PHYLLOXERA PUNCTATA. 45 



scopic organisms with cholera, has his high reward in 

 the knowledge that he benefits his kind, and reduces 

 the world's misery. The observation that the dry 

 scientific fact of to-day may form part of the public 

 riches to-morrow, is somewhat trite. 



The genus Phylloxera was constructed by Boyer de 

 Fonscolombe in 1834,* to receive the then unique Aphis 

 Phylloxera quercus. The members of the group are 

 now somewhat numerous, but only two species can, 

 with certainty, be regarded as British. That on the 

 oak is plentiful in our southern counties during some 

 seasons. 



Phylloxera punctata, Licht. Plates CXXI, CXXII, 

 figs. i_6 ; and Plate CXXXI. 



Phylloxera quercus, Walk. 

 „ coccinea, Kalt. (?) 



M. Lichtenstein, in 1877, gave a short diagnosis of 

 an oak Phylloxera which he first found at Biarritz, and 

 to which he gave the name Phylloxera punctata. 



I append the substance of his remarks, as follows : — 

 " I found the foundress in May at Biarritz on Quercus 

 fastigiata. Her colour was white, irregularly spotted 

 with red globules, which appeared to consist of internal 

 granulations. She may be recognised by her long 

 antennae. She surrounds herself with her eggs dis- 

 posed in two concentric circles. I have not been able 

 closely to study this species; but it ought to be common 

 in the North, for I have seen it at Genthod, up in the 

 mountains at Geneva, and at Bagneres-de-Bigorre; 

 and Dr. V. Signoret showed it to me at Paris as being 

 the type of Phyl. coccinea, of Balbiani, Hayden, &c. 



" It is the palest in colour of all the Phylloxeras, in 

 all their forms, and its pupa? appear to me relatively 

 the largest. The sexated insects are whitish." 



I have repeatedly taken this Phylloxera on the oaks 



* ' Boy. de Fonsc, Ann. Soc. Ent. Fr.,' torn, iii, 223. 



