94 ANDEICUS AMBNTI. 



10. AndRIOUS AMBNTI. 



PI. VII, fig. 7. 



Andricus amenti, Giraud, Verh. z.-b. Ges. Wien, 1859, 360 ; 

 Mayr, Eichen gallen, 57, pi. vii, fig. 82 ; 

 Europ. Cyn., 14. 



Reddish-yellow; tlie mesosternum black, the antennse infuscated 

 towards the apex ; the vertex infuscated, finely shagreen ed, shining ; 

 mesonotum much more strongly and sharply shagreened ; mesopleurae 

 shining, impunctate; wings hyaline. $ and $. 



Length If mm. 



The agamic form is unknown. That it has one may 

 be taken for granted, but whether it is one of the 

 galls at present known merely in the agamic state or 

 some unknown form can only at present be con- 

 jectured. 



Gall. — Found in June on the <$ catkins. Length 

 about 2 mm. Cubital, rounded and narrowed at the 

 base, tapering gradually to the apex ; greenish when 

 fresh, brownish when old, covered sparsely with soft 

 pale hairs, the surface, when old, rough. As a rule 

 the galls are in clusters of three or four. Sometimes 

 the apex is nipple-shaped. 



The gall is very similar to that of pilosus, but gener- 

 ally the latter may be known by being somewhat 

 larger, not so globular, stouter, and not tapering so 

 much at the apex, which is, as a rule, nearly as broad 

 as at the base ; the hair is longer. 



No inquiline is known from it, but Giraud, its de- 

 scriber, gives Pteromalus dissectus, Wlk., P. Ratze- 

 burgi, Gir., and Olinx debilis, Gir., as parasites. 



In this country it is only known from Braemar, 

 where it was taken by Prof. Trail, and from Kew 

 (Rolfe). 



Continental distribution : Austria. 



