142 THE COCCIDAE 



Mexico. These species can be separated by the following table prepared 

 by Parrott. It should be noted that the American species will not run 

 to Gymnococcus in the table to the genera of Eriococcinae. 



SPECIES OF GYMNOCOCCUS 

 a. Cuticle of adult female with numerous short conical setae. — Europe 



on Agave. agavium Dougl. 



aa. Cuticle of adult female not bearing conical setae. 



b. Thoracic spiracles with cerores forming complete ring about 



them. — New Mexico on grass. ruber Parr. & Ckll. 



bb. Thoracic spiracles with cerores limited to one side, not forming 

 complete ring about spiracle. — Kansas on grass nativus Parr. 



Geococcus Green. — A single species, radicum Green from Ceylon 

 upon the roots of grass, is included. 



Porococcus Ckll. — There are two species from Mexico included, 

 occurring on mistletoe on oak; pergandei Ckll. and tinctorius Ckll. 



Coccura Sulc. — A genus erected for Phenacoccus comari Kvinow 

 from Germany on Comarum by Sulc. Ferris believes that the American 

 Phenacoccus stachyos Ehrh. is congeneric. 



Macrocerococcus Leon. — This genus includes a single species, 

 superbus Leon, from Italy, Corsica, and France on Lepidum, Alyssum, 

 lotus, Fumaria, Cetarach, Antirrhinum, and undetermined grass. 



Macrocepicoccus Morr. — A single species, loranthi Morr., the type 

 of the genus, described from British Guiana. The cerari consist of a 

 chitinized area bearing from one to four ceraran setae. 



Tetrura Licht. — This genus is omitted from the table. The 

 description of the genus and species is too indefinite to permit of its 

 location. It would run to Phenacoccus by the table. There is a single 

 species, rubi Licht. from Europe on Rubus. 



Heliococcus Sulc. — A single species included, bohemicus Sulc 

 from Bohemia and Moravia on Robinia. 



Phenacoccus Ckll. — There are thirty-four species referred to this 

 genus in Fernald's Catalogue. Of this number sixteen are recorded from 

 America, some of these have since the publication of the Catalogue been 

 referred to the synonomy. The following species, other than those in- 

 cluded in the table, should be noted. They are: americanae King & 

 Ckll. from Massachusetts from the nests of Lasius; cevalliae ClcU. from 

 New Mexico on Cevallia; cockerelli King from Colorado on Amelanchier; 

 gossypii Towns. & Ckll. from Mexico on cotton, other Malvaceae, wild 

 guava; minimus Tins, from Colorado on Picea; rubivorum Ckll. from 

 New Mexico on Rubus; ripersioides W. & T. Ckll. from New Mexico from 

 nests of Lasius; simplex King from California on Atriplex; solenopsis 

 Tins, from New Mexico from nests of Solenopsis; spiniferus Hemp, from 

 Brazil; and wilmattae Ckll. from New Mexico on Viola. 



SPECIES OF PHENACOCCUS. 

 a. Body with many short, stout, cylindrical ducts. — California on 



lichens on Picea. kuicanae Coleman. 



aa. Body not with many short, stout, cylindrical ducts, 

 b. Anal cerari with only two ceraran setae. 



