174 MISC. PUBLICATION 1015, U.S. DEPT. OF AGRICULTURE 



Rhizobius Burmeister, 1835, Handb. cler Ent. 2 (abt. 1) : 87. 



type-species : Rhizobius pilosellae Burmeister, 1835, by monotypy. 



This genus was included in the list of aphid genera under the heading, "Aphis 

 aut. Coccus Leon Duf.", followed by a description of the single included species 

 and comment on its similarity to Coccus zeae maidis Dufour. There has been 

 uncertainty as to the identity of the type-species. Lindinger considered it a 

 coccid. However, workers in the Aphididae place the genus and species in that 

 family. 



Rhizobius Buckton, 1883, Monograph of the British Aphides 4: 181. 



type-species : Rhizobius jujubae Buckton, 1883, by monotypy. 



This name was preoccupied by Rhizobius Burmeister, 1835 (Aphididae), and 

 Rhizobius Agassiz, 1846 (emendation of Rhyzobius Stephens, 1829, Coleoptera). 

 Rhizobius jujubae Buckton is a Drosicha Walker or something closely related. 

 See Morrison, 1952 : 76, for details, 



Rhizococcus Signoret, 1875, Soc. Ent. de France Ann. (ser. 5) 5 : 16, 

 36. 



type-species : Rhizococcus gnidii Signoret, 1875, by monotypy. 



The author presented this genus as very close to Eriococcus Targioni-Tozzetti 

 and Acanthococcus Signoret in microscopic characters, but differentiated by 

 habitat. Coccid workers have held varying views as to its status. Lindinger, 

 1933a : 107, considered the name of a synonym of Nidularia [of Lindinger, 

 = Eriococcus auct.]. Ferris, 1955a: 94, and 1957c: 85, believing that the genus 

 had been based on an immature insect, also considered the name a synonym of 

 Eriococcus auct. Borchsenius, 1948 : 501, and 1949 : 351, maintained the validity 

 of the genus and transferred to it a number of species formerly assigned to 

 Eriococcus Targioni-Tozzetti. Danzig, 1962a : 839, accepted this interpretation 

 and presented a revision with recharacterization of the genus, redescriptions of 

 several species, and a key for differentiation of the species. Hoy, 1963, New 

 Zeal. Dept. Sci. and Indus. Res. Bui. 150 : 8, regarded Rhizococcus as a synonym 

 of Eriococcus Targioni-Tozzetti. 



Rhizoecus Kiinckel d'Herculais, 1878, Soc. Ent. de France Ann. (ser. 

 5) 8:163. 



type-species : Rhizoecus falcifer Kiinckel d'Herculais, 1878, by monotypy. 



The author established this genus for a root-infesting mealybug. Hambleton, 

 1946, reviewed it and related genera and added four new genera to the lour 

 already described in the group. 



Rhizopulvinaria Borchsenius, 1952, Acad. Nank SSSR Zool. Inst. 

 Trudy 12 : 207, 301-303. 



type-species: Rhizopulvinaria rinjulatu Borchsenius, 1952, by original 

 designation. 



The author placed (his genus in the Pulvinariini. Coccinae. 



