PHYLLOXERA QUERCUS. 49 



and therefore they can neither feed nor grow. The 

 female contains one single impregnated egg t of large 

 size. 



Through the liberality of M. Lichtenstein I am able 

 to add the following remarks which are the results 

 in series of his observation on this insect. 



1. The fundatrix or produce of the true egg. 



2. She gives rise to the winged form (Emigrante), 

 which lays her unfecundated eggs under the leaves of 

 Quercus pedunculata. 



3. These produce apterous insects (Gemmans), each of 

 which surrounds herself with concentric circles of eggs. 



4. These bodies develop apterous females (Pupiferce), 

 which carry four or five ovoid envelopes of different 

 sizes, one of which gives birth to the male, and the 

 other to the female sex. 



5. The apterous non-rostrated males and females 

 produce 



6. The fecundated egg ready to commence the new 

 cycle. 



M. Lichtenstein calls my attention to two small 

 lateral tubercles on each side of the females. I omitted 

 to notice these organs when I made my drawing. They 

 are characters to be noted, but they occur also in 

 Aphis papaveris, A. vibumi, A. Jacobosoe, &c, though 

 in these last insects the papillaa are more numerous. 

 Their economical significance is unknown. 



Phylloxera quercus, Boyer de Fonsc. PI. CXXIII. 

 figs. 1 — 10, Hartig, Lichtenstein, Riley. 



Apterous pseudo-female. 



This insect hatches in early spring from the egg 

 laid in Autumn. The egg is usually deposited in the 

 VOL. iv. 4 



