British Hyrnenoptera. 215 



the labial palpi about equal to the 4th in length; 3' with five 

 ventral segments generally more or less visible, the 5th with a 

 lateral spinose process on each side ; genitalia with the stipites 

 long and slender, slightly curved, but scarcely thickened at the 

 apex. 



1. Heriades truncorum, Linn. (PL X., figs. 1 — la). 



Linn., Syst. Nat., ed. x., i., p. 575 ; Smith, Cat. Brit. 

 Hym., 2nd ed., p. 163. 



Small, black, very largely and rugosely punctiu'ed ; 1st segment 

 of the abdomen carinated semicircularly at its base ; apex of the 

 abdomen rounded in both sexes. 



(J . Black ; head and thorax very largely punctured, clothed 

 sparingly with brownish hairs ; face rather densely clothed with 

 pale hairs ; mandibles broad at the apex and bidentate ; antennae 

 rather long ; the apical joint of each slightly flattened ; wings 

 rather clouded ; metathorax shining, crenulate at the base. Abdo- 

 men with the 1st segment transversely and sharj)ly carinated, its base 

 nearly perpendicular and shining, its dorsal surface deeply punc- 

 tured and dull like the other segments ; 1st and 2nd segments with 

 a line of white hairs at the apex ; apex of the abdomen incurved, 

 simple ; beneath with only two segments visible, the 2nd densely 

 hairy ; 3rd and 4th slightly emarginate at the apex ; 5th denticulate 

 at the sides, the centre of the apex submembranous ; 6th pointed 

 with a slightly projecting central process ; 7th nearly entirely mem- 

 branous ; 8th long and tongue-like, more or less hairy (for genitalia, 

 &c., see PL X., figs. 1 — 1 a). Legs clothed with silvery hairs. 



5 . Very like the ^ . Abdomen not inflected at the apex, with 

 the first five segments banded with white hairs at the apex ; beneath 

 with a dense reddish yellow scopa. Length, 6 — 7 mm. 



Hab. Very rare ; the only recorded localities are 

 Brentford (Kirby), and Dulwich (Ingall). 



Stelis, Panz. 



Panz., Krit. Kev., ii., p. 246. 



Wings witli two submarginal cells ; maxillary palpi 2-jointed ; 

 labial palpi 4-jointed ; $ with the apex of the abdomen simple ; 

 five ventral segments exposed ; 6th rounded at the apex ; 7th very 

 narrow and fragile ; 8th broad and subquadrate, with a slight apical 

 projection ; genital armature with the stipites thickened at the 

 apex and somewhat square (see PI. X., fig. 2) ; $ withoizt any 

 observable pollen-brush. 



