ON THE COMMON OAK 165 



Hymen- On buds on the bark of the lower part of the trunk, 

 optera and on small twigs and branches growing therefrom. 

 Gall rounded, 5 to 7 mm. in diameter, with a minute apical 

 point ; surface smooth and shining, white, becoming a 

 beautiful reddish-pink, soft and juicy within. There is 

 no internal gall. Imago, May and June, I. These galls 

 are usually gregarious. 



Trigonaspis megaptera Panzer 240 

 Syli. Trigonaspis crustalis Hartig. 

 Connold, Oak Galls, pis. 58, 69 ; Plant Galls, figs. 168, 

 175. Houard, No. 1280. Adler and .Straton, Alternating 

 Generations, pi. 2, fig. 18a. 



„ On the lower surface of the leaf, attached to a vein by a 



short slender stalk ; gall kidney-shaped, average length 

 3 mm., at first pale green or yellowish, becoming" more or 

 less tinted with red. Imago, spring. III. 



Trigonaspis megaptera, form renum 241 



Syn. Trigonaspis renum Giraud ; Biorrhiza renujn 

 Hartig. 



Connold, Oak Galls, pi. 34 ; Plant Galls, fig. 199. 

 Houard, No. 1343. Adler and Straton, Alternating 

 Generations, pi. 2, fig. i8. 



, , Gall formed at the extremity of the terminal part of a 



lateral leaf-vein, the growth of which is arrested, and the 

 leaf in consequence is often segmented to the midrib at 

 that part. The gall is minute (2 mm. long), softj fleshy, 

 and yellowish-white. Imago, May, I. (Plate V. 8, d.) 



Neuroterus ALBIPES Schrenck 242 ' 



Syn. Spathegaster albipes Schr. 



Connold, Oak Galls, pi. 51 ; Plant Galls, fig. 214. 

 Houard, No. 1346. Adler and Straton, Alternating 

 Generations, pi. i, fig. 2a. 



,, On the lower surface of the leaf, and attached to it by a 



small point, a rounded gall, 3 to 5 mm, in diameter, plane 

 or concave, whitish or brownish on its lower surface, with 

 minute central umbo on the upper, which is dull red or 

 veined with red. The gall is either quiteglabrous at maturity, 

 or has a few short hairs on the margin of the upper sur- 

 face. Usually gregarious. Imago, March, II. (Plate V. p.yi) 



' Neuroterus albipes, form laeviusculus 243 



Syn. Neuroterus laeviusculus Schrenck. 



Connold, Oak Galls, pi. 47 ; Plant Galls, fig. 208. 

 Houard, No. 1332. Adler and Straton, Alternating 

 Generations, pi, i, fig. 2. 



On the male catkin, a rounded gall about 5 mm. in 

 diameter, juicy, reddish, when numerous causing the 



