- : ♦ : Celliphoridae 
* * ■ ' • 
Calliphora erythroceohala Meig.-. . "" •' - •' '3 '/-;•■■ ■ 
This species ^as tested by the immersion 'technique of. 
Crsufurd-Benson (64) , as reported in 1938, end has giver, some 
interesting and reliable information, although* the results '-ere 
not so accurate as those of "other workers who Used, the suraying 
method. ' • ■ . .. i 
* ■ . . •• - . 
C alliuhpre sp . "•'".-: 
7ilbaux (321) in 1934 tested extracts of the leaves. of 
Tephrosia vogelii that were 22 years old and reported that as' 
a contact insecticide the leaves are about as. toxic- as nicotine. 
Larvae of Calliphora sp. .were, perfectly resistant, even to sprays 
containing 1 part of T. vogeii^i to 200 lf of dry vegetable matter, 
Pupation 'took place more rapidly, but all'Uhe nupae hatched. 
Co chliomyia macelleria F. , the secondary screwworm, • 
Parman et al. (225) -and also Roerk'et al. (242) in 1927 
reported results of che.motronic tests. A com'nerical derris' pow- 
der repelled 95'percent of the flies visiting a br.it -of beefliver. 
This is about the same percentage ae that Obtained with pyre thrum 
powder. TThen diluted with 9 parts* of kaolin it repelled.. 38 per- 
cent.. . . 
C ochliomyia amer'icana -C. &.P., the scrcwrorm 
In 1928 Parman et al. ( 226 ) 'reported that derris powder (0.5 
gm. plus kaolin 4.5 gnu), spread upon 4-ounce cubes of beef liver 
in a mason jar, repelled 38 percent of the flies that approached 
the meat. ' 
E. W, Laake, in a typewritten report to the Division of 
Insects Affecting Man and Animals, Bureau of Entomology and 
Plant Quarantine, United States "Department <?f Agriculture, in 
1935, reported results of field tests by McGovran and Ellisor . 
of repellents for wound- infesting flies on sheep- and goats at 
Valdosta, Ga. Rotenone, derris resin, and derris root mixed 
TrT 'ith pine- tar oil and benzene seemed .to be the most promising 
mixtures. The fo'Ho^-rng mixtures' were tested with excellent 
results: 
Pine-tar oil. 75 parts, benzene 24 parte, .. ._ _ 
rotenone 1 part. ' . . 
Pine- tar oil 75 parts, benze-ne 24 parts, 
derris resin 1 part. ~~~ ~ 
Pine-tar oil 75 parts, benzene 20 parts, 
derris root 5 parts. 
The following were found to be unsatisfactory as repellents: 
A mixture of pine-tar oil 70 parts, sulfonated castor oil 
