448 M. W. R. de V. GRAHAM 



broad ; scape reaching slightly above the vertex. Head and thorax golden 

 to bronze-green, or coppery ; gaster with a pale subbasal spot, sometimes 

 also partly pale ventrally .... febriculosus (Girault) (p. 453) 



Antennae with combined length of pedicellus and flagellum at most 1-7 times 

 the breadth of the head ; flagellum relatively less slender ; funicular segments 

 relatively shorter, the distal segments sometimes not longer than broad ; 

 scape not reaching above the vertex. Head and thorax often more obscurely 

 metallic ; gaster sometimes immaculate ....... 4 



4 (3) Antennae with combined length of pedicellus and flagellum 1-6-1-7 times the 



breadth of the head ; all funicular segments very distinctly longer than 

 broad, even the sixth 17 to 2 times as long as broad. Head and thorax 

 mainly green. Marginal vein of fore wing about twice as long as the stigmal 

 vein. Both mandibles with four teeth . . . arestor (Walker) (p. 452) 



- Antennae with combined length of pedicellus and flagellum at most 1-4 times 



the breadth of the head ; funicular segments relatively shorter, the sixth at 

 most 1-5 times as long as broad, sometimes quadrate or very slightly trans- 

 verse. Head and thorax dark blue or dark greenish blue .... 5 



5 (4) Fore wing with marginal vein twice, or rather more than twice, as long as the 



stigmal vein ; venation yellowish. Scutellum rather shiny. Antennae with 

 scape shorter than the transverse diameter of an eye and not nearly reaching 

 the median ocellus, slightly expanded above the middle ; funicular segments 

 short, the first at most slightly longer than the pedicellus, sixth subquadrate. 

 Malar space more than half the length of an eye. Both mandibles with four 

 teeth ........ fulviventris (Walker) (p. 454) 



Fore wing with marginal vein 1-5 to 1-75 times as long as the stigmal vein ; 

 venation yellow to fuscous. Scutellum duller. Antennae with scape nearly 

 or quite as long as the transverse diameter of an eye, nearly or quite reaching 

 the median ocellus ; funicular segments sometimes relatively longer. Left 

 mandible often with three teeth ........ 6 



6 (5) Antennae with combined length of pedicellus and flagellum 1-3 to 1-4 times the 



breadth of the head ; flagellum rather slender ; scape reaching the median 

 ocellus, not expanded above the middle, without a shiny boss, usually partly 

 or wholly testaceous ; sixth funicular segment about 1-5 times as long as 

 broad. Both mandibles with four teeth . . . destructor (Say) (p. 450) 



Antennae with combined length of pedicellus and flagellum 11 to 1-15 times the 

 breadth of the head ; flagellum tending to be thicker ; scape hardly reaching 

 the median ocellus, slightly expanded above the middle and with a shiny boss 

 which extends about half way down, black ; sixth funicular segment quadrate 

 to 1-3 times as long as broad. Left mandible usually with three teeth (with 

 four in aberrant luniger) .......... 7 



7 (6) Thorax nearly twice as long as broad ; pronotal collar not margined. Tibiae 



infuscate medially, usually broadly so ... . luniger (Nees) (p. 450) 



Thorax about 1-7 times as long as broad ; pronotal collar slightly margined 

 medially. Tibiae yellow, or at most the hind tibiae at all distinctly infuscate 

 medially ........ subniger (Walker) (p. 451) 



8 (2) Marginal vein of fore wing distinctly thickened, five to six times as long as its 



maximum breadth, i-i to 1-3 times as long as the stigmal vein ; wing usually 

 with a distinct fuscous cloud below the marginal vein 



chalcidiphagus (Walsh & Riley) (p. 449) 

 Marginal vein of fore wing only slightly thickened, about eight times as long as 

 its maximum breadth, 1-2 to 1-45 times as long as the stigmal vein ; wing 

 immaculate or with only a weak and diffuse cloud below the marginal vein 



apharetus (Walker) (p. 449) 



