66 THE CANADIAN ENTOMOLOGIST. 



DESCRIPTIONS OF NORTH AMERICAN HYMENOPTERA, No. 6 



BY E. T. CRESSON, 

 Continued from Page 54. 



Genus Toxoneuron, Say. 



The characters of this genus are given at length under the name of 

 Tenthredoides (Proc. Ent. Soc. Phil., iv., p. 290), which appears to be 

 synonymous. It may be easily recognized by the short robust body, 

 rather large transverse head, stout legs, broad ample wings (which are 

 generally fuliginous), and especially by the form of the marginal ceil, 

 which is rather suddenly constricted (or somewhat reclivate) at tip of 

 second sub-marginal cell, and thence narrowed to the apex, which is some- 

 what incurved, and reaches the extreme apex of the wing ; this, as well 

 as the second and third submarginal cells, are indistinctly defined, the 

 nervures being sub-obsolete. 



The species, thus far known, may be distinguished by the characters 

 given in the following table: — 



Body entirely black. 



Wings entirely fuliginous. 



Legs black, anterior knees honey-yellow. 



Tibial spurs black 1 . ^ethiops. 



Tibial spurs white 2. mixutum. 



Legs black, anterior femora and tibia?, and intermediate 



knees honey-yellow 3. Orizaba. 



Legs honey-yellow, coxae, trochanters, tips of posterior 



tibia? and their tarsi black 4. explorator. 



Wings hyaline, apex fuliginous. 



Legs entirely black 5. mexicaxum. 



Legs black, anterior pair except base honey-yellow G. apicale. 



Legs black, anterior tibiae and tarsi, base of intermediate 

 tibia?, their tarsi and band at base of pos- 

 terior tibia? white or yellow 7. tibiatoe. 



Body black ; head, pro and mesothorax and anterior legs flavo- 



ferruginous 8. thoracicum- 



Body black ; abdomen and legs flavo-ferruginous 9. abdomixale. 



Body ferruginous ; head, antennae, metathorax and pleura black... 10. semixicbum. 

 Body fulvo-ferruginous ; mouth, antenna?, pleura beneath and 



metathorax black 11. viator. 



Body yellow ; three spots on mesothorax, spots on pleura, and ab- 

 domen, except base, black 12. orxatum. 



