publication of " Jurinean " Genera of Hymenoptera. 369 



V) in 24 Compartments, but somewhat smaller ones, are 

 shown just so many Wings or Genera with their Nomen- 

 clature.* One can now, if one has distinctly grasped the 

 Clavis metliodi, very easily guide oneself aright. But what 

 tends above all to faciUtate the Comprehension of this 

 Method are the figures of Species on the Plates following 

 (each with nine quadrangular Compartments) reproduced 

 perfectly in gravure by the Master-hand of Citizen Massol 

 from the incomparably accurate and beautiful Paintings 

 of Hr. Prof. Jurine, in such manner that to each particular 

 Genus there is assigned also one particular species.f 

 Accordingly, not merely does each Compartment or Quad- 

 rangle contain the entire Insect complete, and, if needful, 

 considerably enlarged also : but likewise apart from this 

 an Antenna, often also one for both Sexes, as well as a 

 Mandible much enlarged, accompanied by the Name of 

 the Insect. In this Way it is made almost impossible to 

 go wrong, J and if in one's own Investigations, it is desired 

 to ascertain the Generic-rights, even of unpublished insects, 

 by merely first consulting the Plates of Wings, one will be 

 so put in the right way by help of these Generic Tafeln, 

 that all error can in consequence be avoided with certainty. 

 Since the Characters of the Wings, Antennae, and 

 Mandibles are uniform beyond all Expectation, the Genera 

 themselves become extremely natural : the apparent,§ 

 forced or artificial, ceases consequently by degrees to be 



* If this account of the Plates is compared in detail with the 

 actual Plates 1 to 5 of the Nouvelle Methode as published it will be 

 found that they agree exactly. 



t Tlie statements in this last sentence do not quite agree with 

 what seem to be the facts of the case. On the (coloured) Plates VI 

 and VII of the Nouv. Meth. as published, and also on all those 

 following (except the last, which is unsigned and was evidently 

 added later), appear the names of Mile, (sic) Jurine as artist and 

 Gaisler (or ? Gaisler) as engraver. And it is stated by Klug (Mon. 

 Siric, p. 5, 1803) that Jurine's Figures were produced by his 

 (Jurine's) daughter. We must leave these discrepancies of 

 evidence as they stand. Possibly further facts may come to light 

 which will account for them. 



The words " to each particular Genus there is assigned also one 

 particular species " deserve attention as indicating that the author 

 had a more or less distinct conception of what are now called Geno- 

 types — the fixation of a Genus by a species selected ad hoc ! 



X Panzer, however, did go wrong in certain cases when he tried 

 to apply the Method himself. 



§ We suppose this to mean " merely apparent " — (unreal or 

 superficial ?). 



