30 BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 
Caryophyllns aromaticuti L Mybtaceae. Synonym: Eugenia aromatica Baill. 
dovetree. Tropical regions. 
Scott. Abbott, and Dudley (S3, p. 13, 34) found powdered cloves 
ineffective against roaches, but efficient against the larvae of carpet 
beetles, and Abbott (1, p. 7, 11) found them efficient against chicken 
lice and the dog flea, although he does not recommend them on ac- 
count of their high cost. 
Cassia occidentalis L. Caesalpiniaceae. Coffee senna. Widely diffused in 
tropical countries. 
Riley (71, p. 186) reports that an alcoholic extract and a decoction 
had a slight effect on cotton caterpillars. 
Scott, Abbott, and Dudley (8J, p. 13) found Cassia (species not 
given) ineffective against roaches. 
Cassia stipulacea Ait. Chili. . 
Greshoff (3jt, p. 67) reports that the leaves are used as an insecti- 
cide. 
Catalpa bignonioides Walt. Bignoniaceae. Catalpa. 
The writers' results are given on page 21. 
Causia and Cebolleja. (See footnote on page 26.) 
Herrera (40, p. 21) obtained no practical results by using both of 
these against the winged forms of fruit maggots. 
Ceratotheca integribracteata Engl. Pedaliaceae. Tropical Africa. 
Greshoff (33, p. 145) says that the decoction is used in West Africa 
as an insecticide. 
Cereus sp. Cactaceae. Cactus. 
Howard (44, V- ^4) savs that cactus leaves, made into a sticky 
paste and spread over the surface of the water, kill the larva? of mos- 
quitoes by asphyxiation. 
Charcoal (kind not stated). 
Scott, Abbott, and Dudley (83, p. 13, 26) found charcoal ineffec- 
tive as a dust against roaches and ineffective as a fumigant against 
clothes moths. 
Chelidonium majus L. Papavebaceae. Swallow-wort. 
Goriainov (29) determined that a decoction killed 4 per cent of 
the larva? of Malacosoma neustrui and 44 per cent of the Vanessa 
urticae tested. 
Chenopodium ambrosioides L. Chenopodiaceae. Synonyms: 0. anthelminti- 
cum L. C. ambrosioides anthelminticum A. dray. American wormseed. 
Tropical America, naturalized in the United Stales. 
Riley (77, />. 186) reports that an infusion and an alcoholic ex- 
tract from the blossoms and green fruit had no effect on cotton cater- 
pillars. 
The writers' results are given on page ±2. 
