48 THE FLORIDA BUGGIST 
It is not abundant, and is found predatory in both the larval and adult stage 
on the avocado red spider mite. 
Prospaltella sp—This species is a small hymenopterous parasite, fre- 
quently bred from the pupal and larval stages of the avocado white fly, 
Trialeurodes floridensis Q. 
Cryptognatha (Delphastus) pallida, Lec.—This a small lady bird beetle, 
light brown in color and about the size of a pin head. It is one of the 
Secymnus group. The larvae are whitish in color. Both the larvae and adults 
are very beneficial, being predatory upon the avocado white fly in the larval 
and pupal stages. 
Scolothrips sexmaculatus, Pergande.—This thrips, which is light in color, 
possesses six spots on the abdomen. It was not found by the writer to be 
abundant and feeds when present in both the larval and adult stages on all 
stages of the avocado red spider mite, Tetranychus yothersi, McG. 
Aspidiotiphagus citrinus, Craw.—A hymenopterous parasite found to be 
destroying considerable numbers of the dictyospermum scale, Chrysomphalus 
dictyospermi, M. 
MOSQUITOES FOUND ABOUT GAINESVILLE, FLA. 
(Continued from page 43) 
Baume, oil in some pool and creek beds that could not be readily 
drained, with good success. He found this to be efficient for 
from one to four weeks, depending upon the nature of the pond 
and the exposure to the wind. To be on the safe side, the pond 
should usually be oiled every two weeks. He used a barrel spray 
pump in the accessible places and a knapsack pump in the others 
to good advantage, but it may be simply poured on from a sprink- 
ler or applied from a bucket with a mop. In inaccessible swamps, 
it is sometimes applied by standing a barrel on end and boring a 
small hole near the bottom so there will be a constant drip. 
In the Panama Canal work there was considerable difficulty 
in getting the oil to completely cover the surface when the vegeta- 
tion was thick. There they found a solution made from one hun- 
dred and fifty pounds of sulphuric acid, one hundred and fifty 
pounds of powdered resin, and thirty pounds of caustic potash 
boiled together made a good larvaecide (Gorgas 1909), which, 
in some cases, was more effective than fuel oil. 
A pool on the campus between Buckman and Science Halls, and 
the septic tank back of Thomas Hall, have been treated with 
“Zenoleum” disinfectant twice. This forms a milky mixture 
with the water and kills the larvae in a short time. Both pupae 
and larvae were found alive four hours after application, but all 
were dead next morning. No record was obtained of how much 
was applied, but enough to make the water appear decidedly 
milky. It was found to prevent egg laying for about twelve days, 
and should be applied about every two weeks. 
