68 THE FAUNA OF SCOTLAND. 



23 (22) Claws simple, mesonotum clearly shagreened or punctured , 



opaque, • Aulax, 



24 (21) Cheeks half as long as the eyes; apical joints of flagellum 



thicker than the fifth or sixth; pronotum small; radial 

 cellule longish, narrow, open. 



25 (26) Base of scutellum with two sharply- separated foveae; carina© 



on metanotum straight and parallel, seldom curved or 

 diverging towards the apex; furrows of parapsides sharp and 

 complete ; antennae and tibiae not covered with hairs ; th& 

 third joint longer than the fourth, - - - Andricus. 



26 (25) Base of scutellum with a transverse furrow, or with two sharply 



separated foveae ; in the latter case the keels on metanotum 

 curved. 



27 (28) Claws single ; antennae and tibiae not covered with stifl" hairs, 



base of scutellum with t^vo foveae, mesonotum polished ; body 

 yellowish, BiorMza. 



28 (27) Claws bifid ; antennae and tibiae closely covered with stiff hairs ; 



a transverse furrow at base of scutellum ; the agamic form 

 hairy, especially on the legs and antennae ; thorax opaque,, 

 shagreened; sexual form polished, glabrous, - Dnjophanta, 



Males. 



1 (2) Petiole rugosely longitudinally furrowed, face sharply striated ; 



frontal keels seldom short and indistinct; radial cellule 

 closed; antennae 15-jointed, third joint sometimes enlarged, 



2 (1) Petiole not longitudinally furrowed. 



3 (4) Face with two parallel keels between the antennae and cl} peus; 



antennae 15-jointed, the third never enlarged and as long as 

 the fourth; base of scutellum with two foveae; metanotum 

 with two parallel carinae, . . . . Ceropires, 



4 (3) Face without keels. 



5 (6) Mesopleurae on lower side with a stout, often punctured or 



reticulated longitudinal furrow ; third antennal joint the 

 longest ; radial cellule closed ; claws simple, - Rlwdites, 



6 (5) Mesopleurae without a longitudinal furrow. 



