l66 THE OAK GALLS AND GALL INSECTS 



all cases being very much distorted and swollen. This swelling- 

 commenced about the beginning of Ma}'. The galls themselves 

 began to appear at the beginning of June and continued until the 

 end of August, as I found some fresh galls on the 22nd of the 

 latter month. Cameron mentions this species as occurring in 

 IMugdoch Wood and I have also taken it in Kent, but 1 have 

 not heard of it from any other locality. 



(23.) Agamic Form. XIII. Andricus quadrilineatus 

 (Htg.) 



Inquiline. Synergus facialis (Htg.). 

 Gall. 



Oval in shape, somewhat flattened at the ends. They maybe 

 smooth, but are usually furrowed. Colour varies between green,. 



yellow, and red. They are found on the flowering catkin. 



Imago. 



Very variable. Colour: Usually brownish red. Atiteniiae : Dark, infuscated,. 

 or nearly black. Thorax : Two lines on the median lobe of the mesonotum and 

 one on the laterai and scutellae foveae, black. A short whitish pubescence is 

 present ou the pleurae and median segment. Scutellum finely rugulose. 

 Abdomen : Dark brown above. -Legs : Brownish yellow, coxse, bases of femora 

 and outer margin of tibias, dark. IVings : Hyaline, nervures dark brownish.. 

 Cubitus and base of radial cellule, very slightly infuscated. 



The A quadriUneatus galls appear in May. The flies emerge 

 in the following April. They prick the buds of the male catkin 

 about the middle of April, and the galls are mature at the 

 beginning of June. In a great many cases the flies do not emerge 

 until April of the second year. 



OCCURRENCE IN EPPING FOREST. 

 Very abundant. These galls occur in numbers on th& 

 catkins. First appearance noted, May i8th. 



(24.) Agamic Form. XIV. Andricus albopunctata 

 (Schtdl). 



Inquilines. Synergus radiatus (Htg.) and S. facialis (Mayr). 



Gall. 



Grows from a bud, varying a great deal in colour from green 

 to reddish brown, usually marked with light longitudinal spots^ 

 In many cases these galls greatly resemble buds; in others, 

 where the gall grows much larger, they are somewhat similar to 

 acorns without the cup. They vary in shape, but as a rule: 

 become narrower towards the apex. 



