PHYLLOXERA PUNCTATA. 47 



large, but the number mucli diminishes in the following 

 generations. The eggs are at first quite smooth and 

 shining, but very shortly afterwards show a corrugated 

 appearance, which is caused by the extraordinarily 

 rapid development of their contents. In the course of 

 a few hours indeed the young Phi/lloxerce are disengaged 

 from their membranes, and then they are comparatively 

 active and stray away in search of nourishment. 



Phylloxera punctata infests the under sides of the 

 leaves of both varieties of the English oak. Some 

 years at Haslemere, at Wanstead, and at Southgate, 

 they are very numerous, but at other times I have 

 found much difficulty in securing even a few specimens. 

 The masses of pseudo-eggs appear as minute spots like 

 honey ; and it often happens that the larvae of a small 

 Scymnus or a minute Myina is employed in greedily 

 devouring them. 



Pupa. 



Long, oval, ferruginous yellow, which becomes 

 darker by age. Wing-cases brown; rostrum short. 

 The pupae change into the winged insects about early 

 June. The larvae undergo four moults before becom- 

 ing pupae (Licht.). 



Winged female. " Emigrante" 



Inch. Millimetres. 



Expanse of wings 0*170 4*31 



Size of body 0*070x0*030 177x076 



Length of antennas 0*010 0*25 



Head and thorax broad. Abdomen tapered to a 

 point, furnished with a blunt ovipositor. 



Thorax disproportionately large, brownish. Abdo- 

 men green, variegated with lighter spots, which show 

 the pseudova within. 



Antennae with three joints, the last imbricated and 

 the longest, furnished with a long, tubercular indenta- 

 tion covered by a membrane. 



