1911] 



Specific Characters in Pseudococcus 



317 



Citri Risso. Formula 6, 3, 2, 1, 5, (4, 6, 7) Newstead, 

 "British Coccidae" Vol. II. The specimens of this species 

 were taken from coleus in the Horticultural Forcing-houses of 

 Cornell University. No formula was found that agreed with 

 the one given by Newstead. In one specimen the formulae for 

 the right and left antennae were identical. The formulae of 

 the twenty antennae varied as much as the specifically diag- 

 nostic formulae published for all the species of Pseudococcus. 



Obscurus Essig. Formula S, 1, 3, 2, 4, 7, 5, 6. Essig, 

 "Pomona Jour. Ent." '09. The specimens of this species were 

 taken from an elder tree (Sambucus glauca) at Santa Paula, 

 California, and are from the lot of specimens that the type for 

 the species was taken. In one specimen the formulae of the 

 right and left antennae were identical. 



