Circular 23 - Reference Index 
Biting horse lice 
control 19-4. 
description and life 
history 19-3. 
(illus. ) 19-4. 
injury 19-4. 
species 19-3. 
Biting houseflies 
(see Stable flies) 
Biting lice . 
description; habits 
19-2. 
Black blowfly 
( Phormia regina Meig.) 
maggots used in 
disease treatment 
8-16. 
Black carpet beetle 
( Attagenus piceus ) 
adult 
3-3, (illus.) 5. 
larva 
3-3, (illus.) 6. 
Black flies (or 
buffalo gnats) 
adult 8-26,27. 
control 8-26 . 
description and 
habits 8-26. 
larvae 8-26 . 
not disease trans- 
mitters in the 
transmission of 
Onchocera worm 
8-24. 
Black-legged tick 
( Ixodes ricinus 
goapulari s ( Say ) ) 
occurrence 12-5. 
Black widow spider 
appearance 15-23. 
bite and effect 
15-23. 
control 15-24. 
distribution and 
habits 15-23. 
references to litera- 
ture 15-26. 
treatment for bites 
15-24. 
Blatta orientalis L. 
(see Oriental roach ) 
Blattella germanica L. 
(see German roach) 
Blocking 
termite control 2-33. 
Blood albumin 
emulsifier 21-5. 
Blood-sucking flies 
kinds and importance 
8-24. 
Blower type duster 
description and 
uses 20-36. 
manufacturers and 
distributors. .20-37. 
Blowflies 
association with 
sorewworms 18-3 . 
