Galls caused by the larvae of Rhodites r088B Htg. 



on 



the leaves of Rosa canina Linn. 



PLATE lU- 

 Synonymy of Insect. 



Cynips rosce Linn., Rennie. 



Diplolepis bedegiiaris Geof. 



RJwdites roscB Schen., Marshall, Mayr, Fitch, Cameron. 

 Habitat of the Dog-rose. — This is the commonest rose 



in Britain, and grows rapidly and luxuriantly in hedges, 



thickets, and various dry places in all parts of the country. 

 The Gall is formed by ova being deposited in a leaf-bud, 



each ovum becoming surrounded with layers of sap. 

 Position. — On the leaf 

 Manner of Growth.— Conglomerated ; sessile ; globular ; 



covered with moss-like hairs. 

 Colour.— Greenish, pink, or crimson. 

 Average Dimensions of a Mature Specimen. 



Diameter, 35 mm. 

 May be sought during any month in the year. 

 The Growth is complete by the end of August. 

 The Typical Condition of the gall is plurilocular. Usual 



number of cells, 30. 

 The Larv.E pupate in the gall. The imagines emerge 



during June. 

 Inquilines. — Periclistus brandtii Htg., Synergus ruficornis Htg. 

 Parasites. — Porison harpurus Gr., Hemiteles luteolator, Tory- 



mus longicaudis Ratz,. T. bedeguaris L., T. rosarum Gir. 



The gall is also figured in "The Royal Natural History," 

 section xi., p. 21 ; by Peter Cameron, "British Phytophagous 

 Hymenoptcra " (Ray Society), vol. iv., plate 10 ; Robert Brown, 

 "Our Earth and its Story," vol. iii., p. 63; Rev. J. G. Wood, 

 "Homes without Hands," 1892, p. 482; J. Rennie, "Insect 

 Architecture," 1845, vol. ii., p. 119; and in various other 

 publications. 



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