THE FAUNA OF SCOTLAND. 67 



12 (11) A suture between the mesonotum and scutelhim, a ridge-like 



border behind the foveae. 



13 (14) Abdomen, especially from the third segment to the apex, 



closely covered with silky hair; antennae, head, and legs 

 pilose ; head swollen behind ; furrows of parapsides complete; 

 scutellum broader than long, with two foveae at the base. 



Cymps. 



14 (13) Abdomen not silky-haired. 



15 (16) Cheeks with a sharp furrow ; antennae 14-jointed, the flagellum 



thin, attenuated towards the apex; furrows of parapsides 

 sharp and complete; mesonotum polished; foveae at base of 

 scutellum separated by a sharp keel; metanotum with two 

 curved carinae; second joint of tarsi as long as terminal; 

 claws bifid ; abdomen red, . . . _ Trlgonaspis. 



16 (16) Cheeks without a furrow; the apex of flagellum not thinner 



than the middle. 



17 (18) Front, vertex, mesonotum, and mesopleura shining, smooth, 



glabrous ; antennae 13-14-jointed ; scutellum with two 

 sharply separated foveae at base ; pronotum with two smaH 

 foveae near the middle ; metanotum with two parallel carinae; 

 claws simple, Xestophanes. 



18 (17) Head and mesothorax not shining and polished. 



19 (20) Second and third abdominal segments without a suture, so that 



there are only six segments apparent ; cheeks without fur- 

 rows ; face laterally striated ; head not swollen behind the 

 eyes; metanotum with two parallel keels; pronotum not 

 narrowed in the middle, and with two, not very distinct, 

 keels; mesonotum finely punctured and pilose; antennae 

 12-jointed, the third joint shorter than the fourth, or equal 

 to it ; claws bifid, Perlclistus. 



20 (19) Second and third abdominal segments not united. 



21 (24) Cheeks more than half as long as the eyes, without a furrow; 



last joint of flagellum not thicker than the fifth or sixth, 

 pronotum scarcely narrowed in the middle ; furrows of parap- 

 sides complete; two sharply separated foveae at base of 

 scutellum ; ventral spine at the most scarcely longer than 

 broad; antennae 13-14-jointed; radial cellule short, broad. 



22 (23) Claws bifid, mesonotum poh'shed, - - - Diastrophus: 



