14 (15) Hair-band of 10th joiut wide throiigliout, very distinct and definite, 



occiipjing half the whole area of the face of this joint, or sometimes 

 more; niesonotum deeply, closely punctured, clothed with un- 

 usually long whitish pubescence ; basal abdominal segment nearly 

 impunctate ; species large or rather large 



.... jjelhicidus Sm. {pilifrons Th.). 



15 (14) Hair-band of 10th antenna! joint less large, its apical maa-gin in some 



species conspicuously curved and sometimes not clearly defined ; 

 some species are quite small, and some have shallow or fine meso- 

 notal puncturation. 



16 (17) A small species, with black or piceous-black abdomen, only the apices 



of some of the segments more or less obscurely reddish ; propodeum 

 viewed from in front shining, with distinct, well-separated, longi- 

 tudinal wrinkles, Avhich either end simply or are sometimes more 

 or less connected at their apices, before reaching the brow ; 

 scutellum shining, with sparse (or very sparse) feeble punctures ; 

 abdomen smooth, shining, and almost impunctate ; front tibiae black 

 or browu-black in front nu/er v. Hag. 



17 (16) Small black-bodied species have the propodeum densely rugose, often 



strongly reticulated, to the brow ; scutellum ofteu strongly punc- 

 tured ; front tibiae often pale in front. 



18 (23) Mesonotal punctures more or less dense and strong — in lonyulus 



which is one of the smallest species, they are strong for the size of 

 the insect, — the scutellum in normal examples strongly, and often 

 densely, punctured; these punctures sometimes even coarser than 

 those of the mesonotum. 



19 (^0) Sixth ventral segment nearly always with a shallow depression 



which is often very vague and feeble, varying in shape and extent 

 and sometimes only to be seen by inclining the insect this wav or 



that divisus K. (simi/is Wesm.). 



i?n (19) Sixth ventral segment without a depression, sometimes with a feeble 

 indication of a median raised line. 



21 (22) Abdomen often coloured as in nu/er, the second abdominal segment 



with at most extremely fine, feeble puuctures basally, just visible 

 under a strong lens. Mesonotal punctures finer than in divisus or 

 pvncticeps. 



(A small narrow species ; larger examples with the 2nd segment 

 of the abdomen largely red are referable to var. epidus v. Hag.) 

 .... longulus v. Hag. 



22 (21) Second abdominal segment with quite distinct puncturation basally ; 



mesonotum strongly punctured, the scutellum even more coarsely. 



(Conspicuously red-banded forms are common, biit melanic ones 

 are not at all infrequent.) .... puncticeps Th. 



23 (19) Mesonotal punctures in some species dense, but conspicuously shallow 



and not coarse ; in other species the mesonotal punctures are to a 

 large extent remote (or sometimes very remote) and fine. 



24 (27) Mesonotal punctures, for the most part at least, dense; abdomen 



ovate, unless unnaturally extended, much like that of a 2 in shape. 



Q 



