THE FAMILIES AND GENERA OF THE BACTERIA 209 



Genus 1. Erythrobacillus, Fortineau 1905, p. 104 



Synonyms: Zaogalactina Sette 1824; Serratia Bizio, 1825; Bacillus, 

 in part, of many authors. 



Small aerobic bacteria, producing a red or pink pigment, usu- 

 ally a lipochrome. Gram stain variable. It is possible that 

 related yellow and orange chromogens should be included here 

 as well. 



Type species, Erythrobacillus prodigiosus (Ehrenberg) Com- 

 mittee. 



Genus 2. Chrome-bacterium Bergonzini 1881, p. 153 



Synonyms: The name was spelled Cromobacterium by Bergonzini and 

 corrected by Zimmerman 1881. 



Aerobic bacteria, producing a violet chromoparous pigment, 

 soluble in alcohol but not in chloroform. Motility and Gram 

 reaction variable. 



Type species, Chr. molaceum Bergonzini. 



Tribe 2. Erwineae, Nov. Trib. 



Plant pathogens. Growth usually whitish, often slimy. In- 

 dol generally not produced. Acid usually formed in certain car- 

 bohydrate media, but as a rule no gas. 



Genus 3. Erwinia Committee 1917d, p. 560. 



Characters those of the tribe. 



Type species, E. amylovora (Burrill 1883, p. 319; Trevisan 

 1889, p. 19) Committee 1917. 



Tribe 3. Zopfeae, Nov. Trib. 



Gram positive rods, growing freely on artificial media. Not 

 attacking carbohydrates. 



Genus 4. Zopfius, Wenner and Rettger, 1919, p. 334 



Synonyms: Bacterium Ehrenberg 1828 in part; Bacillus Cohn, 1872 

 in part ; Proteus Hauser 1885, in part. 



