TERAS TERMINALIS. 137 
‘as indicated in its trivial name, it is blister-like in its 
mode of expansion. Seldom more that two appear on 
a leaf. They may be on either side of the mid-rib, or 
coalescent; occasionally absorbing part of a small 
vein, but rarely, if ever, on the mid-rib. When on 
a lobe of the leaf distortion is sometimes produced 
similar to that caused by S. albipes. 
During many years of research I have on several 
occasions noticed galls on leaves of stub-oaks, very 
similar to S. vesicatriv. Small blisters, about 3 mm. 
in diameter; irregular periphery; when in nerve axils, 
triangular; without radii, grooves, or papille. Pale 
green, and greenish-yellow, broadly margined with 
red. The interior fully occupied with a pure white 
apodous larva, cecidomyian in shape, about 2 mm. 
long and ‘5 mm. at widest part. It eats its way out 
and falls to earth to pupate. Afterwards the supra 
convexity becomes concave. I have neither been able 
to have the larva identified, nor rear the imago. 
Teras terminalis, Fabricius. 
(Plates LVI, LVII.) 
Cynips quercus-terminalis, Fabri. ; Andricus terminalis, Fabri., 
Mayr, Walker, Fitch; Teras terminalis, Miller, Marshall, Adler ; 
Biorhiza terminalis, Cameron. 
English names of gall.—‘ The Oak Apple,” “King Charles’ 
Apple,” “The Apple Gall.” : 
Position of gall.— Axillary and terminal on twigs. 
Manner of growth. —Single, glabrous, glossy, globular, 
spongy. ; ; } 
Colours.—Yellowish-white, suffused with pink and red, pale 
brownish yellow. . : 
Average dimensions of a mature specimen.— Diameter, 
25 mm. 
May be sought during any month of the year. 
Growth is complete by the end of June. — 
The typical condition of the gall is plurilocular but unilarval. 
Usual number of cells about thirty. : 
The larve pupate in the gall. The imagines emerge during 
June and July. 
