ON THE COMMON OAK 
161 
sion, which keeps the green tint when the rest of the gall 
has become reddish-brown. Appearing in summer; 
mature in October, when it falls to the ground. Imago, 
spring, III. 
ANDRICUS CURVATOR, form COLLAR IS 223 
Syn. Andricus collaris Hartig; Aphilothrix collaris 
Adler. 
Connold, Oak Galls, fig. 8 ; Plant Galls, fig. 185. 
Houard, No. 1216. Adler and Straton, Alternating 
Generations, pi. 1, fig. 9. 
Hymen- In the axillary and terminal buds. Gall very minute, 
optera ovoid, 2 mm. long, green, becoming brown, smooth and 
shining. Appearing in May. Imago, July or August, I. 
Andricus gemmatus Adler 224 
Connold, Oak Galls, pi. 5 ; Plant Galls, fig. 177. 
Houard, No. 1297. Adler and Straton, Alternating 
Generations, pi. 1, fig. 7a. 
»» In the bark at the base of the trunk, gregarious woody 
galls, each covered with a conical operculum, fleshy and 
red at first, which falls off at maturity, when the gall re¬ 
sembles a minute cone with its point buried in the bark, 
its base (3 to 4 mm. in diameter) slightly exposed. Around 
the edge of the base are a series of little punctiform de¬ 
pressions ; in its centre a rounded smooth swelling, within 
which is the larval cavity. Imago, April or May, II. 
Andricus gemmatus, form corticis 225 
Syn. Aphilothrix corticis Linn. A ndricus corticis Mayr. 
Connold, Oak Galls, pis. 19, 20 a ; Plant Galls, fig. 166. 
Houard, No. 1291. Adler and Straton, Alternating 
Generations, pi. 1, fig. 7. 
,, Terminal buds of a twig remaining short and thickened, 
causing a thick swelling (12 mm. by 7 mm.), bearing some¬ 
what tufted leaves. The central cavity contains an internal 
gall firmly fixed to the bottom; lateral twigs often grow from 
the gall after the insect has emerged. Imago, June, I. 
Andricus inflator Hartig 226 
Connold, Oak Galls, pi. 11; Plant Galls, fig. 170. 
Houard, No. 1205. Adler and Straton, Alternating 
Generations, pi. 1, fig. 8 a. 
,, In a bud. Gall solitary, green, glabrous, 3 to 5 mm. in 
d ameter, seated on a swelling and surrounded at its base 
by the bud scales, fleshy and soft beneath its outer layer. 
It contains an internal hard, woody gall, covered with a 
reticulated network of lines. The gall falls to the ground 
in October, and the internal one drops out. Imago in 
spring, II., III., VI. 
Andricus inflator form globuli 227 
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