30 BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 



Caryophyllus aromaticus L. Myrtaceae. Synonym: Eugenia aromatica Baill. 

 Clovetree. Tropical regions. 



Scott, Abbott, and Dudley (83, p. 13, 34) found powdered cloves 

 ineffective against roaches, but efficient against the larvse 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 (83, p. 13) found Cassia (species not 

 given) ineffective against roaches. 



Cassia stipulacea Ait. Chili. 



Greshoff (31, 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 (4-0, 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. lift) says that the decoction is used in West Africa 

 as an insecticide. 



Cereus sp. Cactaceae. Cactus. 



Howard (44, P- 74) says that cactus leaves, made into a sticky 

 paste and spread over the surface of the water, kill the larvse 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. Papavekaceae. Swallow-wort. 



Goriainov (29) determined that a decoction killed 4 per cent of 

 the larvse of Malacosoma neustria and 44 per cent of the Vanessa 

 urticae tested. 



Chenopodium ambrosioides L. Chenopodiaceae. Synonyms : C. antJielminti- 

 cum L.. C. ambrosioides aiithelminticuni A. Gray. American wormseed. 

 Tropical America, naturalized in the United States. 



Riley (71, p., 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 22. 



