NEUROTERUS NUMISMATIS. 137 



where the gall is being contracted or incised. Length 

 1 — 2 mm., more or less oval, usually with a point at 

 the apex ; yellowish-white, smooth, sometimes slightly 

 pilose. 



The imago escapes in June, and, like the other 

 Neuroteri, oviposits in the tender leaves. 



Apart from its position on the leaf, I am unable to 

 find any definite characters whereby the gall can be 

 known from those of Andricus nudus and A. gemmatus. 



Inquiline. — Synergus apicalis, Htg. 



Common and of wide distribution, but not nearly 

 so abundant as the common spangle gall (lenticularis). 



5. NEUROTERUS NUMISMATIS. 



PI. Ill, figs. 2 (numismatis) and 2 a (vesicatrix) ; 

 PI. XVI, figs. 3 (numismatis) and 3 a (vesicatrix). 



Cynips numismatis, Oliv., Enc. Meth., v, 787. 



Neuroterus Beaumuri, Htg., Germs. Zeit., ii, 192 ; Schenck, 

 Beitrage, 67. 

 — numismatis, Mayr, Eichengallen, 44, pi. vi, fig. 62 



Europ. Cyn., 39; Adler, D. E. Z 

 xxi, 232 ; Z. wiss. Zool., 1880, 163 

 pi. x, fig. 3; Licht., Cyn., 16, pi. i 

 fig. 3. 



Spathegaster vesicatrix, Schlecht., T B. Yer. Zwickau, 1871, 33 

 S. E. Z., 1870, 387 ; Mayr, Eichen 

 gallen, 51, pi. vi, fig. 74 ; Europ 

 Cyn., 39; Adler, 1. c, 163, pi. x 

 fig. 3 a ; Licht., Cyn., pi. ii, fig. 3 a. 



Agamic Form. — Black ; antennse brown isli-black, somewhat lighter 

 at the base ; legs brownish, brownish-yellow, or fuscous. Wings hyaline, 

 a brownish spot at the base of the first cubital cellule. Mesonotum 

 shining, especially in the centre ; very finely aciculated ; scutellum 

 shagreened. 



Length 2 — 2g mm. 



Gall. — Round, averaging 2 mm. in diameter, a large 

 circular depression in the centre, the depression being 

 wider than the sides ; bare and reddish, the sides 

 closely covered with golden, depressed, silky hairs. 

 Found on the under side of the leaf, generally in 

 numbers. 



