368 Rev. F. D. Morice and J. H. Durrant on the 



of them indicate the Character of the Genera, while others 

 on the contrary, and that regularly in the self-same Wing, 

 declare the Character of the Arten (Species).* 



Every Wing of the Insects belonging to this Class is 

 divided as to its general Outline : into (1) Basis, (2) Apex, 

 and (3, 4) Margines. 



Every Wing is further divided as to the Areas con- 

 tained in it shaped by its interlacing Vessels, and the 

 resulting Anastomoses of the Nerves : into (1) the Punctum, 

 (2) the Radius, (3) the Cubitus, (4) the Nervi brachiales, 

 (5) the Cellidae radiales, (6) the Cellulae cuhitales, and 

 (7) the Nervi recurrentes.f 5, 6, 7, however, furnish 

 precisely those characteres generum only, which are abso- 

 lutely necessary for Estabhshment of the Genus : they 

 are therefore marked red X in Tab. I of the Instructionstafel, 

 to make this Character catch the eye at once. 



So, for Instance, the second Cellula cubitalis with its 

 Stielgen (petiolata) betokens the principal generic Character 

 of Nysson : the cellula cubitalis incompleta the altogether 

 exceptional one of Chrysis : just as a pecuhar lineola secans 

 in the cellula radialis § indicates the character of the Genus 

 Bremus. 



Plates II, III, IV and V bring out very clearly these 

 generic Characters in exactly || and adequately enlarged 

 representations of Wings. II and III each represent, in 

 20 quadrangular Compartments, just so many Wings or 

 just so many Genera : on each of those following (IV and 



* The meaning here may perhaps be made clearer by giving an 

 example. The Genus Miscophus is known by a peculiar " petio- 

 lated " cell, and its various Species show, in the same cell, further 

 characteristic differences of their own. 



t Panzer here and elsewhere, after the old German fashion, 

 treats the Latin terms which he is quoting according to the rules 

 of I^atin syntax, i. e. writes them as accusatives. We have thought 

 it unnecessary to follow the original in this respect. 



X This is not the case in the copies of the Nouv. Meth. 1807 which 

 have been consulted. In these the " characteristic " nervures are 

 indicated otherwise, viz. by dotted lines, and the Plate referred 

 to by Panzer as the " Instructionstafel " is altogether uncoloured, 

 as are those following until Plate 6. 



§ Here Panzer accidentally misrepresents Jurine, who says quite 

 correctly that the feature in question — a real but very incon- 

 spicuous one and generally ignored by describers' — is found in the 

 1st cubital cell (not the radial /). 



II We understand Panzer to mean that the enlargements are 

 made correctly to scale and to an extent convenient for practical 



