3 go M. W. R. de V. GRAHAM 



12 (n) Marginal vein of fore wing (cf. Text-figs. 285, 286, 323, 324) conspicuously 



thickened throughout, usually only three to five (occasionally six) times 



as long as broad, sometimes a little thicker at its apex than at its base . 13 



— Marginal vein of fore wing either not or only slightly thickened, at least about 



seven times as long as broad ; or else thickened only in its proximal half . 24 



13 (12) Antennal formula 11353 ; postmarginal vein of fore wing not or hardly 



longer than the marginal vein ; notauli incomplete 



MESOPOLOBUS Westwood (p. 638) 



— Either antennal formula 1 1262 ; or else the postmarginal vein of the fore wing 



is nearly to quite 1-5 times as long as the marginal vein. Notauli some- 

 times complete . . . . . . . . . . .14 



14 (13) Mesepisternum wholly reticulate ; pronotal collar not margined. 



Notauli usually traceable to hind margin of mesoscutum, but super- 

 ficial posteriorly . . . PACHYCREPOIDEUS Ashmead (p. 846) 



— Mesepisternum with a mainly to entirely smooth subtriangular area below the 



base of the hind wing. Pronotal collar sometimes margined . . . 15 



15 (14) Notauli complete, deep throughout ; stigma of fore wing moderately large ; 



anterior margin of clypeus angularly produced medially 



CO RUN A Walker (p. 845) 



— Notauli incomplete ; stigma large or small ; anterior margin of clypeus of 



varied form, sometimes emarginate . . . . . . . 16 



16 (15) Pronotal collar margined, at least in the middle, but often throughout . 17 



— Pronotal collar not margined . . . . . ... 19 



17 (16) Clypeus reticulate ; hind coxae hairy dorsally in their basal half ; genae 



rounded ; fore wing with parastigma conspicuously thickened, stigma 

 large, often surrounded by a fuscous cloud (cf. Text-fig. 324) 



DINOTISCUS Ghesquiere (p 409) 



— Clypeus striate ; hind coxae bare dorsally in their basal half ; genae most 



often compressed with a sharp edge near the mandibles ; fore wing with 

 parastigma not conspicuously thickened, stigma smaller . . . 18 



18 (17) Antennae with combined length of pedicellus and flagellum hardly equal to 



breadth of head ; flagellum subclavate, funicular segments subquadrate. 

 Gaster convex dorsally ; second tergite slightly shorter than the third 



EUNEURA Walker (p. 843) 



— Antennae with combined length of pedicellus and flagellum at least slightly 



greater than breadth of head ; flagellum filiform ; funicular segments 

 sometimes longer than broad. Gaster usually sunken or flat dorsally ; 

 second tergite as long as or longer than the third 



PACHYNEURON Walker (p. 830) 



19 (16) Antennae having first anellus longer than broad, longer than the second 



anellus. Pronotum more or less, and all coxae, yellow 



PANDELUS Forster (p. 422) 



— Antennae having anelli at least slightly transverse. Pronotum, and often 



coxae, dark ........... 20 



20 (19) Fore wing (Text-fig. 324) with parastigma conspicuously thickened, at its 



broadest part, almost as broad as the marginal vein ; stigma very large, 

 separated by hardly more than its own height from the costal edge of the 

 wing, surrounded by a fuscous cloud. Hind coxae pilose dorsally, virtually 



to their bases ACROCORMUS Forster (p. 415) 



Parastigma usually not thickened, if slightly so then the stigma is smaller ; 

 if the fore wing has a fuscous cloud then it is situated below the marginal 

 vein ............ 21 



2 1 (20) Antennae with flagellum at least slightly clavate ; combined length of pedicel- 



