586 M. W. R. de V. GRAHAM 



- Clypeus strigose, except sometimes in the middle. Antennae longer, com- 



bined length of pedicellus and flagellum distinctly greater than breadth of 

 head ; none of the funicular segments, or at most the fifth and sixth, trans- 

 verse, the proximal segments nearly always elongate, rarely nearly quad- 

 rate ; first funicular segment usually as long as or longer than the pedicellus, 

 rarely slightly shorter ; scape usually equal in length to the clava, occasion- 

 ally slightly longer ; clava 2-3 to 2-5 times as long as broad. Gaster 

 ovate-lanceolate to lanceolate, at least somewhat, usually very much, 

 longer than the thorax, its last tergite not shorter than its basal breadth ; 

 tip of hypopygium situated at least slightly less than half the length of the 

 gaster. Spur of mid tibia less than half as long as the first tarsal segment. 

 Length usually greater ; median carina of propodeum usually distinct . 2 



2 (1) Gaster (Text-fig. 436) 2-2 to 2-4 times as long as the thorax ; last tergite 



strongly compressed, in dorsal view appearing linear throughout most of its 

 length, which is nearly or quite one third that of the whole gaster, its proximal 

 half reddish. Fore wing with basal cell closed below throughout its length 

 by a line of hairs on the cubital vein. 



Head and pronotum much as in stenogaster (cf. Text-fig. 441) 



stylatus sp. n. (p. 589) 

 Gaster at most about twice as long as the thorax ; last tergite shorter, less 

 strongly compressed, in dorsal view tapering gradually from base to apex, at 

 most reddish at the base. Fore wing with basal cell open below, or at most 

 closed in the distal half by a line of hairs on the cubital vein ... 3 



3 (2) Antenna (Text-fig. 439) with sixth funicular segment at least slightly longer than 



broad, the segments proximal to this more distinctly elongate, first funicular 

 segment obviously longer than the pedicellus. Head in dorsal view (Text- 

 fig. 438) strongly transverse (2-4 to 2-5 times as broad as long), temples very 

 strongly convergent and very short ; vertex with only a weak transverse 

 ridge behind the ocelli ...... varro (Walker) (p. 589) 



- Antenna with sixth funicular segment quadrate to very slightly transverse, 



fifth subquadrate, fourth at most slightly longer than broad ; first funicular 

 segment at most slightly longer, sometimes even shorter, than the pedicellus. 

 Head in dorsal view usually less transverse, the temples often less conver- 

 gent ; often the vertex has a more distinct transverse ridge behind the ocelli 4 



4 (3) Vertex without, or with at most a very indistinct ridge behind the ocelli ; 



temples very strongly narrowed behind the eyes and the head strongly 

 transverse, almost as in varro cf. Text-fig. 438. Propodeum short, its 

 median length hardly more than one third that of the scutellum. Fore 

 wing with basal cell usually open below ; marginal vein 1 -6 to 1 -8 times as 

 long as the stigmal vein ; postmarginal distinctly longer than the stigmal. 

 Head and thorax usually bluish, less often bronze-, black. Pronotum as in 

 compressus (cf. Text-fig. 442). .... gorgasus (Walker) (p. 588) 



Vertex (Text-fig. 440) with a distinct, sometimes rather sharp, ridge behind the 

 ocelli ; temples usually less strongly narrowed, head usually less transverse. 

 Propodeum longer, slightly less than half as long as the scutellum . . 5 



5 (4) Gaster elongate, twice or nearly twice the length of the thorax, strongly acu- 



minate ; last tergite two to three times as long as its basal breadth, and 

 longer than the basal tergite. Pronotum (Text-fig. 441) with sides of 

 collar nearly parallel, slightly toothed anteriorly at the points where the 

 transverse carina (or " margin ") meets them ; the carina distinctly raised, 

 slightly angled towards each side, and usually with a short longitudinal 

 costula behind each angle .... stenogaster (Walker) (p. 590) 



Gaster shorter, distinctly less than twice the length of the thorax, less acu- 



