138 BRITISH ICHNEUMONS. [ Mesoleius 

(1). 10. Metanotal areae not entirely wanting ; 
basal nervure vertical; anal ner- 
vure not emitted below centre of 
brachial cell. 
(12). 11. Scape very small, basal flagellar joint 
large with discal protuberance .. 6, BRACHYACANTHUS, Par, 
(11). 12. Scape and basal flagellar joint nor- 
mal. 
(14). 13. Nervellus postfurcal, intercepted 
above centre; mesopleurae regu- 
larly punctate, with interstices 
glabrous[OTLOPHORUS, Thoms.]. 7. VEPRETORUM, Grav. 
(13). 14. Nervellus not postfurcal, intercepted 
at or below centre; mesopleurae 
irregularly punctate, with inter- 
stices nearly always alutaceous. 
(28). 15. Basal flagellar joint at least half as 
long again as second; thorax 
deplanate. 
(21). 16. Notauli obsolete; petiolar spiracles 
central [ LARGAROTUS, Thoms. ]. 
(20). 17. Clypeus apically subtruncate and 
depressed; antennae not red. 
(19). 18. Thorax immaculate, with a 
traceable notauli .. . 8. SEMICALIGATUS, Grav. 
(18). 19. Thorax pale at radices, with some- 
what obsolete notauli “e . Q. FALLAX, Holmgr. 
(17). 20. Clypeus apically emarginate and not 
depressed ; antennae at least 
apically red sa a .. 10. ERYTHROCERUS, Grav. 
(16). 21. Notauli distinct; petiolar spiracles 
before centre [SCOPESUS, Thoms. ] 
(27). 22. Hind tarsi nigrescent ; abdomen 
mainly red; apical maxillary pal- 
pal joint not longer than penulti- 
mate. 
(26). 23. Clypeus apically depressed and not 
nasutely produced centrally; peti- 
olar sulcus wanting; nervellus 
opposite. 
(25). 24. Hind femora rufescent; ¢@ humeral 
pale marks obsolete a .. Il, RUFOLABRIS, Zezz. 
(24). 25. Hind femora black; @ humeral 
marks broadly flavous .. 12. BICOLOR, Grav. 
(23). 26. Clypeus apically not produced ; peti- 
olar sulcus obsolete ; nervellus 
antefurcal .. . 13. RUFONOTATUS, Holmgr 
(22). 27. Hind tarsi and abdomen ‘flavous ; 
apical maxillary palpal joint 
longer than penultimate 14. NIGRICOLLIS, Grav. 
(15). 28. Basal flagellar joint not or hardly 
longer than second; thorax nor- 
mal. 
(78). 29. Body always distinctly punctate and 
discally dull; abdomen not or 
only apically compressed; length, 
mm. or more [ MESOLEIUS, 
Thoms. ]. ; 
