126 
MALARIA 
the finding of oocysts in 6 of 27 A. argyri- 
tarsis which had fed on a carrier of P. falci¬ 
parum gametocytes. There are no data for 
P. malariae. 
b. Infection in nature. Covell (1927) 
doubts the record of Chagas (1904) “natu¬ 
rally infected” A. argyritarsis quoted by 
Boyd, * ‘ as the identity of the species found 
infected by him is uncertain.” Darling 
(1910) reported the finding of a single in¬ 
fected specimen in Panama with sporozoites 
in the salivary glands. According to Earle 
(1936b), negative results have been re¬ 
ported by Stephens (1921) in Venezuela, 
Boyd (1926) in Brazil, Davis (1927) in 
Argentina and Bennaroch (1928) in Vene¬ 
zuela. 
c. Epidemiological. According to Coveil 
(1927), de Verteuil (1925) suspected A. 
argyritarsis to be an important carrier in 
Trinidad on epidemiological grounds. Root 
(1926) notes that in Brazil this species is 
abundant in the plateau region, where there 
is little if any malaria, and that presumably 
it is not a very dangerous carrier of the dis¬ 
ease. Davis (1926), however, considers it 
to be the principal vector in the construc¬ 
tion camps in the mountains of the state of 
Rio. Earle (1936b), commenting on A. 
argyritarsis in Grenada, stated, “Nichols 
working in St. Lucia reported in 1912 that 
he found both A. argyritarsis and A. tarsi- 
maculatus (he called the latter A. albi- 
manus ) infected in nature and considered 
them of equal importance. While most of 
the other evidence is to the contrary, the 
results reported here from Grenada indi¬ 
cate that A. argyritarsis might be a malaria 
vector. A small outbreak of malaria oc¬ 
curred at Douglaston, Grenada, just before 
one of my visits, and I was not able to find 
any A. tarsimaculatus when I arrived. 
Argyritarsis was present in moderate num¬ 
bers. There are certain hill sections such 
as that back of Santeurs which have been 
rather malarious, and while A. tarsimacu¬ 
latus has been occasionally found there, A. 
argyritarsis has been the predominant spe¬ 
cies. As reported in this paper, I was able 
to infect A. argyritarsis readily in the labo¬ 
ratory. The fact, however, that it does not 
show a high preference for human blood 
and has never become abundant in these 
islands, probably renders it unimportant as 
a malaria vector.” Giaquinto Mira (1936), 
in Guatemala, observed that A. argyritarsis 
is found in all locations where A. albimanus 
exists but is less abundant in the lowest 
altitudes. He suggested that its importance 
as a vector probably is greater in the higher 
locations. 
The information concerning A. argyri¬ 
tarsis appears to be inadequate to determine 
its relative importance as a malarial vector. 
17. Anopheles (Nyssorhynchus) bach- 
manni 2 Petroechi 1925 
a. Experimental infection. Bennaroch 
(1928), in Venezuela, dissected 2 specimens 
after they had fed on a patient with an 
unknown type of malaria, with negative 
results. 
P. vivax. Rozeboom (1935), in Panama, 
reported the infection of two groups of A. 
bachmanni with P. vivax. In the first 
group 3 of 7 mosquitoes were infected, with 
oocysts, and in the other 3 of 11 had either 
oocysts or sporozoites. It was concluded 
that this species was less susceptible than 
the A. albimanus used as controls. 
P. falciparum. Rozeboom (1935) also re¬ 
ported experiments with mosquitoes which 
undoubtedly were A. bachmanni, and after 
feeding them on P. falciparum gametocytes, 
2 of 13 specimens were infected, with 
oocysts in the stomach. Seven of 14 A. 
albimanus controls were also infected. 
There are no data for P. malariae. 
b. Infection in nature. Bennaroch 
(1928), in Venezuela, dissected 75 A. bach¬ 
manni with negative results. Rozeboom 
(1938a), in Panama, examined 3 specimens 
obtained from human dwellings and 320 
collected from pigs, and found none in¬ 
fected. 
c. Epidemiological. This species has 
been suspected as a malarial vector in Vene¬ 
zuela on epidemiological grounds by Benna- 
roeh (1931); and precipitin tests done there 
show that while it prefers animal blood, it 
2 Name changed to A. triannulatus by Neiva and 
Pinto. 
