ON TH£ common oak 171 



Houard, No. 1347. Adler and Straton, Alternating 

 Generations, p. 90. Cameron considers A. marginalis 

 to be yi. quadrilineatus galling leaves, not a distinct 

 species. 



Hymen- On the male catkin. Gall unilocular, ovoid, about 3 mm. 



optera high and 2 mm. in diameter, glabrous, brown, its surface 



marked longitudinally with irregular striae, and terminating 



in a slightly marked umbo. Often abundant, sometimes 



more than thirty on one catkin. 



ANDRICUS QUADRILINEATUS Hartig 267 



Syn. Aphilothrix quadrilineata Hartig. 



Connold, Oak Galls, pi. 13; Plant Galls, fig. 225, 

 Houard, No. 1201. Adler and Straton, Alternating 

 Generations, p. 91. 



•t On the male catkin. Gall unilocular, fusiform, 3 to 6 mm. 



long, attached to the axis of the catkin usually by a shoit 

 stalk, green, more or less marked with longitudinal striae, 

 its extremity marked with a minute umbo encircled by 

 hairs more closely set at this point than elsewhere on the 

 surface. The stalk of the catkin is much swollen at the 

 point where the gall is seated. Imago, spring, II., III. 



ANDRICUS SF.MINATIONIS Adler 268 



Syn. Aphilothrix seminafionis Giraud. 



Connold, Oak Galls, pi. 24 ; Plant Galls, fig. 226. 

 Houard, No. 1200. Adler and Straton, Alternating 

 Generations, p. 87. 



On the lower surface of the leaf. Solitary or scattered. 

 Gall ovoid, 4 mm. long, at first yellowish white, becoming 

 yellowish-brown. Attached by a very short, stout stalk 

 to the midrib or a lateral vein. Surface glossy, slightly 

 nodular. Imago, October or November, I. 



Dryophanta agama Hartig 269 



Connold, Oak Galls, pi. 40; Plant Galls, fig. 201. 

 Houard, No. 1327. 



On the under surface of the leaf. Solitary or scattered. 

 Gall spherical, markedly flattened at the poles, 4 to 5 mm. 

 high ; there is a slight depression at the upper pole, with a 

 wart in the centre, slightly shining, yellow. Firmly 

 attached by a small stalk to the midrib or a lateral vein. 

 There are two cavities within ; the larva occupies the lower. 

 Imago, October or November, I. 



DrVophanta disticha Hartig 270 



Connold, Oak Galls, pi. 41 ; Plant Galls, fig. 202. 

 Houard, No. 1329. 



