102 HYMENOPTERA ACULEATA. 



M. unicolor, V. d. Lind. — Entirely black, except the 

 pale calcaria, apices of the tarsi, and apex of the 

 antennro beneath ; face between the antennfe not tnber- 

 culated, but with a smooth raised line extending to the 

 central ocellus, more marked in the ? than in the ^, 

 clypeus in the ? not tuberculated, head and thorax rather 

 largely and deeply punctured, clothed with greyish hairs ; 

 mesopleurfe shining, very remotely and finely punctured, 

 propodeum with a well-defined triangular, longitudinally 

 rugose, basal area, its sides clathrate and hairy; abdomen 

 shining, finely punctured, carina of the petiole sometimes 

 sulcate, apical dorsal valve in the ? dull, flat, very largely 

 and somewhat closely punctured, genital armature in the 

 S with the apices of the stipites blunt, not produced ; tibiae 

 very shortly spinose. 



L. 7-8 mm. 



"Woking, Chobham, common in July and August. Bar- 

 mouth; Charlton, Kent; entering straws of thatch ; (Smith). 

 Glanvilles Wootton ; Charmouth ; Sidmouth ; Parley 

 Heath; (Dale). Isle of Wight ; {Mars/iaU). 



M. Dahlbomi, Wesm. — Colour like that of unicolor, 

 but antennas entirely black. 



(J besides having the antennae entirely black, has the 

 head and mesonotum more finely punctured, the petiole of 

 the abdomen rather wider and its carina more triangularly 

 excavated, also it has the genital armature with the stipites 

 produced into a styliform process at the apex. 



5 with the carina of the petiole of the abdomen tri- 

 angularly excavated in the centre, and the apical dorsal 

 valve narrow, shining, much raised at the sides and in the 

 centre, and only punctured between the elevations. 



L. 7-8 mm. 



Apparently rare. I recorded it from Chobham, in my 

 synopsis from two males taken there, but on re-examination 

 these prove to be unicolor, although the petiole is distinctly 

 grooved. Mr. V. R. Perkins takes it in Gloucestershire at 



