156 M. W. R. de V. GRAHAM 



long as eyes, if nearly or quite half as long then gastral petiole strongly 

 transverse or smooth. Median area of propodeum sometimes weakly sculp- 

 tured or smooth. Gastral petiole often transverse ..... 2 



2 (1) Thorax i-8 to 2 times as long as broad, somewhat flattened ; scutellum in 



profile appearing fiat or virtually so. Gaster lanceolate, slightly longer 

 than head plus thorax, 2 -8 to 3 -2 times as long as broad ; last tergite as long 

 as or somewhat longer than its basal breadth. Median area of propodeum 

 strongly reticulate and relatively dull . . . collaris (Walker) (p. 159) 



Thorax less elongate, more arched dorsally ; scutellum in profile appearing at 

 least slightly convex. Gaster at most 2-5 times as long as broad ; if as elon- 

 gate as this, then the median area of the propodeum is weakly sculptured and 

 shiny ............ 3 



3 (2) Gastral petiole slightly longer than broad, reticulate, with nearly parallel 



sides, with three to six hairs on each side. Antennae with funicular seg- 

 ments quadrate, or the proximal ones very slightly longer than broad. 

 Median area of propodeum with distinct reticulation 



patellana (Dalman) Thomson (p. 160) 



- Gastral petiole usually bare at the sides ; if with one or two hairs then the 



petiole is either transverse, or subconical and nearly smooth. At least some 

 of the funicular segments transverse. Median area of propodeum shiny ; 

 with weaker reticulation, or mainly to entirely smooth .... 4 



4 (3) Gastral petiole (Text-fig. 129) smooth or with some very weak sculpture, 



subconical, as broad as or slightly broader than long. Lower edge of 

 antennal toruli distinctly above level of ventral edge of eyes. 



Flagellum distinctly stouter than the pedicellus, hardly clavate ; funicular 

 segments, except sometimes the first, at least very slightly transverse. 

 Gaster rhomboid, slightly longer than the thorax. Large species, 2-5 to 

 3 mm. ........ hippeus (Walker) (p. 161) 



Gastral petiole either wholly reticulate, or else about twice as broad as long ; 

 usually with subparallel sides (this feature is not so obvious in species with 

 strongly transverse petiole) . Lower edge of antennal toruli at or hardly above 

 level of ventral edge of eyes ........ 5 



5 (4) Gaster 2 to 2-5 times as long as broad, about as long as head plus thorax ; 



antennal funicle with proximal segments subquadrate, distal segments only 

 slightly transverse ; gastral petiole slightly broader than long 



laevigata Thomson (p. 160) 



- Either the gaster is less than twice as long as broad, and not longer than the 



thorax ; or all the funicular segments are transverse, the distal ones 

 strongly so. Gastral petiole varying from strongly transverse to slightly 

 longer than broad .......... 6 



6 (5) Gastral petiole distinctly (up to 2-5 times) broader than long, distinctly shorter 



than the median length of the propodeum. Gaster often about twice as 

 long as broad or rather more, usually longer than the thorax ... 7 



Gastral petiole quadrate to somewhat longer than broad, not or hardly shorter 

 than the median length of the propodeum. Gaster less than twice as long 

 as broad, not longer than the thorax . . . . . . .11 



7 (6) Gaster 1 -5 to 1 -7 times as long as broad, not longer than the thorax. Antennal 



flagellum distinctly clavate, proximally hardly stouter than the pedicellus 



but thickening distad. Small species, 1-3 to i-8 mm. poreia (Walker) (p. 162) 



- Gaster 1 -85 to 2-5 times as long as broad, longer than the thorax, sometimes as 



long as head plus thorax. Antennal flagellum hardly clavate, proximally 

 at least slightly stouter than the pedicellus. Species usually larger 

 (size i-8 to 4 mm.) .......... 8 



