321 
RELATIVE ABUNDANCE OF MALARIAL MOSQUITOES, CARBONDALE, 1919 
A number of writers have raised a question as to the comparative 
importance of Anopheles guttulatus and A. punctipennis as carriers of 
malarial disease, it being believed by some that guttulatus is the more 
active carrier. The preponderance of punctipennis in my records indi- 
cates that this can hardly be the case. In 1918 guttulatws was taken in 
only four different collections during the year, while punctipennis was 
taken in nineteen. In 1919 seventy-six adults were obtained at Carbon- 
dale and only six were guttulatus. Guttulatus being so rare in Carbon- 
dale, I think the other species must be held responsible for most of the 
malaria present. 
Mr. H. R. Carter and associates, of the U. S. Public Health Ser- 
vice,* report that they found guttulatus predominating in Alabama and 
South Carolina in their August and September surveys, and punctipennis 
in spring to June 15 and in fall. They qualify this, however, by say- 
ing that in August and September the live water contains most of the 
punctipennis and the bayou water the guttulatus. The following table 
shows the relative numbers of adults of each species collected in Carbon- 
dale from May to October, 1919. 
May June July August | September | October 
A. guttulatus....... 1 0 1 ord 0 
A. punctipennis..... 20 35 1 1 13 
From this it would seem that the spring and fall results at Carbon- 
dale agree with those found in Alabama and South Carolina. The re- 
lation in July and August is doubtful, as not enough specimens were 
obtained for a definite conclusion. A point clearly brought out by the 
species table (p. 320) is the adaptability of Anopheles punctipennis to all 
types of breeding-places. Both in 1918 and 1919 it was found in all 
seven; and in June, 1918, and May and June, 1919, it was found in six 
of the seven types each month. Aédes taeniorhynchus Weidemann has 
been recorded from Illinois by Dr. Ludlow, but Howard, Dyar, and Knab 
say that it does not occur in this state as it is supposed not to be found 
over forty miles from salt water. The species mentioned last in the list 
given on page 320 is very probably that recorded by Dr. Ludlow, but it 
is apparently different from taeniorhynchus. Aédes sylvestris appears to 
be chiefly an early species. My records agree in this respect with the 
statement made by Howard, Dyar, and Knab:} “In the South the species 
[Aédes sylvestris] partakes more of the character of an early spring 
species, the majority of the specimens developing early from over- 
*U. S. Public Health Service, Pub. Health Bull. No. 79, pp. 11-17, by H. R. 
Carter, J. A. A. Le Prince, and T. H. D. Griffiths. 
+ ‘Mosquitoes of North and Central America,” Vol. IV, p. 697. 
