BRITISH ICHNEUMONS. 121 



coxae are basally black, inclining to those of /. a?!alis. The antennae, more- 

 over, usually filiform throughout, occasionally slightly taper in both /. latrator 

 and /. siibquadratus towards their apices, a curious deflection in so vital an 

 organ. 



The most reliable points of distinction of the J $ of /. sitbquadratiis from 

 those of/, latrator appear to me to exist in the stronger metathoracic punctura- 

 tion and darker flagellar joints. The white antennal band is always present on 

 five or six joints, while in /. latrator it is also very often present on five and 

 rarely on six : in both species it is very rarely entirely red. The scape and 

 basal flagellar joints are nearly always infuscated, very rarely clear red, and 

 in one instance the rufous colouring is replaced by stramineous ; while in /. 

 latrator the scape is rarely infuscated or quite black, and the flagellum un- 

 usually darker below the central band. The fourth segment is usually mainly 

 black, in latrator sometimes, in siihqiiadratus \-ery rarely, entirely red ; the 

 sixth and seventh are always white-marked, sometimes entirely white in the 

 latter ; occasionally the seventh alone or not at all (/. clcj^a/is, Grav.) in the 

 former. The areola in both species varies considerably in shape, and is occa- 

 sionally sub-hexagonal or incomplete apically ; /. latrator has it varying from 

 twice longer than broad to distinctly sub-cjuadrate, but still with the costulae 

 weak and the flagellum basally clear red ; in /. siibquadratus it varies from 

 slightly long-er than broad to distinctly transverse. The strength of the areolar 

 costae varies scarcely at all, and is always greater in the last-named species ; 

 that of the costulae \'aries more than the puncturation of the metathorax, which 

 is always deeper and coarser in /. siibquadratus^ though constant in neither. 

 The metathoracic spiracles are somewhat unstable in size and shape, but are 

 usually elongate-oval in both species, and not larger in /. subquad?-atus. The 

 cheeks do not appear to be narrower below, nor more coarsely punctate in 

 /. subquadratus. The aciculation of the post-petiole varies in both species 

 from distinct and regular throughout to absolutely wanting^, as in /. spurius, 

 with the description of which these extreme forms agree, excepting in colour, 

 perfectly ; sometimes it is present centrally but cjuite wanting apically, as in 

 /. qiiadriannellatiis^ Thoms. ; or it may be mixed with fine, scattered punctures. 



The (J (J of /. subquadratus appear to me to differ from those of /. latrator 

 in nothing but the colour of the antennae beneath and of the head, if this be a 

 reliable character. If these parts be flavous, the areola is always quadrate 

 or nearly so, as is, however, also the case in /. latrator, which has the head, 

 excepting the mouth parts, black. The size of the spiracles varies in both 

 these species. The flagellum of /. subquadratus is sometimes rufous beneath 

 with the basal joints darker. The petiole and part of the hind coxae are 

 occasionally flavous in /. latrator. 



I. analis, $ , appears to diverge in no structural detail from large examples 

 of the above species ; the antennae taper towards the apex no more than in 

 some otherwise typical individuals of /. latrator, the only appreciable dis- 

 tinction seeming to be that the coxae, hind femora entirely, and the anterior 

 femora basally, are blacky the inner orbits are red, but this colour would 

 appear to be of an evanescent nature, since a specimen taken three years ago 

 bore at that time distinctly red orbits, no traces of which are now discernible. 



My notes on the petiolar aciculation of the preceding species will show the 

 glabrosity of that of /. spurius to be an unreliable character, and I do not expect 

 the density of colour on the legs is invariably maintained. 



/. tneinorator, Wesm., seems to differ only in coloration from the above, 

 unless it be in the spinulose anterior tibiae of the 9 and longer antennae of the 

 (^. /. iiicoinptus has the thyridii much broader than the inter\-ening space, 

 and the structure of the head and antennae appear to differ slightly from those 

 of /. latrator. I. quadrianncllatus is distinct, beyond its colour, only in the 

 impunctate apical abdominal segments of the $ and larger thyridii of the $. 



I anticipate that ere long the above, and probably other now-recognised 

 " species," will be grouped together as local races or varieties of Ichiwunion 

 latrator. Fab. 



