52 XESTOPHANES POTENTILLA. 



Foerster founds his " genera " Isocolus and Eubo- 

 thrus on this species. 



The species has only been found at Tapley Pike, 

 near Buxton, in this country (cf. Fitch, Ent., x, 

 p. 124). 



Continental distribution : Sweden, Germany, Aus- 

 tria. 



Genus Xestophanes. 



Xestophanes, Foerster, Verh. z.-b. Ges. Wien, 1869, 337. 



Antennse $ 13 — 14-jointed. Face, occiput, mesonotum, and meso- 

 pleurse shining, glabrous. Scutellurn with two distinct fovea3 ; two 

 minute foveae on tbe pronotum in the middle behind. Parapsidal 

 furrows abbreviated or entire. Median segment with two parallel keels. 

 Radial cellule short, broad, open at fore margin, closed at base. Second 

 and third abdominal segments united, sometimes with a furrow. 

 Abdomen for the greater part, and legs pallid. Claws of fore tarsi 

 entire. The $ with the antenna? 14-jointed; the third joint curved. 



The species of this genus are confined to Potentilla. 

 From the allied genera it is readily recognised by the 

 glabrous shining head and mesothorax. 



Besides our two species only one other is known, 

 namely, X.foveicollis, Thorns., which differs from them 

 in having the pronotum and metathorax " dense 

 griseo-tomentosis." 



1 (2) Third antennal joint not longer than the fourth ; fourth joint 



of hinder tarsi longer than wide ; parapsidal furrows incom- 

 plete. Potentillse. 



2 (1) Third antennal joint perceptibly longer than the fourth; fourth 



joint of binder tarsi not longer than wide; the parapsidal 

 furrows complete. Brevitarsis. 



1. Xestophanes potentilla. 



PI. XII, fig. 3, ? . Sa, antenna ; 3 &, hind tarsus. 

 PL XVII, fig. 1, gall. 



Cynips potentillse, De Vill., Linn. Ent., iii, 77. 



Aylax splendens, Htg., Germs. Zeits., ii, 196. 



Aulax potentillse, Schenck, Nass. Cyn., 96, 99, and 126; Mar- 

 shall, B. M. M., iv, 275 (?) ; Mayr, Cyn. 

 Gallen, 12, Taf. ii, fig. 9; Europ. Cyn., 10. 



Aulax abbreviatus, Thorns., Opusc. Ent., 1877, 805. 



