392 M. W. R. de V. GRAHAM 



31 (28) Penultimate segment of the yellow maxillary palpi with a long flattened 



subspatulate process. Head in dorsal view only i-6 to i-8 times as broad 

 as long ; thorax elongate, i-8 to 2-3 times as long as broad 



MESOPOLOBUS Westwood (p. 638) 



- Penultimate segment of maxillary palpi without a process, the palpi sometimes 



dark. Head usually relatively more transverse ; thorax often less 

 elongate ............ 32 



32 (31) Antennal scape (Text-fig. 331) excised in the middle of its front edge, and 



with a triangular projection above this STICHOCREPIS Forster (p. 822) 



- Antennal scape neither excised nor with a triangular projection . . . 33 



33 (3 2 ) Genae forming convex protuberances which, in frontal view of head, project 



conspicuously below the level of the anterior margin of the clypeus. Eyes 

 with long conspicuous hairs. 



Lower edge of antennal toruli, except in Halomalus, not or hardly above 

 level of ventral edge of eyes ; antennae yellow or testaceous with at most 

 the clava black .......... 34 



- Genae rarely produced ventrad of the clypeal margin ; if so, then not forming 



convex protuberances, and the eyes with short inconspicuous hairs, the 

 antennae sometimes extensively darkened ...... 36 



34 (33) Antennal flagellum subcylindrical, much stouter than the pedicellus ; all 



funicular segments transverse. Occiput sharp, or margined. Propodeal 

 nucha represented by a short, transversely-lunate strip which is very 

 weakly reticulate ; costula weak or irregular DIGLOCHIS Forster (p. 782) 



- Antennal flagellum clavate, proximally not stouter than the pedicellus ; at 



most some of the distal segments of the funicle transverse. Occiput 

 neither sharp nor margined. Propodeum with a moderate-sized or large, 

 strongly reticulate nucha ; costula strong ...... 35 



35 (34) Propodeum with hind corners with a small tooth ; callus densely pilose, the 



hairs also covering the supracoxal flange and even encroaching upon the 

 median area ; nucha moderate-sized . . PEZILEPSIS Delucchi (p. 782) 



- Propodeum with hind corners rounded off ; callus sparsely pilose ; nucha 



large, subglobose ..... HALOMALUS Erdos (p. 781) 



36 (33) Antennae (Text-figs. 334, 342, 343) with funicular segments separated by 



peduncle-like constrictions, and with whorls of outstanding hairs ; often 

 seven funicular segments, sometimes six . . . . . -37 



- Antennae with funicular segments more compacted, separated by incon- 



spicuous peduncles .......... 39 



37 (36) Antennae (Text-fig. 334) inserted high on the head, their toruli much nearer 



to the median ocellus than to the anterior margin of the clypeus, with scape 

 reaching far above level of vertex ; antennal formula 11263 ; propodeum 

 hardly half as long as the scutellum, its median area not uniformly 

 reticulate, without a costula, the nucha short APSILOCERA Boucek (p. 696) 



- Antennal toruli at most slightly nearer to the median ocellus than to the 



anterior margin of the clypeus ; scape reaching at most slightly above 

 level of vertex, if reaching above it then antennal formula 11272 ; pro- 

 podeum at least half as long as scutellum ...... 38 



38 (37) Gena with a hollow above the base of the mandible ; pronotum not as wide 



as the mesoscutum ; propodeum with a costula and the anterior part of 

 the plicae more or less indicated, nucha moderate-sized ; antennal 

 formula 11263 or 11272 (Text-figs. 342, 343) PSILOCERA Walker (p. 462) 



- Gena without such a hollow ; pronotum as wide as the mesoscutum ; pro- 



podeum without costula or plicae, nucha poorly-defined ; antennal 

 formula 1 1 272 NORBANUS Walker (p. 437) 



