- 7** - 
Psorophora ell lata (F.) 
P. confinnis (L. Arr.) 
Same a3 for Aedea aollicltans . — Fluno fil fil. (112) • 
Unidentified mosquitoes 
As a larvicide for anopheline and several species of cullcine mos- 
quitoes, chlordane generally proved inferior to DDT in both laboratory 
and field tests.— Knipling (264). 
In laboratory tests chlordane proved highly toxic to the four th-instar 
larvae of eleven species of California mosquitoes. — rCichelbacher ( 326 ) . 
Hippoboscidae 
Melophagus ov inus (L.), the sheep-tick, sheep ked 
Chlordane sprays have given excellent control.— Knipling (264). 
Puparia were dipped in 0.5 percent suspensions of Insecticides and 
held at room temperature (67-30° F.) or at a constant temperature of 80° 
F. and a relative humidity of 50 to 70 percent. Chlordane caused little 
if any mortality of pupae. The addition of a wetting agent did not enhance 
the effectiveness of the materials. — Hoffman ( 22l ). 
Sheep ticks exposed to 24 mg. chlordane per square foot at 70° F. 
suffered 65 percent mortality and at 90° F. they suffered 98 percent mortal- 
ity.— Hoffman e_t al. (224). 
A 0.125 percent chlordane emulsion was effective in dipping testa, but 
less effective when applied as a spray. A 2-percent chlordane dust gave 
poor control. — Tibbetts and Sorenson ( 45^ ) . 
In tests at Corvallis, Oregon ticks collected from sheep were exposed 
on khaki wool patches thAt had been dipped in an acetone solution of the 
insecticide. After exposing the ticks for 30 minutes at 70° F., they were 
transferred to beakers containing bits of cheesecloth and kept at 70° to 
80° and an average humidity of about 75 percent. Chlordane was one of the 
insecticides which failed to give 100 percent mortality in 24 hours on cloth 
treated at the rate of 25 mg. of insecticide per square f oot .— GJullin ( 176 ). 
Dipping tests showed that 0.2 and 0.5 percent concentrations of chlor- 
dane caused complete or nearly complete control of sheep ticks during the 
entire 110-day period of the test. Wool samples collected from the treated 
sheep and exposed to houaeflies showed a high decree of toxicity for chlor- 
dane at the 0.05 percent concentration. When Shropshire ewes in heavy 
fleece were sprayed with 2.7 quarts of 0.2 percent chlordane, not all the 
sheep ticks were killed. — Fairchild ej. al. ( 13t ): U. S. Eur. Ent. and Plant 
Quar. (463). 
