THE ENTOMOLOGIST. Ns 
diameter at the base is about the same, but is sometimes 
narrower than this, and sometimes even broader; from 
the base to the apex it is thickly and coarsely striped or 
furrowed, and its surface is smooth. Single galls, or 
those not very crowded, are perceptible on the outside on 
short or uneven space of the bark, which latter, however, can 
only be regarded as a ring, for the base of the gall penetrates 
farther into the bark than the periphery, so that half of the 
spacious larva-cell is below the circumference of the cone. 
The substance of the gall is composed of two thinnish layers: 
the outer one, of a reddish colour, is doubtless full of sap ; 
while the inner, which is yellowish, is hard and sharply 
furrowed, from the circumference of the cone to the apex, in 
a way that makes the furrows appear deeper at the circum- 
ference than nearer the apex; the striz, or the outer layer, 
unquestionably result from its adhering so closely to the 
grooves and furrows of the inner layer during the slow process 
of drying. In old galls the outer layer is generally cracked, 
and we then only see the brownish yellow inner layer. In 
this condition the deeper furrows round the periphery of the 
cone appears as dots; the aperture through which the imago 
makes its escape is on the side, and above the periphery of 
the cone. 
M. von Siebold has been so kind as to send me typical 
specimens, found at Dantzig and Friebourg on Quercus 
sessiliflora, and from these it appears that Professor Schenck 
considers this gall to be that of Cynips corticalis of Hartig. 
Now, as Hartig’s description of Corticalis is such that one 
cannot distinguish it from A. Sieboldii; and, moreover, as 
Hartig doubtless applies the reference to “Malpighi (op. 
omn. tab. 17, fig. 60”), although the figure of the gall repre- 
sents that of A. Sieboldii, 1 think it very probable that 
C. corticalis and C. Sieboldii are synonyms of the same 
species, and that Hartig, when describing his Corticalis, had 
only ill-preserved specimens at his disposal. 1 therefore feel 
justified in retaining the later name, since under that name 
the gall is minutely described, and typical specimens have 
been submitted to me for examination.—G. L. Mayr. 
Synergus incrassatus inhabits this gall.—F. Walker. 
I think it will be impossible for an entomologist to 
examine attentively the beautiful figures of the bark-galls, 
