Smicroplectrus] BRITISH ICGHNEUMONS. 301 

small. Scutellum apically impressed. Basal abdominal segment rugu- 
lose, laterally margined and discally carinate nearly to its apex; remain- 
ing segments scabriculous and somewhat dull. Areolet shortly petiolate ; 
apex of radial nervure nearly straight and nervellus intercepted below its 
centre. 
Black with the clypeus, mandibles, palpi, face, cheeks, underside of 
scape, tegulae, scutellum, postscutellum and apical margins of all the 
segments, flavidous testaceous. Flagellum, base of scutellum and the 
legs partly red. Anterior coxae and trochanters flavous, the hind ones 
black. Length, 8—g9 mm. 
I do not know this species, of which Brischke bred the ¢@ from larvae 
of Nematus cheilon on the Continent, where it 1s said to occur in June. It 
was found rarely within the metropolitan district by Stephens in July ; at 
Wimbledon in Surrey during July, 1880, by Bridgman and at Kings Lynn 
in Norfolk in June, 1887, by Atmore (Trans. Ent. Soc. 1889, p. 434). 
DIABORUS, Forster. 
Forst. Verh. pr. Rheinl. 1868, p.195; Thoms. O. E. ix. 882. 
Body very finely punctate and pubescent. Mandibular teeth of equal 
length ; metathoracic areae complete-with the central determinate and 
not transverse ; apophyses obsolete. Abdomen subsessile, with the dis- 
cal segments more broadly white-margined in the centre; first segment 
short and but little narrowed basally ; the second obliquely impressed on 
either side of the base; ventral valvulae geniculately compressed and 
not vomeriform. Hind tibiae not calcarate; tarsal claws simple ; areolet 
entire. 
1. lituratorius, Linn. 
Ichneumon lituratorius, Linn. F. S. 1761,400; Gr. Nov. Act. Acad. 1818, 
p. 285; I. E. 111.948. Tryphon scalaris, Gr. lib. cit. ii. 149; Ste. Ill. M. vii. 235, 
¢. T. serlituratus, Gr. I. E. ii. 159; Ste. Ill. M. vii. 237, 9; Ratz. Ichn. d. 
Forst. 11.117; ili. 127. TJ. lituratorius, Zett. I. L.389, 9. Exenterus litura- 
torius, Holmgr. Sv. Ak. Handl. 1855, p. 228, ¢ ¢; Voll. Pinac. pl. xlii, fig. 6. 
Diaborus lituratorius, Thoms. O. E. ix. 889, ¢ ?. 
A nitidulous and finely punctate species. Clypeus apically rounded ; 
frons centrally canaliculate ; antennae but slightly shorter than the body ; 
metathorax short, with the petiolar area vertical. Basal segment of ¢ 
rugulose with distinct carinae, of 2 more glabrous with carinae obsolete. 
Nervellus intercepted far below its centre. 
Black with the mouth, clypeus, more or less of face, under side of scape, 
and lines both before and beneath tegulae, flavescent. Anterior coxae 
and trochanters, a triangular discal mark at apices of segments and the 
venter white in ¢, flavescent in 9. Femora, tibiae and tarsi red or 
rufescent, with the latter sometimes infuscate. Length, 5—7 mm. 
The scutellum is usually apically flavous-marked, the tegulae flavous 
and in @ the sternum is also usually more or less broadly flavous and the 
antennae apically rufescent. Marshall places Lwenlerus gibbus, Ratz., as 
synonymic with this species, and I am ignorant of the grounds upon which 
Dalla Torre considers them distinct. 
