CATALOGUE OF BRITISH PLANT-GALLS 175 



Hymen- Minute ovoid galls in dormant adventitious buds. See 

 optera No. 255. 



Dryophanta Taschenbergi Schl. 287 

 Ormerod, 1877, pp. 42, 43. 



,, Acorn containing numerous larval cells. See No. 274. 



Callirhytis glandium Giraud 288 

 Connold, Oak Galls, pi. 8. Houard, No. 1809. 



Castanea sativa Mill. Sweet Chestnut. 

 Diptera Minute rounded pustule on the leaf, about i mm. in 

 diameter, slightly raised on both surfaces, and of much 

 brighter green than the surrounding normal tissue. 



Cecidomyia sp. 289 

 C. Zimmermann, 1907. Houard, No. 1167. 



Fagus sylvatica Linn. 67. Beech. 

 Hymen- On the roots, solitary or coalescent, yellowish or reddish- 

 optera brown tumours, varying in size from a pea to a cherry. 

 See No. 239. 



BlORRHIZA APTERA BOSC. 290 



Contioid, Plant Galls, p. 137. 



Diptera On the midrib or on the adjacent part of a lateral vein, 

 on the upper surface of the leaf. A glabrous gall of Woody 

 consistency, ovoid but pointed, 8 to 10 mm. high, 5 mm. 

 in diameter, with thick green walls. Green or tinted with 

 red. On the lower surface of the leaf the gall is indicated 

 by a slight rounded swelling with a minute central open- 

 ing guarded by a fringe of hairs. Unilocular, larva white. 

 M. E. Gall falls away at maturity. 



MiKiOLA FAGI Hartig 291 



Syh. Hormomyia fagi Hartig. 



Connold, Veg. Galls, pi. 96; Plant Galls, fig. 51, his 

 galls appear to be those of Oligotrophus annulipes. He 

 describes them as being only 4 mm. in girth. Houard, 

 No. 1 1 5 1 (he does not allude to Connold's plate). 



•> On the midrib or a lateral vein on the upper surface of 



the leaf. Gall soft, hairy, ovoid, bluntly pointed, i to 3 

 mm. in diameter, walls thin and fragile, covered with 

 white or brown hairs. Unilocular, becoming detached at 

 maturity, leaving a circular scar on the leaf. Larva white. 

 M. E. (Plate IX. i.) 



Oligotrophus annulipes Hartig 292 



Syn. Hormomyia piligera F. Low, Hormomyia annulipes 

 Hartig, 



Connold, Veg. Galls, pi. 98 ; Plant Galls, fig. 52. 

 Houard, No. 11 53. 



