XXXVl 



INTRODUCTION. 



nervures, and these sufficed, when mentioned at all, to subsequent authors 

 till Korster elal)oiated names fur all the nervures and all the cells. Since 

 these convey little or nothing, however, beyond their sound to the un- 

 initiated, I prefer a more direct method than tliat of Marshall, transposed 

 to the Ichneumonidae by Kridg.-l''itch, and pro[)Ose the adoption of the 

 foll(jwing intelligible orismology, which claims nothing but simplicity, 

 facility of retention and more or less uniformity with those terms applied 

 to analogous organs in the other groups of Hymenoptera. 



In the forewing, the nervures set forth in the figure are best explained 

 by the names attached to them. The costal and sub-costal are united in 

 the costa, which extends from the radix (B) to the base of the stigma^ ; 



Cells of the Fouk Wing.— i, 2, 3, basal ; 4, 5, 6, cubital ; 7, 8, g, discoidal ; 10, anal ; 11, apical, 



or radial ; a, apex. 

 Cells of the Hind Wing,— r, costal ; 2, 3, basal ; 4, anal ; 5, radial ; 6, cubital ; 7, 8, first and 



second discoidal ; /;, buineral ntrvure. 



from the apex of the stigma to that of the wing (at a) is the metacarpus- ; 

 from the radix emanate two other nervures, the median"* and the posterior.'* 

 'I'he median is continued, from its junction with the first recurrent'' to the 

 apical margin of the wing, under the name of cubital nervure, that 

 part before the second recurrent ** being the internal cubital,^ sometimes 

 emitting a central nervelet, and beyond it the external cubital,^ which is 



1 Vorderrand, Forst. 



'i Holnifiren termed tlie costal nervure the first, the stigma (Randmal, Fiirst.) the second, and the 

 metacarpus the third abscissa of the costa. 



•^ This is the prebrachial of Bridg. -Fitch, the cubitus of Thonis., the median of Berth, and Saund., 

 and the first part of Fiirster's Mittalader, vena media. 



4 The pobrachial of Bridg. -Fitch, brachium of Thouis., anal of Berth., Hinterader or vena 

 postica of Forst., and posterior of Saund. 



5 The posterior discoidal recurrent, Bridg. -Fitch ; reciirrens primus, Grav. ; recurrens 

 ordinarius, Holmgr. ; the middle part of Forster's Mittalader, its apical part being his second 

 Ilumeralqnerader. 



I' Die 2 Discoidalqiierader, Forst.; exterior discoidal recurrent, Bridg. --Fitch ; recurrens dis- 

 coidalis, Holmgr. It is often in part interstitial, the pellucid portions b)eing termed fenestrae. 



7 The internal discoidal recurrent, Bridg. -Fitch ; disco cubitalader or vena disco-cubitalis, Forst. 

 (Holmgren, 1855, fig. 26, refers to the upper basal as the internal cubital in ei luii'). 



« Die Fortsatz der Ellenader (cubitalader), vena cubitalis, of Forst. 



