28 
Circular 23 - Reference Index 
Harvester ants ( Pogo - 
nomyniiex spp . ) 
sting. 15-3* 
Harvest mites (see 
Chiggers) 
Head louse ( Pediculus 
hum«nus humanus L « ) 
.9-2. 
biology 9-3 • 
dissemination. . .9-7. 
female and egg 
(illus. )9-4. 
treatment for control 
hair 9-8. 
hats 9-10. 
Heat treatments 
control Lyctus 
( powder-post ) 
beetles 6-12. 
Hide beetle ( Dermestes 
vulpinus Fabr. ) 
important larder 
beetle 5-5. 
Hodge traps 
stable fly control 
... 17-10, (illus.)ll. 
Honey 
use in poisoned ant 
baits 15-9. 
Honeybees 
habits 15-13. 
removal of sting 
15-13. 
Hornets 
control 15-14. 
habits 15-13. 
Horn flies 
control 19-11 • 
female (illus . )19-10. 
habits 19-10. 
life history.. .19-11. 
Siphona irritans L. 
19-10. 
Horse bots 
common ( Gastrophilus 
lntestinalis De 
(Jeer) .16-2. 
control 16-9 . 
destruction of eggs 
16-10. 
distribution in U. S. 
16-6. 
effects on horses and 
mules. .16-1; 19-9, 10. 
egg-laying habits 
............... . -LO - 'J* 
eggs. .16-3, (illus. )4. 
kinds and distinguish- 
ing characters 16-2. 
larvae 16-4, 
(illus. )5, 6. 
life history; 
seasonal activity 
16-7. 
manner of injury 
. 16-6; 19-9. 
nose fly ( Gastrophilus 
haemorrhoidalis L. ) 
16-2 . 
protective devices 
16-9. 
pupal stage 16-9 . 
references 16-13. 
throat bot fly ( Gas - 
trophilus nasalis L. ) 
16-2. 
treatment of horses 
and mules 16-10. 
