Stenomacrus | BRITISH [CHNEUMONS. 69 

with the hind coxae nearly entirely black, and sometimes the hind or pos- 
terior femora infuscate above ; claw-joints and pulvilli large, with the 
latter longer than the claws. Wings with the areolet small and pen- 
tagonal ; stigma pale fuscous, not stramineous; radial cell not elongate, 
with apex of radial nervure nearly straight; anal nervure emitted from 
centre of brachial cell. Length, 23—3 mm. 
Easily recognised by its dark though not nigrescent stigma, which 
emits the radius from its centre, the sessile areolet and filiform antennae, 
which are nigrescent above. 
This species would appear somewhat uncommon with us ; Marshall has 
given me a female from Govilon in Monmouth and there is another in 
Capron’s Surrey collection; I took one sitting beneath a lime leaf in my 
Monks’ Soham garden at the end of May, 1908, and swept a single male 
from marsh herbage in Ranworth Broad in the middle of June, rgor. 
6. deletus, Thoms. 
Stenomacrus deletus, Thoms. O. E. xxii. 2442, ?. 
Black with the legs pale, the hind coxae black above, radial nervure 
apically curved, metathorax with no areae and the face pale below the 
scrobes. Length, 2? mm. 
Thomson says that the 2, which he thus shortly describes, is very 
similar to the last species, but has the antennae apically subattentuate, the 
face only centrally pale below the antennae, no metathoracic areae, the 
radius obviously sinuate, the second segment quite smooth and the 
thyridu pale. 
I have not seen the female but possess two males, which must be 
placed under this or a new name; it is always well to avoid the erection of 
new species when practicable and I consequently regard them as the 
alternate sex of the present, especially since they differ only in having 
the whole face, mouth, cheeks, underside of antennae and prosternum pale 
stramineous, with the hind coxae and antennae but subinfuscate above ; 
their size is two-and-a-half mm. and the abdomen is strongly deplanate 
towards its apex. 
It is only known from Sweden and I took my males sitting on the 
under side of lime leaves in my garden at Monks’ Soham, Suffolk, about 
6 p.m. on 24th May, 1908, during thundery but somewhat breezy weather. 
7. laricis, Hal. 
Orthocentrus laricis, Hal. Ann. Nat. Hist. 1839, p. 117, ¢. O. flaviceps, 
Holmgr. Sv. Ak. Handl. 1855, p.335; Brisch. Schr. Ges. Konig. 1871, p. 102 ; 
Schr. Nat. Ges. Danz. 1878, p. 109, ¢ (mec Grav.). Stenomacrus fortipes, Thoms. 
One xxi, 24420 oS: . 
Head of ¢@ flavous with only the occiput, vertex and an ocellar mark 
sometimes including centre of frons, black; of Q piceous with a facial 
mark below the scrobes and a central dot at the often rufescent frontal 
orbits flavous. Antennae ferrugineous, of 2 apically darker, of ¢ entirely 
stramineous beneath; basal flagellar joint cylindrical. ‘Thorax black, 
with complete metanotal areae, of g with the prothorax entirely stram- 
ineous. Abdomen rather longer than head and thorax, black or piceous 
with the central incisures and gastrocoeli testaceous ; basal segment en- 
tirely and second to beyond its centre aciculate-scabriculous, the former 
