Ie 
Miscellaneous Aedes species and Culiseta incidens 
The various standard repellents were tested both in the laboratory 
and in the field against several species of Aedes and C. incidens in 
Oregon. Table 9 shows that ethyl hexanediol and the mixture 6-2-2 
were generally superior to Indalone or dimethyl phthalate. In four 
other tests against A. dorsalis the average protection time was 376 
minutes with. 2-(2-butoxyethoxy)ethyl acetate, 277 minutes with benzyl 
benzoate, and 75 minutes with butyl phthalate. 
Tests with other compounds against the mixed population containing 
Aedes sticticus and vexans are summarized in table 10. In addition 
6 tests with an 80:20 mixture of dimethyl phthalate and ethyl hexanediol 
gave an average repellent time of 368+ minutes, and 4 tests with a 
powder-paste cream containing 69 percent of dimethyl phthalate, 151 
minutes. Conclusive data were not obtained with many of the repellents, 
as it was frequently necessary to terminate the tests before a bite was 
received. The data show that these mountain Aedes are rather easily 
repelled. 
The repellent times against Culiseta incidens are considerably 
longer than for the various Aedes species (table 9), probably because 
of the low biting rate prevailing during the test. 
Mansonia perturbans (Wlkr.) and titillans (Wlkr.) 
In tests with some of the more promising repellents against a mixed 
population of these species in Florida, it was found that they are easily 
repelled and that the standard repellents give good protection (table 11). 
Aedes spp. 
In 1945 W. V. King and Army coworkers made tests in New Guinea 
against a mosquito population containing more than 99 percent of a 
species of Aedes subgenus Aedes near similus (Theob.) and the 
remainder of Culex halifaxii Theob. and Armigeres sp. (table 12). 
The biting rates averaged 9.5 on arms and 13 on legs in 5 minutes. 
The skin was moderately wet with sweat during the tests. Phenethyl 
ester of 2-methyllactic acid was found to be the best material. 
In 1943 H. H. Stage, of the Bureau of Entomology and Plant Quarantine 
and Terris Moore, of the Office of the Quartermaster General, U. S. 
Army, made a number of field tests with the standard repellents in 
Churchill, Canada (table 13). The mosquito population was predominantly 
Aedes nearcticus Dyar with some cataphylla Dyar. The repellents were 
applied to the arms and legs by the standard procedure. Mixture 6-2-2 
was found to be more effective than any one of its ingredients. A paste 
made of ethyl hexanediol and bentonite (not included in table) gave an 
average of only 26 minutes’ protection in 9 tests. 
