102 [May, 



21. Large g (about 9.V mm. long) with dorsal-plates 2 and 3 of abdomen finely 



rugiilose and (n.b.) quite liairless in the middle. Head, tliorax, and 

 base of abdomen conspicuously metallic in certain lights. Wings 

 slightly and evenly inf viscated hxmatodes $ . 



— S S without the above characters, or 9 9 22. 



22. Very large forms ( c? S about 10 mm. long, ? ? 11 to 12 mm.). Deep black, 



scarcely metallic. Vertex laterally well defined. Tempora more or less 

 distinct sulcate before the occiput but (n.b.) never with a sharp occi- 

 pital margin. Sides lobes of mesonotiun much less closely punctured 

 than the midtUe lobe, hence more shining. Saw-sheath of ? (dorsal 

 view) not very long, somewhat thickened before the apex and then 

 again constricted 23. 



— Smaller species not normally exceeding 9 (J) tolO(?) nun. and 



generally much smaller. (Side lobes of mesonotiun sometimes piinc- 

 tru-ed as closely as tlie middle lobe. Temporal furrows sometimes 

 sharjily margined. Head and thorax sometwies with metallic reflec- 

 tions) 24. 



23. Side-lobes of mesonotum very shining. Wings almost clear. Cenchri 



clear white. Clypeus (n.b.) only obtusely emarginate at apex. Saw- 

 sheath of 9 (vie\\X'd laterally) subtruncate, its apex chithed witli long 

 and dense projecting hairs (jihhnsus, Htg. 



— Side lobes of mesonotum less shining. Wings with a slight blackish 



inf Lxscation. Clyi^evis (n.b.) v^^^ry sharply and deeply excised. 9 saw- 

 sheath somewliat more shortly pilose than in gihbosus nicjer, L. 



24. Mesonotum short and broad, with (n.b.) a semi-circular (not pointed) fovea 



siirrounding the pointed base of the middle lobe (see Figures in my 

 last paper) ; the side lobes exceedingly smooth and shining, almost 

 entirely impiuictate. Bluish-black forms 25. 



— Impression round the base of the middle lobe shaped like a pointed arch ; 



side lobes shining or not so, but always distinctly covjred with punc- 

 tiires though they may be very slight and shallow. Colour sometimes 

 deep black, rarely bluish, sometimes greenish-grey, with or witliout 

 distinct metallic reflections 26. 



25. Blue-black, very shining species. Head of ^ narrowed posteriorly and 



clothed with pale hairs. 9 witli tlie middle lobe of the mesonotum 

 bisected longitiidinally by a broad and deep excavation, and impunctate 

 except at the sides. Cenchri dusky. Radial nerve usually interstitial or 

 nearly so nitens, Zadd. 



= coracinus, C. 



= varispinus, C. ? 



= possilensis, C? 



— Very like nitens, but generally looks darker. Head of <? not narrowed 



posteriorly, and with hlach hairs (= atricapillus, Htg.). 9 with middle 

 lobe of mesonotrun punctured all over, and bisected only by a narrow 

 raised line (not a wide excavation !) Radial nerve usually not very near 

 tlie cvibital nei-ve. (Pei'haps does not occur later than April !)... 



anth7-acinus, Kl. 



