290 BRITISH ICHNEUMONS. [Exelastes. 



distinct ; metathorax stout, usually parallel-sided and dorsally scabriculous ; 

 areae obsolete or wanting; spiracles oval and not large. Scutellum mutic ; 

 convex or gibbous, especially when not pale. Abdomen narrow, subses- 

 sile and subcompressed at the apex, smooth and nitidulous ; petiolar spira- 

 cles a little before the centre ; second and third segments margined ; 

 terebra distinctly exserted. Legs slender, the hind pair elongate; pos- 

 terior tibiae bicalcarate with the tarsal claws simple. Wings normal, often 

 clouded ; areolet irregularly rhomboidal ; radius emitted slightly before 

 the centre of the stigma, nervelet usually distinct ; hind wings with the 

 nervellus intercepted above the centre and the first radial abscissa only 

 half the length of the second. 



Thomson points out (O. E. xxii. 2414) that this genus is separable from 

 Banchus by its entire eyes, which though not uniform in shape are never 

 emarginate, the subentire scape and mutic scutellum ; the external orbits 

 are not fiavidous, the mandibles have the upper tooth obliquely truncate 

 and somewhat longer than the lower and the areolet, though large and 

 rhomboidal, is yet smaller and seldom sessile; the recurrent nervure of the 

 hind wing intercepts the radius in its first third and is shorter and slightly 

 oblique. He adds that several of Gravenhorst's species probably belong 

 to a distinct genus in the Lissonotides, 



No attempt has hitherto been made to tabulate the species of this genus 

 in a natural manner. Both Thomson and I have drawn up a colour 

 scheme to facilitate identification {cf. E. M. M. 1903, p. 158); but a study 

 of such material as I have at hand convinces me that good structural fea- 

 tures exist, though somewhat obscure and difficult to tabulate. No un- 

 certainty, however, should remain if both the following methods of deter- 

 mination be employed. 



Tabic of Species. 



(18). I. Basal segment at least twice longer 

 than apically broad. 



Petiole discally glabrous. 



Mesonotum finely punctate, subgla- 

 brous and less convex. 



Hind femora immaculate red ; meta- 



pleural costae less distinct .. i. CINCTIPES, i?^/2. 



Hind femora at least apically black ; 



costae more distinct . . . . 2. NIGRIPES, Grav. 



Mesonotum strongly punctate, shortly 

 pilose and more convex. 



Metanotum not longitudinally canali- 

 culate in the centre. 



Frons closelv punctate and dull ; areo- 

 let subsessile 3. GUTTATORIUS, Gr. 



Frons centrally sparsely punctate ; 

 areolet petiolate. 



Nervelet extending to near centre of 



cubital cell . , " 4. femorator, Desv. 



