181 



Coccohacillus cajae is motile, gram- negative , and shows 

 "bi -polar staining. Unlike Coccohacillus acridiorum , it is 

 a parasite of the "blood of the caterpillar and not of the 

 digestive tube. When caterpillars are given "by ingestion 

 a f ev drops of a culture "by means of a pipette introduced 

 into the pharynx, they die after a few hours from a septi- 

 cemia. 



Besides the larvae of Arctia caja , Pi card and Blanc 

 (19131)) found Coccohacillus cajae to "be pathogenic to the 

 following insects: Coleoptera: Poecilus koyi , Opatrum 

 sahulosum , Cetonia aurata , Melolontha vulgaris , Anoxis 

 austral is , Chrysomela sanguinolenta , Cleonus mendicus ; 

 Hemiptera: Eurydema ornata ; Orthoptera: Per ip lane ta 

 orientalis , Epacromia strep ens , Acridium aegyptium ; Lepi- 

 doptera: Porthesia chrysorrhoea , and Bombyx mori . Accord- 

 ing to Picard and Blanc, this list could probably "be ex- 

 tended indefinitely since it is probable that the majority 

 of insects are killed "by Coccobacillus cajae . It is 

 interesting to note, 'however, that the aquatic "beetles are 

 among those which are immune: Coleoptera: Hydrophilus , 

 Dystiscus , Cybister ; Hemiptera: No tone eta , Nepa , and 

 Ranatra . While the whfte rat is immune, the tree frog, 

 Syla arborea , dies of septicemia in about two days, its 

 "blood containing numerous Coccobacilli . 



Various workers have referred to this "bacterium as 

 " Bacillus cajae " (Marchal, I91U; Picard, 191^; Paillot, 

 1933). 



Marchall, P. 191^ Rapport phytopathologique pour l'annie 



1913. Rev. Phytopath. App. , Nos. 18-19, pp. 9-13- 

 Paillot, A. 1933 L' infectious chez les paris insectes, 



533 PP« Imprimerie de Trevoux. , (see page 125). 

 *Picard, F. , and Blanc, G. R. 1913 a Sur une septicemie 



"bacillaire des chenilles d' Arctia caja , L. Compt. rend. 



acad. sci., 156, 133^-1336. 

 Picard, F. , and Blanc, G. R. 1915b Les infections a 



coccobacilles chez les insectes. Compt. rend. hebd. 



acad. sci., 157, 79-81. 

 Picard, F. 7 and Blanc, G. R. 191^ Les Chelonies on 



Chenilles "baurrues. progres Agric. Vitic. , 31> 261-266. 



COCCOBAC I LLUS ELL I NGER I Metalnikov and Chorine 

 (See also Escherichia ellingeri . ) 



Insects concerned: The European corn "borer, Pyrausta 

 nubilalis; the "bee moth, Galleria mellonella ; and Cera - 

 titis capitata . 



