I9a2.] 95 



4 (1) Thorax rarely with brown hairs, whicli aro not conspicuously bright, 



generally with pale or griseous hairs. 



5 (6) Basal abdominal segment with a large area of oppressed tomeutum 



on each side, thorax often distinctly submetallic ; length about 

 8-10 mm., expanse usually 14 mm. or more. 



(Thoracic sculpture much as described below under nitidus.) 

 .... 2)rastnus Sm. 



6 (5) Basal segment merely hairy at tlie sides. 



7 (8) A large species, with conspicuous tomentose pattern ; mesonotura 



dull, with dense shallow punctures; propodeum with the anterior 

 area finely rugose, the Literal angles being rounded off and without 

 a rrtised margin behind ; expanse usually 18 mm. or more, length 

 usually 10 mm. or more, unless the segments are contracted. 



(Clothing of liead and thorax cinereous, wings with smoky in- 

 fuscatiou) nitidus Panz, [G-notatus K.). 



8 (7) Species of the size of the preceding, or approaching it, have the meso- 



notum strongly punctate, or the propodeum with a raised margin 

 behind, the angles not rounded off. 



9 (12) Large and robust species (expanse 14 mm. or more), abdomen with 



conspicuous tomentose pattern, and the three basal segments entirely 

 black right to the actual apical margin, the propodeum with raised 

 margin* at the hind angles, or at least bounded there by strong 

 rugosity. 



(Mesonotum densely, strongly punctate, the anterior area of the 

 propodeum strongly rugose and generally shining between the 

 wrinkles.) 



10 (11) Basal abdominal segment highly polished, with only a few widely 



separated punctures on the disc 



.... zonulvs Sm. 



11 (10) Basal segment not polished, but with microscopic sculpture between 



the punctures, which are numerous on the disc. 



(Thoracic hairs paler (less brown) than in the preceding.) 

 . . , . leucozonius K. 



12 (9) Species smaller, or at least less robust, than the two preceding ; the 



larger ones have some or all of the more basal segments pale along 

 the apical margins, or else the propodeum is not margined behind, 

 while others lack a conspicuous pattern of white tomentum. 



13 (16) Tomentose spots or bands at the base of 2nd and 3rd segments 



distinct to the naked eye, and these segments black right up to the 

 apical margins: mesonotum densely, strongly punctured, the pro- 

 podeum closely rugose, dull or scarcely shining, without a raised 

 margin behind, the angles rounded off. Subrobust, medium-sized 

 species, expanse of wings 12 mm. or more. 



14 (15) Inner margin of stigma pale, yellowish or testaceous ; basal abdominal 



segment usually less polished, especially on the apical part, and 

 there more densely punctured, the 2nd segment with the punctures 

 even and almost as dense as possible all over, dull or scarcely 

 shining ; face very wide .... A-notatus K. 



* This character is easily seen iu these and other species when the propodeum ia viewed from 

 above, or a littU" in front, the head of the insect beinj; towards the observer. 



