THE FAUNA OF SCOTLAND. 69 



7 (8) No transverse keel behind the depression at base of scutellum ; 



abdomen petiolated ; furrows of parapsides absent or 

 indistinct, - Neuroterus, 



8 (7) A transverse keel behind the foveae at base of scutellum. 



9 (10) Cheeks with a sharp furrow; antennae longish, thin, 15- jointed, 



the joints at least three""times as long as thick ; mesonotum 

 polished, the furrows complete; metanotum with two keels; 

 two foveae at base of scutellum separated by a sharp keel, 



Trigonaspis, 



10 (9) Cheeks without a furrow. 



11 (12) Second and third abdominal segments amalgamated, with 



scarcely a trace of suture; abdomen not petiolated; antennae 

 14-jointed; radial cellule closed; claws bifid; mesonotum 

 finely rugosely punctured, . . . . PcricUstus. 



12 (11) Second and third abdominal segment not closely amalgamated, 



the suture quite distinct. 



13 (14) Vertex, front, mesonotum, mesopleurae polished, glabrous;* 



l^ronotum with two foveae in front, polished between them ; 

 antennae 14-joiiited; claws simple; radial cellule open in 

 front, Xestoplianes. 



14 (13) On y the mesonotum polished ; pronotum without foveae. 



15 (18) Cheeks at least half a'=} long as the eyes; the radial ce'lule not 



usually elongated; abdomen not petiolate. 



16 (17) Claws bifid; mesonotum shining, impunctate; antennae 



14-jointed, Diastroplius. 



17 (16) Claws simple ; mesonotum shagreened, opaque ; antennae 



14-15-jointed, Aulax. 



18 (15) The cheeks less than one-half as long as the eyes ; radial cellule 



open, longish, narrow. 



19 (20) Keels of metanotum straight and parallel, or very short; 



antennae 14-16-jointed; sutures of mesonotum complete, 

 deep; two distinctly separated foveas at base of scutellum ; 

 abdomen scarcely petiolated, - - - - Axdricus. 



20 (19) Keels of metanotum hardly curved; antennae 15- jointed. 



B 



