no. 22.] hymenoptera of connecticut. 45 



Emphytin^. 

 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 I3 



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



free part of M4 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 M4; claws with a minute erect tooth at 



middle 4 



Front wings with second abscissa of Cui subequal in length 

 to free part of M* S 



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



with cell Ri+i without an appendage at apex 



Hemitaxonus p. 46 

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



wings with cell Ri+s 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 R4, or transverse part of 



M2, or with both present 11 



Hind wings with both free part of R4 and transverse part of 



M2 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 Ri and transverse part of 



M2 present Eriocampa p. 58 



Hind wings with free part of Ri wanting 12 



12. Head and thorax strongly cribrately punctate 



Pseudosiobla p. 58 

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



