206 BRITISH ICHNEUMONS. [ Exenterus 

from LZ. similis, and it was also bred from ZL. pin by Giraud (Ann. Soc. 
France, 1877). As in Sweden, it is doubtless to be found in our pine 
woods, wherever the destructive ZLophyrus pin? occurs ; it is, however, 
apparently very rare with us, since we have no record since Stephens 
called it “ Very rare: taken near London and in the north of England ” 
in 1835; but on 26th June, 1910, I received a fine specimen of this 
beneficial insect from Kew Gardens, just bred from Lophyrus pini at 
Staindrop in Durham. 
4. gnathoxanthus, Grav. 
Tryphon gnathoxanthus, Gr. I. E. ii. 147,?. Exenterus gnathoxanthus, 
Holmer. Sv. Ak. Handl. 1855, p. 231, ¢ @. Cteniscus gnathoxanthus, Brisch. 
Sch. Nat. Ges. Danz. 1878, p.105,¢ ¢. 
A black, finely punctate and shortly pubescent species. Head trans- 
verse, shining and a little constricted posteriorly; frons deplanate and 
slightly impressed on either side; clypeus somewhat convex, apically 
rounded and, like the mouth and centrally subelevated face, flavous. 
Antennae somewhat shorter than the body and nigrescent with the basal 
flagellar joint a third longer than the second. ‘Thorax as broad as head, 
convex and shining; notauli distinct, pleurae subobsoletely punctate ; 
metathorax short with five very complete areae, of which the areola is 
elongate. Scutellum entirely impressed at its apex. Abdomen oblong- 
ovate or subfusiform; apical margin of the transverse second to fifth seg- 
ments discally, and whole venter, flavidous; basal segment broad and 
scabrous, gradually explanate apically, with carinae extending beyond its 
centre. Legs slender and red with the hind tarsi and tibiae black, and 
base of the latter testaceous above; and anterior trochanters flavous. 
Wings somewhat narrow; tegulae flavous; nervellus intercepted below its 
centre. Length, 6—7 mm. 
Distinct in its apically impressed scutellum. 
The original two females of this, which was considered to be a “very 
distinct species” by Bridgman, were taken near Warmbrunn in Silesia by 
Manger; Holmgren found it notuncommonly in marshy places in Sweden ; 
and Brischke bred a variety, erroneously thought by him to perhaps 
be Zryphon melanoleucus, Grav., from larvae of Selandria ( Periclista) pubescens 
in Prussia. Bridgman twice introduced as British the only indigenous 
specimen he knew (Trans. Ent. Suc. 1887, p. 374 ¢/ 1889, p. 435), which 
was captured at Bickleigh Woods in Devon by Bignell on zr1st August 
and is now in the Plymouth Museum. I possessa ¢ and. ?, taken by 
Col. Yerbury at The Mound in Sutherland on 24th August, 1990, and at 
Nairn on the Moray Firth, 21st July, 1904. 
ce 
5. pachysoma, Steph. 
Tryphon pachysoma, Steph. Ill. M. vii. 245. T. colorator, Zett. I. L. i. 388, ¢ 
Exenterus colorator, Holmgr. Sv. Ak. 1855, p.234, ¢. Cteniscus colorator, 
Brisch. Schr. Nat. Ges. Danz. 1878, p.105, ¢; cf. lib. cit. 1891, p. 61. 
A shining, finely punctate, black species with the abdomen centrally 
red and apically white. Head pubescent, tumidous, not small nor con- 
stricted posteriorly ; mouth, clypeus, the buccate cheeks, two confluent 
facial marks and the ¢ frontal orbits narrowly, flavous; clypeus slightly 
impressed before the subrotundate apex. Antennae a little shorter than 
