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INTRODUCTION 
This is the eleventh in a series of papers designed to revier all 
available information on the insecticidal uses of rotenone and the rotenoids, 
Parts I-X have reviewed tests with derris, cube, timbo, Tephrosia, Mundulea, 
and their constituents on members of the Collembola, Orthoptera, Dermaptera, 
Odonata, Isoptera, Corrodentia, Mallophaga, Thysanoptera, Homoptera, Plemiptera, 
Anoplura., Coleoptera, Lepidoptera, Kymenoptera, Eiptera, and Siphonaptera. 
Apparently no tests with the rotenone plants upon Thysanura, Ephemeroptera, 
or Plecoptera have been recorded. Part XI, the present paper, reviews the 
tests and recommendations for use on Acarina (Class, Arachnida) . 
ACARINA 
Argasidae 
Argas miniatus Koch, the fowl tick 
Little (93) in 1931 reported that laboratory tests on adults of the 
fowl' tick showed both devil' s-shoestrings and derris. to be ineffective, 
Ornithodoros moubata Murray 
0. tartakovskyi Olenev 
Mironoff et al. ( 106 ) in 1940 reported tests with rotenone against ticks. 
The nymphs of these two species were resistant to derris powder. 
Dermanyssidae 
Ophionyssus serpentium Hirst 
Schroeder (135) in 1934 reported that a solution of derris (acetone 
extract of derris added to water) is effective as an acaricide for dipping 
snakes. Such a dip does not interfere with the physiological function of 
shedding, is not toxic to the snake, yet is entirely efficient in the de- 
struction of snake mites, 
Eriophyidae 
Epitrimerus vitis Nal, 
Stellwaag (141) in 1938 recommended a pyrethrum-derris spray as a spring 
