102 ANDEIOUS SOLITAEIUS. 



black ; antennae fuscous-black ; upper surface of abdomen blackish- 

 brown ; sometimes tbe head in part and streaks on the mesonotum 

 brownish ; legs reddish-yellow, tibiee brownish. Mesonotum alutaceous, 

 aciculate, a longitudinal furrow between the parapsidal furrows. 

 Length 3 mm. 



Gall. — This is an easily recognised gall from the 

 long white glistening hair with which it is covered, 

 and from the truncated apex with a nipple-like point 

 in the middle, the base being swollen. It issues from 

 the lateral buds ; is woody in texture ; the base when 

 fully developed is as wide as the gall is long ; the top 

 is narrowed, sometimes depressed ; and the nipple-like 

 point is glabrous and yellowish. The colour is green, 

 but more or less whitish from the long, silky, recurved, 

 glabrous hairs. The dilated basal region, when freely 

 developed, contains a cavity which is separated from 

 the upper larval chamber, which occupies the narrowed 

 upper region. When young or when the gall has been 

 distorted by inquilines the base is not dilated, and its 

 centre may be either hollow or filled up with a spongy 

 substance. 



Mr. Bignell has reared Synergus radiatus from the 

 galls. 



Of extensive range in this country, but not common. 

 Clydesdale, Lymm, Nottingham, Devonshire (Bignell). 



The insect emerges in the spring, and is probably 

 agamic. 



Continental distribution : Germany, Austria. 



17. Andeicus solitaeius. 

 PL VII, fig. 4 ; PL XV, fig. 3. 



Diplolepis solitarius, Fonsc, Ann. Sc. Nat., 1832, t. xxvi, 184. 

 Cynips ferruginea, Htg., Germs. Zeits., ii, 189; Sch., Nass. 



Cyn., 55, 62, 116, and 134. 

 Aphilothrix solitaria, Mayr, Eichengallen, 23, pi. iii, fig. 29 ; 



Fitch, Trans. Essex Club, ii, 136, 



fig. 24. 

 Andricus solitarius, Mayr, Europ. Cyn., 25. 



