is 
obvious that the number of mosquitoes infected in different localities 
will vary with the number of infected individuals present, the sea¬ 
son of the year, certain atmospheric conditions, and the care observed 
by the inhabitants in protecting themselves from the bites of mos¬ 
quitoes. At the present time we have no evidence that the infection 
in the mosquito is hereditary, so that it follows that every infected 
mosquito must have become infected from a human being, and one 
infected individual may infect scores of mosquitoes within a few 
