6o8 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



BETHYLID^. 



By Charles Thomas Brues. 



Key to Genera. 



1. Wings fully developed 2 



Wings absent or reduced in size 14 



2. Anterior wings with a closed small discoidal cell 



Parasierola p. 612 

 Anterior wings without any closed discoidal cell 3 



3. Radius well developed; one, two, or three closed basal cells 4 

 Radius not developed; median and submedian cells open.. 



Neoscleroderma p. 610 



4. Wings with an accessory thickening before stigma (para- 



stigma) s 



Wings without parastigma 7 



5. Antennae 13-jointed Goniozus p. 612 



Antennae 12-jointed 6 



6. Eyes pubescent; median and submedian cells of equal length 



Plastanoxus p. 611 



Eyes bare; median cell longer than submedian 



Progoniozus p. 612 



7. Metathorax not margined behind 8 



Metathorax margined behind 10 



8. Scutellum without foveae or an impressed groove at its base 



Apenesia p. 610 

 Scutellum with a broad transverse groove at its base....... 9 



9. Pronotum with a transverse groove before posterior margin; 



tarsal claws tridentate Pristocera p. 609 



Pronotum without such groove; tarsal claws simple or 

 bidentate Pseudisobrachium p. 609 



10. Radius much longer than basal vein, forming a cell which is 



open at apex II 



Radius very short, never longer than basal vein 13 



11. Base of scutellum with two fovese, sometimes united by a 



narrow impressed line Epyris p. 611 



Base of scutellum with a broad transverse groove across its 

 base 12 



12. Mesonotum without parapsidal furrows Holepyris p. 611 



Mesonotum with two parapsidal furrows . . . . Rhabdepyris p. 612 



13. Antennae 12-jointed Paralaelius p. 610 



Antennae 13-jointed Laelius p. 610 



14. Metathorax flattened, with one or several longitudinal 



carinae 15 



Metathorax without any median carina 17 



15. Base of scutellum with two foveae, parapsidal furrows present 



Epyris p. 611 



