194 



THE ENTOMOLOGIST. 



Fii?. 15. 



parasite of Biorhiza aptera ; that C. nobilis is a parasite of 

 Aphilothrix Sieboldi ; that C.Erucariim, C. abdominalis, and 

 C. regiiis, are parasites of Cynips cerricola ; that Megastignius 

 dorsalis is a parasite of Dryophanta macroptera and of 

 Andricus noduli ; and that Calliraorae amoenus, C. flavipes, 

 and Syntomaspis fastuosa, are parasites of Trigonaspis 

 megaptera. Synergus pallicornis associates with Cynips 

 Hartigi, S. pallidipennis with Cynips conitica, and S. thau- 

 macera with Trigonaspis megaptera. I mentioned T. megap- 

 tera and some of its parasites many years ago, when I 

 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. Cyii ips argentea. — Th i s 

 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 

 raillemetres 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 niillemetres. This 

 border is garnished with short 

 blunt points, and is generally less 

 Cynips aegentea (and iu section), than the greatest circumference 



