22 BRITISH ICHNEUMONS. [Xjlonomus. 



more or less of the tarsi, black ; femora before the base, or more rarely 

 externally entirely, and in 9 anterior tibiae externally in the centre, infus- 

 cate ; anterior tibiae of ^ often fulvescent at base and apex. Wings 

 somewhat narrow and more or less clouded ; stigma and radix piceous, 

 the former narrowly white at base, the latter sometimes stramineous ; 

 tegulae infuscate and apically subtestaceous ; nervellus opposite and inter- 

 cepted slightly below centre. Length, 8-13 mm.*^ 



The abdomen is sometimes more or less infuscate, and Gravenhorst 

 mentions a 9 ^vith the basal segment apically and the third entirely black. 

 The (5 is more slender ; and, Taschenberg says, has the abdomen some- 

 times entirely black and the coxae red ; Brischke adds that the front coxae 

 may be apically red, the hind tibiae only centrally black and their tarsi 

 basally red. 



Both sexes are at once known by the elongate flagellar pilosity ; and 

 differ from X. irrigator in the less strongly contracted basal segment, 

 obsolete apophyses and longer terebra. 



This species appears to constitute the type of Forsler's genus S/trotric/nis 

 (Verh. pr. Rheinl. 1868, p. 169). 



It has only been recorded in Britain from Coomb Wood and on a rail 

 near Hampstead in JMay and June, and the female figured by him was taken 

 (corrected in Ent. Soc. copy of B.E.) at Sevenoaks, by Curtis ; P'arlham, 

 near Norwich, by Bridgman ; and Hastings in the Victoria History of 

 Sussex. I possess, however, several females captured by Thornley at 

 South Levcrton, in Notts., and Peacock at Cadney, in Lines, in June 1898 

 and igo2 respectively; Piffard has taken several of both sexes at Felden, 

 in Herts. ; and I have myself swept two males : at Wortham in Suffolk, 

 in a marshy meadow in the morning of gth June, 1900, and from a hedge- 

 bottom in Wicken village, in Cambs., in the morning of 8th June, 1902. 

 These two last males do not appear to be typical, since they are smaller 

 than the average X. piliconiis and have the scutellum simple, not apically 

 excised and raised on either side as in the typical form ; they agree well 

 enough with the very short diagnosis of his X. glvp/tis gi^•en by Thomson 

 (O.E. viii. 776), but if this be a correct determination I have no hesitation 

 in considering the latter but a variety of the present species, at all events 

 until its female be discovered. 



* I thus described females, taken by Mr. Piffard, in igoo : — Head, viewed from above, nearly 

 square, slightly broader than long, black ; eyes not prominent ; vertex somewhat coarsely but sparingly 

 and unevenly punctate ; face also coarsely but more thickly punctured, somewhat protuberant below 

 the scapes ; clypeus separated by a strong semicircular carina enclosing the base ol mandibles, testa- 

 ceous, concave and glabrous ; maxillae small, black and simple at the apex ; maxillary palpi black at 

 base, ferrugineous towards the apex with the apical joint lon^t;, slender and tapering. Antennae 

 reaching to about apex of basal segment, and not to apex of wings; entirely black except a broad 

 white ring at the apical third, midway between which and the extremity of flagellum is a row of 

 rather long setae on the inner side, which vary somewhat in length. Thorax very long, cylindrical 

 and black throughout ; niesothorax with scutellar region twice as long as metathorax ; mesonotum 

 trilobed, discally flat, depressions scabrous and elevations punctate. Metathorax scabrous, areae 

 complete; transverse ridge terminating in small lateral teeth ; spiracles small, elongate and obliquely 

 transverse. Scutellum and postscutellum convex ; the former thickly and coarsely punctured, and 

 preceded by a deep bordered fovea which is divided longitudinally in the centre by a carina ; lateral 

 postscutellar areae strongly and obliquely striated. Abdomen somewhat longitudinally scabrous at 

 the base, gradually becoming hner towards the apex, apex of segment four and the following nearly 

 smooth and subnitidulous ; abdomen castaneous, part of third segment, apex of fourth and whole of 

 following black ; hrst segment half as long again as the second ; eighth exserted, with a longitudinal 

 sub-obsolete dorsal carina ; first distinctly bicarinate longitudinally and depressed transversely behind 

 the spiracles ; second and third with thyridii. Terebra a little longer than abdomen. Legs some- 

 what dark red and short; all coxae and, for the most part, trochanters, black; all tarsi, base of 

 posterior femora and whole of posterior tibae nigrescent; tibiae distinctly thickened and flattened, 

 especially the two front pairs ; tarsi cylindrical, with the claws very minute. Wings greyish, trans- 

 parent, narrow and not very ample ; nervures well-defined and rather thick; interior and exterior 

 discoidal recurrent interstitial; a small corneous expansion of the probrachial nervure just beyond 

 its interception by the posterior discoidal recurrent; stigma, costa, radix, tegulae and nervures dark 

 brown; just before the stigma the colour of the costa becomes for a short space white and pellucid. 

 Length, 12J-13 mm. 



