CEdemera.] HETEROMER.A. 59 



I. Posterior femora of male very strongly thickened; cobur 



bright emeraid-green, bluish or reddish, shining . . . . O. NOBILIS, Scop. 



II. Posterior femora of male not or scarcely thickened ; colour 



dark sage-green, dull O. LFBIDA, Marsh. 



O. nobilis, Scop, (ccentlea, L.). Elongate, shining, bright green, 

 bluish-green or blue, sometimes reddish or coppery ; head subtriangular, 

 closely and rugosely punctured, eyes prominent, antennae long and 

 slender, dark, metallic at base with the under-side of the basal joints 

 yellow ; thorax a little longer than broad, widest before middle, uneven, 

 rugosely punctured ; scutefium small ; elytra separately narrowed from 

 base to apex, divaricate, closely and rugosely punctured, with strong 

 raised lines ; legs long, dark, more or less metallic. L. 8-9 mm. 



Male with the posterior femora very strongly thickened, and the pos- 

 terior tibiae strongly thickened. 



On flowers, &c. ; generally distributed, and common in many localities, in the 

 London, south-eastern and southern districts ; Essex; Suffolk; Gloucester; Bewdley 

 Forest ; Swansea ; Tenby ; Barmouth ; Conway ; it is rare in the midlands and 

 Avesteru Welsh counties, and has not been recorded from further north. 



O. lurida, Marsh. Of a dull sage-green colour, sparingly clothed 

 with fine pubescence, very closely and rugosely punctured ; apart 

 from its colour it is easily distinguished from the preceding by having 

 the elytra only slightly narrowed separately at apex ; the thorax is 

 scarcely longer than broad, more coarsely punctured than elytra, un- 

 even, with a more or less distinct central furrow ; the raised lines on 

 the elytra are distinct. L. 6-7 mm. 



Male with the posterior femora scarcely thickened, the fifth ventral 

 segment of abdomen deeply emarginate, and the posterior tibiae armed 

 with a hooked spur. 



Female with the posterior femora not thickened, and the fifth ab- 

 dominal segment entire. 



Grassy place? ; on flowers ; by sweeping, &c. ; local ; London district, rather 

 common, ML-klt ham, Caterham, Keigate, Sevenoaks, Lee, Darenth Wood, Dulwich, 

 Eshev, Cowley, Wey bridge, Chatham, &o. ; Dover ; Hastings ; Portsea ; Isle of 

 Wight ; Devon; Buth ; Swansea; Bannoutb ; Cotswold Hills; Bewdley Forest; 

 Durham. 



ONCOIVXERA, Stephens. (Dryops, Fabricius.) 



This is a small genus, containing about half-a-dozen species, three 

 being found in Europe, one in Algeria, and one in Japan ; our single 

 British species is a long and rather conspicuous insect, of very delicate 

 consistency and slender form ; it is found very locally on ivy bloom ; the 

 head is considerably produced before the eyes, which are large and kidney- 

 shaped ; the antennas are filiform, 11-jointed in both sexes, long and very 

 slender, with the second joint very short, and the third and following 

 very long, the last being comparatively short ; the thorax is oblong, con- 

 stricted at base,nrach narrower than the elytra, which are of a coriaceous 



