-89- 
species of mirids. Sodium fluosilicate gnve an increpse in yield 
of 517 pounds of seed cotton per sere, and derris (4 percent of 
rotenone), 151 pounds. A year later lead arsenate gave 523 pounds 
and derris-sulfur, 206 pounds.— Cassidy and Barber (106 ). 
Pyrrhocoridae 
Pysdercus fasciatus Sign., a cotton stainer 
In Africa a bait including 5 percent of derris powder (5 percent 
of rotenone) was almost as toxic as sodium arsenite and much more 
attractive.— Rainey (488 , p. 48). 
Tingitidae 
Stephanitis pyrioldes Scott, the azalea lacebug 
A spray containing 0.83 percent of oil and 1.5 pounds of derris 
(5 percent of rotenone) per 100 gallons of water was effective in 
control. For the eradication of infestations in nurseries, applica- 
tions should be made every 3 weeks. A 3-percent nicotine dust and a 
dust containing 0.75 percent of rotenone were ineffective.— English 
(166 ) j English and Turnipseed (168 ) . 
Teleonemia nigrina Champ. 
Derris dust was unsuccessfully tried to control this tingitid 
on snapdragon plants.— H'ixs on (287 ) . 
DIPTERA 
Agromyzidae 
Agromyza oryzella Mats* 
Sprays of nicotine sulfate (1:800 and 1:1000) were tested in 
Japan* The stronger one killed all the eggs and more than 90 per- 
cent of the larvae, while the weaker one and a derris spray each 
killed more than 90 percent of the adults and larvae.— Oka zaki (449 ) . 
Bibionidae 
(Dilophus ) Philia febrilis (L.), fever fly 
The larvae damage roots of grass in lawns. Field experiments 
were carried out in three heavily infested areas in Wales. The 
