THE ENTOMOLOGIST. 



No. 131.] 



JULY, MDCCCLXXIV. 



[Price 6d. 



FiK. 10. 



Descriptions of Oak-galls. Translated from Dr. G. L. Mayr's 

 'Die Milteleuropiiischen Eichengalleu' by Mrs. Hubert 

 Herkomer n^e Weise. 



III. Bud-galls. 



(On twigs that are two years old or more, or on the trunks.) 

 Cynips Hartigi. — This beautifully- 

 shaped gall is developed from grow- 

 ing buds on the branches and stem 

 of Quercus sessiliflora, chiefly on 

 their under side: it appears as a half 

 or three-quarter sphere of three centi- 

 metres in diameter ; it is of a dark 

 brown colour, tinged with bluish 

 white ; it has numerous short conical 

 projections, and is firmly attached to 

 the branch at the base by a very short 

 foot-stalk. On detaching this gall 

 from the twig the bud-scales are 

 always found. A section of this gall 

 exhibits in the centre a hard, white, 

 spherical, inner gall, about the size 

 of a pea, which is attached to the 

 twig by a short foot-stalk ; it always 

 contains a single larva-cell ; an exte- 

 rior surface is covered with many 

 small rugosities and shallow furrows; 

 from each of the little excrescences 

 issues a brown (at first green) stalk, 

 about one millemetre in diameter, and 

 from three to four millemetres in 

 length ; this stalk gradually thickens 



VOL. VII. 



Cv.NiPs Hartigi. 



