no. 22.] hymenoptera of connecticut. 45 



Emphytin^e. 

 Key to Genera. 



1. Posterior metatarsus subequal in length or shorter than the 



four following segments 2 



Posterior metatarsus distinctly longer than the four following 

 segments l 3 



2. Front wings with second abscissa of Cui never shorter than 



free part of M 3 



Front wings with second abscissa of Cui always shorter 

 than free part of M 8 



3. Front wings with second abscissa of Cui distinctly longer 



than free part of M; claws with a minute erect tooth at 



middle 4 



Front wings with second abscissa of Cui subequal in length 

 to free part of M 4 5 



4. Front wings with free part of 2d A oblique; hind wings 



with cell R1+2 without an appendage at apex 



Hemitaxonus p. 46 

 Front wings with free part of 2d A perpendicular; hind 



wings with cell Ri +2 with an appendage at apex 



Epitaxonus p. 46 



5. Hind wings with cell R1+2 always with a distinct appendage 



at apex; front wings with free part of 2d A oblique 6 



Hind wings with cell R1+2 never with an appendage at apex; 



front wings with free part of 2d A perpendicular 



Taxonus p. 46 



6. Claws bifurcate at apex Monostegia p. 47 



Claws always with a tooth but never bifurcate at apex 7 



7. Claws cleft, with inner lobe not more than one-half the length 



of outer lobe ' Phrontosoma p. 47 



Claws with an erect tooth at middle Empria p. 48 



8. Front wings with radio-medial cross-vein always present.... 9 

 Front wings with radio-medial cross-vein always wanting 



Emphytus p. 55 



9. Hind wings either with free part of R 4 , or transverse part of 



M 2 , or with both present n 



Hind wings with both free part of R 4 and transverse part of 



M 2 wanting 10 



10. Claws with a large erect tooth at middle Parataxonus p. 57 



Claws appendiculately toothed at base Polytaxonus p. 58 



11. Hind wings with both free part of R 4 and transverse part of 



Mj present Eriocampa p. 58 



Hind wings with free part of R 4 wanting 12 



12. Head and thorax strongly cribrately punctate 



Pseudosiobla p. 58 

 Head and thorax smooth, without punctures. . .Monosoma p. 59 



