NEUROTERUS LJIVIUSOULIS. 135 



The antennge are often brownish towards the apex ; 

 the amount of yellow at the base of abdomen varies ; 

 the apex, too, may be yellowish, and the ovipositor is 

 testaceous. 



Gall.^-Fo\md in June and July on the under side of 

 the leaves or on the leaf peduncle; small, roundish, 

 whitish or pale yellow, covered with long, glistening, 

 white hairs, which fall off at maturity ; generally many 

 occur on one leaf. Diameter 3 mm. 



It is a later species than baccariim, the flies not 

 making their appearance before the middle of July. 

 The gall, as well as that of fumipennis, is found on 

 young shrubs or on the twigs growing at the foot of 

 old oaks. With age the galls become bare, in which 

 state they can hardly be known from those of bac- 

 carum. The central cavity is, however, longer in tri- 

 color. 



Inquilines. — Synergus albipes, Htg., S. facialis, Htg., 

 and 8. thaumacera, Dalm., all in June and July of the 

 same year. 



Parasites. — Eurytoma rosse ; and Mr. Rothera (Ent., 

 x, 235) bred a Torymus and a Pteromalus from them. 



Widely distributed in Europe. 



4. Neuroterus l^viusculis. 

 PI. I, figs. 2 (albipes) and 2 a (Iseviusculis). 



Neuroterus Iseviusculis, Schenck, Beitrage, 70 ; Mayr, Eichen- 

 gallen, 46, pi. vi, fig. 65 ; Europ. Cyn., 

 38 ; Adler, B. E. Z., xxi, 232 ; Z. wiss. 

 Zool., 1880, 161, pi. x,fig. 2; Licht., 

 Cyn., 14, pi. i, fig. 2. 

 — pezizeeformis, Schlecht., S. E. Z., 1870, 384. 

 Spathegaster albipes, Schenck, Beitrage, 85 ; Mayr, Eienen- 

 gallen, 50, pi. vi, fig. 72 ; Europ. Cyn., 

 39 ; Adler, B. E. Z., xxi, 232 ; Z. wiss. 

 Zool., 1880, 162, pi. x. fig. 2 a ; Licbt., 

 Cyn., 15, pi. ii, fig. 2 a. 



Agamic Form. — Black ; legs brownish or brownish-black, the apices 

 of all the joints yellow, and sometimes more or less of the anterior 

 tibise. Antennae brownish-black, sometimes with the basal two joints 

 yellowish beneath, the last two joints indistinctly separated. Head 



