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



species has not been found since its original collection, a valid redescription of 

 the genus was not possible for many years. However, a large number of species 

 of mealybugs on Gramineae, or on roots of other plants, or in ants' nests were 

 placed in the genus. Kiritchenko, 1936a : 130, sought to define the relation of 

 the genus to Trionymus Berg and Pseudococcus TVestwood, and determine dis- 

 tinctive characters permitting their separation. Proceeding from this point, 

 Goux, 1940: 55-62, completed the arbitrary redefinition of the genus, basing it 

 on characters of species grouped around tomlinii Xewstead, and erected three 

 new subgenera. Reyne, 1951a, after receiving remnants of the Signoret type 

 material from the Vienna Museum, presented an extended description and 

 discussion of the type-species based on a study of the preparations made from 

 this material. Unfortunately, the slide used by Signoret for his observations 

 has disappeared and the possibility exists that two species might have been 

 involved, since Reyne's preparation showed an 8-segmented antenna. 



Ripersiella Tinsley, 1899, Canad. Ent, 31 : 278. 



type-species : Riper sia rumicis Maskell, 1892, by subsequent designation of 

 Cockerell, 1901j. 



Cockerell, 1899m : 278, in a key, credited the name of the genus to Tinsley, 

 and later, 1901j : 165, further discussed the genus and designated the type-species. 

 A group of morphologically allied root-infesting species of mealybugs, closely 

 related to Rhizoecus Kiinckel d'Herculais, have been included under this name. 

 Hambleton, 1946 : 59-61, reviewed the genus and its relationships, transferred to 

 it five species from Rhizoecus and described eight new species. Ferris, 1953a : 

 426, and Williams, 1962 : 41, have not accepted the transfer of these species and 

 have reassigned them to Rhizoecus. 



Ritsemia Liechtenstein, 1879, Stettin. Ent, Ztg. 40: 387; 1879, [Paris] 

 Acad, des Sci. Compt. Rend. 88 : 870 ; 1879, Ann. and Mag. Nat. Hist. 

 (ser. 5) 3:455. 

 type-species : Ritsemia pupifera Lichtenstein, 1879. by monotypy. 



This genus and species have remained unplaced by present-day coccidologists. 

 On the basis of an opinion by Cockerell (in lit.), the species was assigned to the 

 genus Ripersia Signoret in the Fernald Catalogue, 1903b : 119. We have exam- 

 ined three mica preparations labeled Ritsemia pupifera, sent to Professor Corn- 

 stock by Lichtenstein in May 1882, and conclude therefrom that this is a valid 

 genus. 



Rizobius Passerini, 1863, Aphididae Italicae, p. 202. 

 A lapsus for Rhizooius Burmeister. 



Rolaspis Hall, 1946, Roy. Ent. Soc, London, Trans. 97 : 499, 531. 



type-species : Phenacaspis ivhitchilli Hall, 1946. by original designation. 



The author referred this genus to the Diaspidini and noted differences from 

 Phenacaspis Cooley and Cockerell, Tecaspis Hall and Voraspis Hall. Bala- 

 chowsky, 1954e : 357, assigned it to the Diaspidina, group II, chionaspiform. 

 Borchsenius and Williams, 1963, Brit. Mus. (Nat. Hist.) Ent. Bui. 13: 366, 

 confirmed its validity. 



