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XXVIII. On the external Characters of the Stirpes 

 and Genera of the Fnmihj Tentbredinidea, with 

 Descriptions of several new Species. 



TENTHREDINIDEA. 



Tenthredo. Liime. 

 Tenthredinet^. Latreille. 



The object of this paper is to give the external charac- 

 ters of the Genera of this family, to enable the student 

 to distinguish them without examining the parts of the 

 mouth. 



Entomologists are indebted to Fabricius, Latreille, and 

 Jurine, for the observations by which the Genera have, 

 been established ; and to Klug for the determination of 

 the Species, on which he has published a series of excel- 

 lent monographs in the Berlin Magazine. 



Latreille's Genera Cephus* and XiPHYDRlAf, which 

 he has placed in the second division of this family, I have 

 removed from it. Their oviduct is exserted and elongated, 

 and they altogether want the suckers :{; beneath each joint 

 of the tarsus, a character belonging to every genus of the 

 Tenthredinidea. Their instrumenta cibarla too are very 

 different. 



I am not certain as to the natural position of the Stirpes 

 in the following Synopsis. 



* AsTATUs King. Trachelus Jurine. 



f Hybnotus Klug. 



+ A character to which my attention was directed by Sir J. Banks. 



