SO 
Table 3.--Effect of adding pyrethrins and/or N-isobutylundecenamide on 
the repellent time of repellents against Aedes taeniorhynchus. 
Average 
| N-Isobutyl- 
repellent time 
Repellent Pyrethrins ‘undecenamide 
Percent Percent Number Minutes 
Ethylene glycol ether 
of pinene == = 218 
4 
3 167 
== 7 192 
9) 211 
2 281 
3 167 
Ethyl hexanediol ie So 2 316 
-- 2 4 152 
4 256 
3 167 
2 191 
4 171 
i = 4 218 
4 176 
Indalone -- -- 1 
Pyrethrins eheckl! 5 == 4 33 
wy From a 20-percent pyrethrum concentrate in equal parts of white 
petroleum oil and the sodium salt of bis(2-ethylhexyl) sulfosuccinate. 
