640 M. W. R. de V. GRAHAM 



as broad as long. Breadth of oral fossa about i-8 times the malar space. 

 Gaster nearly as long as head plus thorax, 1-7 to 2 times as long as broad. 

 Antennae with scape reaching or virtually reaching the median ocellus ; 

 first funicular segment as stout as, or even a little stouter than, the pedicellus 

 when the latter is seen in profile. Scutellum very slightly longer than broad 



Sturovia albitarsus (Walker) (p. 638) 



3 (1) Genae (Text-fig. 525) converging strongly towards the oral fossa, the breadth 



of the latter only about 1 -5 times the malar space. Marginal vein only 1 -25 

 to 1-5 times as long as the stigmal vein. Pronotal collar not distinctly 

 margined. Mesoscutum with several shallow but distinct piliferous punc- 

 tures ............ 4 



Either the genae converge (Text-fig. 527) less strongly so that the breadth of 

 the oral fossa is nearly or quite twice the malar space ; or else the marginal 

 vein is about twice as long as the stigmal vein. Pronotal collar often 

 margined. Mesoscutum sometimes without piliferous punctures . . 5 



4 (3) Tip of hypopygium situated somewhat beyond the middle of the gaster ; the 



latter long-oval, i-8 to 2-4 times as long as broad, usually slightly longer 

 than, occasionally only as long as, head plus thorax incultus (Walker) (p. 654) 

 Tip of hypopygium situated about in the middle of the gaster ; the latter 

 broad-oval, 1-35 to i-6 times as long as broad, usually only slightly longer 

 than the thorax, occasionally as long as head plus thorax morys (Walker) (p. 653) 



5 (3) Antennae inserted distinctly above the level of the ventral edge of the eyes, 



their toruli only slightly nearer to the anterior margin of the clypeus than 

 to the median ocellus. Breadth of oral fossa only about 1-7 times the 

 malar space. Pronotal collar not sharply defined in front. Marginal vein 

 of fore wing about twice as long as the stigmal vein aequus (Walker) (p. 655) 

 Antennae usually inserted lower, so that the lower edge of their toruli is about 

 at the level of the ventral edge of the eyes ; if inserted a little above this 

 level, then still distinctly nearer to the anterior margin of the clypeus than 

 to the median ocellus, and the pronotal collar with a sharp front edge, or 

 margined ............ 6 



6 (5) Hind margin of scutellum with a tubercle or small tooth in the middle ; 



frenum distinctly marked off from the rest of the scutellum, except some- 

 times just in the middle, by an impressed line. Median area of propo- 

 deum nearly always with a transverse ridge (costula) a little in front of the 

 nucha. Antennae, except in dwarfs, with two anelli and six funicular seg- 

 ments. Gaster lanceolate, longer than head plus thorax. Marginal vein 

 2 to 2-5 times as long as the stigmal vein . . . phragmitis (Erdos) (p. 664) 



- Hind margin of scutellum without a tubercle or tooth ; frenum not distinctly 



marked off by an impressed line, except just at the sides. Median area of 

 propodeum without a costula, though sometimes with oblique wrinkles. 

 Antennae most often with three anelli and five funicular segments. Gaster 

 and marginal vein often relatively shorter ...... 7 



7 (6) Fore wing : distal third to half of basal cell, on upper surface of wing, pilose. 



Small (2 to 2-3 mm.) species ; propodeum only about one third as long as the 

 scutellum, with plicae sharp only posteriorly, otherwise weak or absent ; 

 upper triangular area of mesepisternum smooth ; gaster lanceolate, longer 

 than head plus thorax, with ovipositor sheaths very distinctly exserted, to 

 about the length of the first segment of the hind tarsus anogmoides sp. n. (p. 678) 



- Basal cell of fore wing usually bare ; if conspicuously pilose distally, then 



larger and less slender species, with propodeum relatively longer and having 

 its plicae distinct throughout, the upper triangular area of the mesepisternum 

 mainly reticulate, and the ovipositor sheaths hardly exserted ... 8 



