178 ICHIfEUMOXIDJE. 



than long, with the areola obsolete or narrow and sulcit'orm ; 

 petiolar area smooth, very short and basally incomplete ; spiracles 

 oval or circular. Scutellum a little convex, subtriangular and not 

 short. Abdomen sessile and cylindrical, scabrous, at least twice 

 as long as thorax and generally bearing tubercles or rugosities ; 

 its segments generally elongate, and always apically elevated and 

 nitidulous ; basal segment parallel-sided, not shorter than broad, 

 and centrally canaliculate, with the spiracles before the centre ; 

 apical ventral segment small and retracted from the anus, that of 

 $ longitudinally excised ; terebra at least as long as the body, 

 with the valvulae more or less strongly pubescent and not deflexed ; 

 d" valvulae shortly exserted and often stout. Legs subelongate, 

 very rarely dentate ; apical tana] joint twice or thrice as long as 

 the penultimate ; claws curved, not pectinate, those of $ lobately 

 dilated at the base. Wings not broad ; areolet irregularly tri- 

 angular, sessile or petiolate, emitting the recurrent nervure from 

 beyond its centre ; radial cell narrow and elongate. 



Range. India, Europe and ISorth America. 



Thomson very truly says (Opusc. Ent. viii. 737) that this genus 

 stands so close to Plmpla that no exact line of demarcation can 

 be found between them. In general, however, the species may be 

 known by the parallel-sided and cylindrical abdomen, which is 

 not coarsely punctate and always has the apices of the segments 

 broadly nitidulous, elevated and trans-aciculate, the $ has the 

 sixth to eighth segments transverse and the <$ has the second 

 strongly elongate ; the flagellum is ahvays entirely black, with 

 the joints of uniform breadth throughout, though not distinctly 

 discrete : the eyes are not unusually prominent, the vertex is 

 broad, the clypeus apically emargiuate or excised, and the terebra 

 is not deflexed and is thicker than in Pimpla. 



In Europe, the males of this genus are, like those of Rhyssit, 

 much scarcer and always decidedly smaller than the females. 



Table of Species. 



1 (4) Body flavous with black markings. 

 '2 (3) Notauli very strongly impressed; 



metanotum punctate niyritarsis, Cam., p. 179. 



3 (2) Notauli not strongly impressed ; [p. 179. 



metanotum glabrous nigromaculatus, Cam., 



4 (1) Body entirely black. 



5 (6) Abdomen thrice the length of head 



and thorax ; legs very short lachcsis, sp. n,, p. 180. 



6 (5) Abdomen twice the length of head 



and thorax ; legs of normal length. 



7 (10) Radical callosities pale ; hind femora 



red. 



8 (9) Abdomen strongly tuberculate ; te- 



rebra as long as body crassus, sp. n., p. 181. 



9 (8) Abdomen hardly tuberculate ; tere- 



bra longer than body iridipennis, sp. n., p. 182. 



