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



150: 15, placed the genus in the Eriococcidae on the basis of the published 

 description. Trichococcus Borchsenius is a homonyn of Trichococcus Kanda. 



Trichomytilus Leonardi, 1898, Riv. di Patol. Veg. (1897) 6: 45-16. 



type-species : Mytilaspis formosa Maskell, 1893, by monotypy. 



Morrison and Morrison, 1922: 106, considered that this genus should be in- 

 cluded in the Chionaspis Signoret series rather than the Lepidosaphes Shinier 

 group. Ferris, 1941a : 12, accepted the genus as valid. 



Tridisculus Ferris, 1950, Atlas of the Scale Insects of North America 

 (ser. 5) [v. 5] : 13. 



A lapsus for Tridiscus Ferris. 



Tridiscus Ferris, 1950, Atlas of the Scale Insects of North America 

 (ser. 5) [v. 5]: 21, 248. 



type-species : Trionymus distichlii Ferris, 1918, by original designation. 



The author placed this genus in the Pseudococcidae, distinct from Trionymus 

 Berg. McKenzie, 1960: 692, and 1962: 640, 686, accepted it as a valid genus. 



Trigonaspis Ferris, 1941, Atlas of the Scale Insects of North Amer- 

 ica (ser. 3) [v. 3] : SIII-321. 



type-species : Trigonaspis inclusa Ferris, 1941, by original designation. 



The author placed this genus in the Pseudoparlatoria Cockerell group of the 

 Diaspidini, Diaspidinae and, 1942: SIV-423. substituted the name Vinctrtaspis 

 because of prior use of Trigonaspis in Hymenoptera (1840), in Trilobita (1S49) 

 and in Coleoptera (1924). Lindinger. 1957: 552, transferred seven of the in- 

 cluded species, but not the type-species, to Cryptaspidus Lindinger. This action 

 has not been confirmed by other workers. 



Trimerococcus Balachowsky, 1952, Soc. d'Hist. Nat. de l'Afrique du 

 Nord,Bul.43(8-9):177. 



type-species : Trimerococcus icosianus Balachowsky. 1952, by original desig- 

 nation and monotypy. 



The author placed this genus in the Phenacoccus group of the Pseudococcidae. 

 related to Phenacoccus Cockerell and Puto Signoret. 



Trionymus Berg, 1899, Mus. Nac. de Buenos Aires Comun. 1 : 78. 



type-species : Westicoodia perrisii Signoret, 1875, by substitution of Triony- 

 mus for Westwoodia Signoret. 



The author proposed this name as a substitute for Signorctia Kraatz. 18SS. 

 preoccupied, which had been proposed earlier as a substitute for Westwoodia 

 Signoret, 1875, preoccupied. It is currently accepted as the valid name for this 

 unit. See under Westwoodia for details. 



