BRITISH ICHNEUMONS. 237 



(14). '7. Clypeus, with no central depression 

 before its apex. 



Areolet entire. 



Epistoma not elongate ; clypeus dis- 

 tinctly discreted. 



Lower mandibular tooth very small ; 

 nervellus antefurcal 2. Herpestomus, Wcs/zi. 



Lower tooth normal ; nervellus post- 

 furcal or opposite 3. FUAEOGEiiES, IVesm. 



Epistoma not transverse ; clypeus not 

 or hardly discreted 4. BwDROSWfi, IVesm. 



Areolet apically interstitial 5. Epitomus, /^9>.y/'. 



Clypeus with a distinct central de- 

 pression before its apex. 



Epistoma not transverse ; clypeus 

 broadly excavate apically 6. OlORHlNUS, IVcsm. 



Epistoma not elongate ; clypeus, with 

 at most an apical fovea 7. Aethecerus, IVesm. 



Second segment with no basal impres- 

 sion. 



Head normal ; nervellus antefurcal or 

 opposite 8. DiCAELOTUS, IVesm. 



Head buccate ; nervellus post-furcal. 



Mandibles of $ sinuate below ; (J fla- 

 gellum not basally attenuate 9. ColpoGNATHUS, JF'^JW. 



Mandibles of 9 not sinuate ; ^ flagel- 

 lum basally attenuate 10. Centeterus, ^^j;«. 



Metathorax apically produced above 

 coxae, sub-caudate 11. Oronotus, Wes/u. 



Scutellum distinctly elevated, gibbous. 



Anus acute ; terebra straight 12. IscHNVS, Grav. 



Anus obtuse ; terebra reflexed 13. Heterischnus, if'F^.s-w. 



Mandibular teeth of equal length, or 

 frons nitidulous and nearly glabrous. 



Abdomen scabrous ; intermediate 

 coxae sub-globose 14. Trachyarus, Thovis. 



Abdomen punctulate ; coxae normal 

 or elongate. 



Metanotum areated ; frons punctate... 15. Hemichneumox, JFt'j-w. 



Metanotum not areated ; frons 

 glabrous. 



Areolet complete ; metanotum gradu- 

 ally declived 16. Nematomicrus, rf'i'.s'///. 



Areolet incomplete ; metanotum 

 abruptly declived 17. Melanomicrus, Mori. 



APAELETICUS, Wesmael. 



Wesm. Nouv. Mem. Ac. Brux. 1844. p. 165. 



Head somewhat tumidous, narrowed towards the mouth and behind 

 the eyes ; epistoma convex ; clypeus sub-quadrate, sub-discreled, convex, 

 smooth or sparsely punctate ; mandibular teeth unequal. Antennae sub- 

 filiform, sometimes incrassate ; basal flagellar joint cylindrical. Thorax 

 somewhat strongly punctate ; notauli distinct ; metanotum rugose, dis- 

 tinctly areated and bidentate, with the costulae entire ; mesopleurae 

 shortly sulcate ; spiracles circular. Scutellum convex, usually margined to 

 its middle. Abdomen ovate-lanceolate, in ? apically sub-truncate and 



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 (31 



