194 THE ENTOMOLOGIST. 
parasite of Biorhiza aptera; that C. nobilis is a parasite of 
Aphilothrix Sieboldi; that C. Erucarum, C. abdominalis, and 
C. regius, are parasites of Cynips cerricola; that Megastigmus 
dorsalis is a parasite of Dryophanta macroptera and of 
Andricus noduli; and that Callimome ameenus, C. flavipes, 
and Syntomaspis fastuosa, are parasites of Trigonaspis 
megaptera. Synergus pallicornis associates with Cynips 
Hartigi, S. pallidipennis with Cynips conifica, and S. thau- 
macera with Trigonaspis megaptera. I mentioned T. megap- 
tera and some of its parasites many years ago, when [ 
observed the gall on oak trunks, near London; and I saw it 
again this year in May, near Lanark: it was mostly near the 
ground, and in no case above the height of six feet. In the 
beginning of June thirty-six males and females of T. megaptera 
appeared, and towards the end 
of this month they were followed 
by five or six females of Syner- 
gus thaumacera.—F. Walker. 
Developed on the young shoots, out of 
terminal or axillar buds. 
15. Cynips argentea.—This 
large, beautiful gall is found in 
the axils of Quercus pubescens 
(very rarely in those of Q. sessi- 
liflora), in the country round 
Vienna. It is seldom met with 
there, but occurs more fre- 
quently in. Southern Europe. 
It is spherical in shape, and 
measures seventeen to thirty 
millemetres in diameter. Around 
the short-conical, blunt and 
bossed tip, which is exactly 
opposite the basal attachment, 
there is a border or crown, 
from which the parallel radius 
to the middle of the gall measures 
ten to fifteen millemetres. This 
border is garnished with short 
blunt points, and is generally less 
Cynirs ARGENTEA (and in section). than the greatest circumference 
