AMERICAN HYMENOPTERA. 37 



E. Wings with one marginnl, appendiculate cell. 

 Threo submarginal cells. 



1. First submarginal with twa recurrent iiervures 20, '>■■'• '^ 



2. Second " " " " 21, 



3. First and second submarginal each with one 



recurrent nervure 22, Didymia. 



Four submarginal cells. 



1. Second and third submarginals each with one recurrent nervure. 



Posterior tibise without side spur 23, Ptilia. 



Posterior tibise with side spur 24, Hylotoma. 



2. Second submarginal with two recurrent ner- 



vures 25, Pachylota. 



Subfamily .3. TENTHREDIXIDES.— Antennae 9-15 articulate. 



F. WiiHjs ivith one marginnl cell. 

 Three submarginal cells. 



1. First and second submarginals each with one 



recurrent nervure 26, Cladius. 



2. First submarginal with two recurrent ner- 



vures 27, Pristiphora. 



3. Second submarginal with two recurrent ner- 



vures Euura. 



Four submarginal cells. 

 Antennfe 9-articulate. 



4. Second submarginal with two recurrent nervures. 



Lanceolate cell closed in middle 30, Leptopus. 



Lanceolate cell petiolate ; posterior tibiae 



much flattened 29, Craesus. 



Lanceolate cell petiolate; posterior tibite as 



usual 31, Nematus. 



Lanceolate cell petiolate; second recurrent 



nervure received at intersection of second 



and third submarginal cells 32, Hessa. 



Antennfe 13-artieulate 33, Perreyia. 



" 11 " 34, Camptoprium. 



5. Second and third submarginals each with a recurrent nervure. 

 Antennae 10-articulate 35, Dictynna. 



" 9 " 36, Aulacomerus. 



G. Wings toith hoo marginal cells. 

 Three submarginal cells. 



1. First and second submarginals each with a recurrent nervure, 

 Antennaj 10-articulate 37, Druida. 



11 " 39, Fenella. 



9 



" " " short, subclavate 38, Fenusa. 



" " " long, slender. 



Third joint longer than fourth 41, Melicerta. 



Third and fourth joints nearly equal length. .42, Emphytus. 



2. Second submarginal with two recurrent ner- 



vures 43, Dolerus. 



