54 GENUS PEETCLISTUS. 



The species is found in Devonshire and Kent. 

 Continental distribution : Sweden, Germany. 



2. Xestophanes beevitaesis. 



PI. IX, fig. 3, gall ; PI. XII, fig. 12, antenna ; 

 12 a, tarsus. 



Aulax brevitarsis, Thorns., Opusc, 1877, p. 805. 

 Xestophanes tormentillm, Schlecht., Ent. Nach., 1880, p. 176; 



Mayr, Eur. Cyn., 10. 



Similar in coloration and size to X. potentillse, but readily separated 

 from, it by the third antennal joint being perceptibly longer than the 

 fourth, by the parapsidal furrows being complete, and by the fourth 

 joint of the hinder tarsi being hardly longer than wide. 



Length 2 - 2 mm. $ . 



The gall is found on the stems of Potentilla tor- 

 mentilla, on which they may occur singly as oval or 

 spherical swellings, or a number may be loosely or 

 tightly massed together. Some of the larger masses 

 are not distinguishable from the galls of X. jpotentillse 

 on P. reptans. The colour is at first green, then 

 purple or brownish, and they are slightly pubescent. 

 The average length of an individual gall is about 

 3 mm. ; the conglomerated galls may reach a length 

 of 20 mm. 



Of wide distribution in Scotland. 



Continental distribution : Sweden, Germany, Aus- 

 tria. 



Genus Peeiclistus. 



Periclistus, Foerster, Verh. z.-b. Ges. Wien, 1869, p. 337. 



Antennae, $ 12-, ^ 14-jointed, filiform, the third joint usually shorter 

 than the fourth. Face striolate laterally. Pronotum with two diverg- 

 ing carinas. Mesothorax finely punctate or alutaceous, pubescent. 

 Scutellum with two well-marked foveas. Parapsidal furrows straight, 

 parallel. Anterior claws bidentate. Radial cellule open at fore 

 margin. The second and third abdominal segments united. Median 

 segment with two parallel keels. 



