78 ANDRICUS FECUNDATRIX. 



dish spots are absent. The basal membranes remain 

 attached to the midrib, but the galls fall to the earth 

 before the larvae are grown. 



The galls become ripe in October, the flies issuing 

 from them in that month except on rare occasions, 

 when they remain undeveloped until the following 

 year. As a rule the galls are attached to the leaves 

 about three weeks, their resting-places on the midrib 

 being indicated by the basal membranes. 



The species is readily known by the bulging curved 

 keels on the median segment. The antennas and the 

 wings too are longer than usual, and the former are 

 thinner, shaped more like those of Neuroterus than of 

 typical Andricus. Synergus Tscheki and S. tristis are 

 the inquilines. Giraud records Pteromalus bisignatus, 

 GKr., as a parasite. Eurytoma rosse is another. Adler 

 observed ostreus lay its eggs in the leaf -buds in Octo- 

 ber, but it also appears in March. 



2. Keels on the median segment straight and parallel. 



3. Andricus fecund atrix. 



PI. Ill, figs. 3 and 3 a (fecundatrix, pilosus), gall; 

 PI. XIV, figs. 1 and la (fecundatrix, pilosus). 



Cynips gemmse, Lin. Fn. Sv., 1525. 



— fecundatrix, Htg., Germs. Zeits., iii, 325. 



— gemmse, Schenck, Nass. Cyn., 54, 57, 113, and 134. 

 Aphilothrix gemmse, Mayr, Eichengallen, 23, pi. iii, fig. 28 ; 



Fitch, Essex Field Club, ii, 136. 

 — fecundatrix, Adler, Zeits. wiss. Zool., xxxv, pi. x, 



fig. 10; Licht. Cyn., 37, pi. i, fig. 10. 

 Andricus fecundatrix, Mayr, Europ. Oyn., 23. 



— pilosus, Adler, Zeits. wiss. Zool., xxxv, 180, pi. x, 



fig. 10 a; Licht., Oyn., 40, pi. i, 

 fig. 10 a ; Mayr, Europ. Oyn., 19. 



Agamic Form. — Black or fuscous-black ; the abdomen with a brownish 

 tint, reddish at base and apex, paler at the sides ; the legs brownish- 

 black ; the knees and anterior legs in front brownish-red ; the fore-tibiae 

 strongly and thickly covered with erect hairs ; the middle of the vertex 



