INTRODUCTORY PAPERS ON ICHNEUMONID^. 181 



156,403 — 430; xxii.,pp. 231 — 252) many new species are described, 

 but only one new genus, ListrognatJius. Thomson (Opusc. Entom., 

 fasc. v., pp. 455 — 527) divided tlie typical Cryptidaj into four 

 tribes, — the Cryptina, Phygadeuonina, Hemitelina, and Stilpnina. 

 The Cryptina are further subdivided into three sections, which 

 include fourteen genera, eleven of which are new ; the Phygadeu- 

 onina are divided into two sections and three subsections, which 

 also include fourteen genera, all of which are new, except Phyga- 

 deuon. As these divisions and genei'a have not been generally 

 adopted we shall not further refer to them. 



In order to make the determination of species as simple as 

 possible, we have adopted the broad generic divisions of Taschen- 

 berg and Foerster, with the necessary alterations and additions. 

 The characters used in the table of species are those mainly 

 referred to by Taschenberg, viz. : — the shape of the metathoracic 

 spiracles, wliich are situated in the upper side of the metathorax, 

 rather nearer to the scutellum than to the abdomen (see Entom. xiii., 

 pi. i., figs. 2, 3 a, 3 d, 3 e) ; the completeness or incompleteness of 

 the metathoracic areae, which, when complete, consists of a supero- 

 medial area, and two lateral areas on each side {I. c, fig. 2) ; 

 sometimes the division between the middle and side areas is 

 wanting, sometimes the upper or lower dividing line of the 

 superomedial area, and sometimes the divisions between the 

 lateral arese. After these simple structural characters we have 

 divided them into groups according to colour, but, as before, we 

 must point out that colour is always variable and unsatisfactory. 



Foerster's characters for the Pezomachi are as follows : — He 

 first divides them into two large divisions, according to the 

 presence or absence of a curved raised line dividing the upper 

 part of the metathorax from the back or slanting part ; this line 

 is often more or less indistinct in the middle : he then sub- 

 divides them into those which liave the hairs, and the pits in 

 which they are placed, either dense or scattered ; the length of 

 the aculeus or ovipositor ; the comparative lengths of the third, 

 fourth and seventh joints of the antennse. Generall}^ speaking 

 the scutellum is wanting in the genus Pezomachiis, but in some, 

 species it is very indistinctly defined. 



Ratzeburg (' Die Ichneumonen,' vol. iii., p. 157 ; 1852) formed 

 tlie subgenus Heniimachus for those male Ileniiteles which had 

 the metathoracic arese indistinctly defined ; he included seven 



