176 PSEUDOCOCCUS. 



G-EXUS PSEUDOCOCCUS (Signoret). 

 (PI. C, fig. 1, Vol. I; PL LXIII, figs. 1-9.) 



Adult females differing only from those of Dacty- 

 lopius in possessing nine- jointed antennae. 



Males with four caudal filaments. 



Larvae closely resembling those of Dactylopius. 



In the only known British species the relative length 

 of the antenna! joints in the adult female is decidedly 

 variable. It was chiefly this which led Mr. Douglas 

 and myself to erect the species hereafter placed as 

 synonyms of P. aceris, Sign. 



In the majority of species the ovisac (PI. C, fig. 1, 

 Vol. I) is very elongated, and composed of white felted 

 or flocculent secretion in which the female completely 

 envelopes itself at the period of parturition. Before 

 the period of the formation of the ovisac the females 

 are decidedly active, and the British species is of a 

 wandering disposition. 



PSEUDOCOCCUS ACEEIS (Signoret). 

 (PI. C, fig. 1, Vol. I ; PI. LXIII, figs. 1-9.) 



Pseudococcus aceris, Signoret ; Essai, p. 363. 

 ? Pseudococcus cesculi, Signoret; Essai, p. 364. 

 ? Pseudococcus brunnitarsus, Signoret; Essai, p. 366. 

 ? Pseudococcus mespili, Signoret ; Essai, p. 367. 

 Pseudococcus ulicis, Douglas; Ent. Mo. Mag., vol. 



xxv, p. 88, figs. 1, 2 (1888). 

 Pseudococcus ulmi, Douglas ; Ent. Mo. Mag., vol. 



xxv, p. 124, figs. 1, 2 (1888). 

 Pseudococcus aceris (Sign.), Douglas; Ent. Mo. Mag., 



s.s., vol. i, p. 151 (with fig.) (1890). 

 Pseudococcus guercus, Douglas ; Ent. Mo. Mag., s.s., 



vol. i, p. 154, figs. 1-3 (1890). 



