British Hymenoptera. 195 



? . With the puncturation of the abdomen more even and close 

 than in the preceding, with the 6th segment more shining and 

 more strongly punctured, somewhat inclined upwards towards its 

 apex, and less finely attenuated ; beneath the 5th segment ia much 

 longer and more pointed and strongly punctured ; the 6th segment 

 is short, its sides subparallel, its apex obtusely angulated. Length, 

 10 — 15 mm. 



Hab. Common in some localities, and very variable 

 in size. The small variety umhrina can be distinguished 

 by no structural character from the large rufescens. It has 

 occurred at Chobham, Hants, Isle of Wight, Devonshire, 

 Yorkshire, Loch Eannoch, Norwich, and in Kent. 



4. Coelioxys elongata, Lep. (PI. VIIL, fig. 6). 



Lep., Hym., ii., p. 522 ; Smith, Cat. Brit. Hym., 2nd 

 ed., p. 142 = simplex, Nyh, Smith, 1st ed., &c. 



Another species almost exactly like the two preceding 

 in general shape and sculpture, but differing in the 

 following particulars : — 



<y . With the 5th dorsal segment toothed at the apex laterally ; 

 6th with the two upper apical teeth slightly divergent, so that the 

 two lower ones, which are nearly parallel, can be seen from above 

 lying between them ; the pubescent bands of the segments are 

 wider at the sides, and narrowed towards the centre, where they 

 are generally interrupted ; beneath largely punctured ; 4th segment 

 more finely and closely punctured than the 3rd, entke at its apex, 

 which has in its centre a smooth corneous lobe (for genitalia see 

 PL VIII., fig. 6). Calcaria pale. 



2 . With the abdomen irregularly and remotely punctured, as 

 in quadridentata ; the 2nd, 3rd, 4th, and 5th segments fringed at 

 the apex with pale hairs, forming a band widening to the sides ; 

 6th segment dull, narrowly rounded at the apex ; beneath with the 

 4th and 6th segments very finely punctured, the 5th narrowly 

 emarginate at the apex ; 6th very long, constricted, and with a 

 very minute tooth on each side before the apex. Calcaria pale. 

 Length, 12 mm. 



Hah. Widely distributed and common in many places. 

 F. Smith says it is parasitic on Megachilc ligniscca, 

 Wiling hhiella, and circumcincta. I have taken it pretty 

 freely at Chobham in places where the last-named species 

 of Megachile occurs. 



