100 TApril, 1910. 



4. Scutellum, with the pronotum, the mesonotum (except three black marks) 



and the propodemii red in both sexes ; or, in the S S only, the whole 

 thorax and propodeum may be black tripUcatus, Kl. 



— Sciitellum black ; pronotum, mesonotum entirely (i.e., without black 



marks) and i^ropodeum red madidus, KA. 9 (^:::latcritms, C). 



5. Pronotum, and middle lobe only of mesonotiim red (the side lobes beini,'- 



entirely or for the most part black), 9 9 8. 



— Pronotum and mesonotum entirely black, (? c7 6. 



6. Antenna) tapering, longer than abdomen : 8th dorsal segment with its 



apical half (or more) bisected by a long triangvilar polished un- 

 pression madidus, Kl. ^ . 



— Antennaj not longer than abdomen and scarcely tapering ; apex of 8th 



dorsal segment with a central carina between two short impressed 

 fovea; 7. 



7. j\^pical segments of abdomen above shining, with fine sparse punctiu'es. 



Antenna3 thickish, shorter than abdomen antimis, Kl. <? . 



— Apical segments of abdomen above very finely rugulose, only slightly 



shining. Antennae slender, fully as long as abdomen... 



ferrurjatus, Lep. J . 



8. Side lobes of mesonotiim entirely l)lack. Saw-sheath viewed from above 



narrow at the apex (hardly wider than one of the adjoining "cerci"!) 



ferrucjatus, Lep. 9 • 



— Side lobes of mesonotum more or less red in front (at the corners) and in 



the region of the tegulte. SaAv-sheath pretty strongly dilated towards 

 its apex and evidently much wider than the "cerci." ...anticus, Kl. 9 • 

 n. Mesonotmn (wholly or for the most part) scutellum (often) and abdomen 

 from the 2nd dorsal plate to the apex (nearly alwa3^s) red 10. 



— Thorax (except sometimes the tegvolae) without red. Al:)domen always 



black at apex 11. 



10. Antennaj long and tapering (their middle joints twice as broad, viewed 



laterally, as the apical). Wings with a slight inky tinge. Tempera 

 with deep fiu-rows running along their occipital margins, and quite 

 black (without bronzy reflections)... p?'aiensis, L. 9 ■ {=,t\dviventris,C). 



— Antenna short and filiform (i.e., the middle joints are not mucli liroader 



than the apical). AVings clear or slightly brownish-yellow (but not 

 tinged with inky-black). Tempora with very sliglit shallow fiuTOws, 

 somewhat shining between their sparse punctures and with bronzy 

 metallic i-eflections in cei"tain lights sericeps, Thoms. 9 • 



11. The red basal segments of the abdomen ai-e quite smooth and shining. 



Length of body not exceeding 8 mm 12. 



— Red liasal segments of abdomen dull, with a transverse striatiou. Much 



laiger forms about 10-12 mm. long 13. 



12. Puncturation of mesonotiTm sparse and ix'regiUar pratensis, L.S- 



and sericeps. Thorns. <? . 

 (These c? c? may be separated by the characters given above for their 9 9)- 



— Pi^ncturation of mesonotmn and breast close and even Antennoe long (as 



in pratensis) but filiform (as in sericeps) palusiris, Kl. g and 9 . 



