Spathegaster verrucosus. 69 



about fourteen days and pricked a series of buds during 

 this time. After their death I took the oak out of 

 doors for the winter, but next year in the beginning 

 of May, when the buds began to shoot, I brought 

 it indoors again for more convenient observation. 

 When the leaves unfolded, dainty little galls appeared 

 upon them, five in all, besides one which grew 

 directly out of a bud. This gall, produced by Dryo- 

 phanta divisa, is that of Spathegaster verrucosus. 



[The scarlet pea gall is found in June on Qiiercits pediinctdata. 



Inquilines. Synergns pallicornis, in April of the second year; 

 S. Tscheki, in March of the second year ; and S. albipcs, in August of 

 the same year. 



Parasites. Syntomaspis cyanea, in spring of the second year ; 

 S. lazulina, Torymus abdoininalis, T. pubescens. T. regiiis, Pteronialus 

 Saxesenii, P.fasciculata, all in autumn of the same year ; P. incrassatus, 

 in May of second year; Eurytoma sqttamea, E. sctigera, E. signata, 

 E. rosae, Decatoma biguttaia, Eupelmus iirozonus.~\ 



16^ Spathegaster verrucosus. Schltdl. ^ 



Gall. About 4 mm. long; oval in form, with broad 

 rounded point ; of a greenish yellow or somewhat 

 reddish colour ; with a peculiar granular but rather 

 glossy rind, caused by the peripheral cells bearing, 

 instead of hairs, small round bladders filled with a clear 

 fluid, probably a protection against parasites. The 

 situation of the galls is peculiar because they grow 

 sometimes on the leaves, sometimes on the shoots, and 

 sometimes from the buds ; this is due to the fact that 

 although as mentioned above the eg^ of Dryophanta 

 divisa is usually laid on the rudimentary leaves, yet 



[ ^ Dryophanta divisa, sexual form, Cameron. Dryophanta verrucosa, 

 Mayr.] 



