64 CLASSIFICATION. 



two, is an important distinction ; yet it is very diffi- 

 cult to find characters to separate the two divisions 

 in the perfect state. Hoplocampa might, for example, 

 be ranged with Dineura, with which it agrees in the 

 form of the antennas and in the position of the basal 

 nervure, while it differs in both of these points from 

 Blennocampa, &c. The only absolute distinction is 

 that the second cubital cellule receives both recurrent 

 nervures in the Nematina. 



Lophyrus appears to me to possess sufficient distinc- 

 tive characters to merit its being formed into a tribe. 



As to the grouping of the tribes I certainly think 

 that the affinities of Lophyrus are with Tarpa and 

 Lyda rather than with the Tenthredina. Its relation- 

 ship with Cladius, near to which it is more often 

 placed, is not very great ; the similarity of the an- 

 tennae in the males, so far as it goes, cannot be 

 regarded as of great value, being merely a sexual 

 character. Pterygophorus, again, unites Lopliyrus with 

 Hylotoma, as does also Brachytoma, and one or two 

 undescribed genera known to me. On the other hand, 

 the distance between Hylotoma and the Gimbicides is 

 bridged by such genera as Syzygonia and Incalia, 

 which again are related to Brachytoma, especially 

 in body form and in the formation of the trophi, 

 in which the number of joints is reduced, thereby 

 approximating with the Siricidce. In these tribes we 

 find spined tibiaa, as in Lyda, and appendicular cellules 

 in the forewings, neither of which exist with the Tenthre- 

 dina. Besides that, Lophyrus, Gimbex, and Hylotoma 

 agree with Lyda and the Siricidce in the form of the 

 metathorax. The only partial exception to this is 

 Honoctenus, which, however, differs from Gladius in the 

 form of the antennae, and in its larva having twenty- 

 two legs. 



I would then divide the family in the first place 

 into two divisions : division 1 containing the Tenth- 

 redina, Nematina, Hylotomina, Cimbicina, and Lophy- 

 rina, all distinguished by the larvae having six or more 



