Circular 23 - Reference Index 
6l 
Whip scorpions (Vine- 
gerones ) 
habits; effect 
15-27. 
Winter ticks ( Dermacen - 
tor albipictus (Pack.) 
and D. nlgrollneatus 
(Pack. )T~^ 
control 12-22. 
development. . .12-22. 
habits 12-10. 
Wire cloth (screening) 
uses; types; manu- 
facturers and dis- 
tributors. . . .20-46. 
Wolman salts (pressure- 
treated wood) 
manufacturers and 
distributors. .2-41. 
Wood ticks (see Ticks) 
Workers 
caste of termites 
2-2. 
Wrapping 
cured meats to pre- 
vent infestation 
5-8. 
Wrigglers (mosquito 
larvae) 7-3. 
collection of samples 
7-4. 
control 7-18. 
fish as control aids 
7-17. 
Xenopsylla cheo-osis 
(Roths. ) 
oriental rat flea 
13-2. 
Yellow fever mosquito 
(also see Aedes (mos- 
quitoes ) ) 
breeding requirements 
7-11. 
exclusion 7-21. 
scientific name.. 7-7. 
Yellow jackets 
habits 15-13. 
Zinc chloride (pressure- 
treated wood) 
federal specifications 
2-23. 
manufacturers and 
distributors. . .2-40. 
Zinc meta arsenite 
(pressure-treated wood) 
manufacturers and dis- 
tributors 2-41 . 
Zinc oxide 
use to treat skin 
irritations. . .15-18. 
