650 M. W. R. de V. GRAHAM 



apical process on its external edge ; the tibia yellow with a reddish stripe or 

 stripes. Antennal flagellum stouter ; at least the fifth funicular segment 

 distinctly transverse, sometimes also the fourth and even the third . . 6 



6 (5) Mid tibia with a triangular blackish subapical process on its external edge ; fore 



tibia hardly swollen and not flattened, about five times as long as broad. 

 Antenna with funicle testaceous ; clava mainly brown to fuscous, rather 

 pointed apically, more than 1-5 times as long as broad ; third flagellar 

 segment often distinctly shorter than the fourth and often lacking sensilla 



xanthocerus (Thomson) (p. 675) 

 Mid tibia without a subapical process, though in tibialis with a circular black 

 callosity at apex on its outer edge ; fore tibia slightly to distinctly swollen, 

 sometimes flattened. Antenna with funicle usually having one or more of 

 its distal segments marked with black at least above ; clava large, black, 

 subobtuse apically, hardly 1-5 times as long as broad ; third flagellar 

 segment usually not or hardly shorter than the fourth and often with 

 sensilla ............ 7 



7 (6) Mid tibia with a circular black callosity at apex on its outer edge ; fore tibia 



expanded and flattened, hardly four times as long as broad. Antennae with 

 seventh flagellar segment subquadrate, slightly longer than the sixth or the 

 eighth, the latter less than twice as broad as long tibialis (Westwood) (p. 676) 

 Mid tibia without a black callosity ; fore tibia slightly swollen but not 

 flattened. Antennae with flagellar segments six to eight distinctly trans- 

 verse, eight about twice as broad as long, these segments subequal in length 



fuscipes (Walker) (p. 675) 



8 (4) Mid tibia slightly expanded and flattened, only about six times as long as 



broad ; length of mid tibial spur hardly as great as the maximum breadth 

 of the tibia. Gaster with a yellowish spot or transverse band ... 9 



Mid tibia neither expanded nor flattened, usually more than six times as long 

 as broad, if hardly more than six times, then the length of its apical spur 

 slightly greater than the maximum breadth of the tibia . . . . 10 



9 (8) Mid tibia with a dark stripe or spot on its inner edge. Hind wing often with 



two fuscous spots, which are sometimes joined ; sometimes one or both of 

 these spots are absent. Marginal vein 1-3 to 1 -45 times as long as the 

 stigmal vein. Upper triangular area of mesepisternum mainly or wholly 

 smooth. Small species, length 1-2 to 1-7 mm . diffinis (Walker) (p. 669) 



Mid tibia yellow. Hind wing immaculate. Marginal vein 1-7 to 1-9 times 

 as long as the stigma vein. Upper triangular area of mesepisternum having 

 its lower half or more finely reticulate. Larger species, length 2 to 3 mm. 



spermotrophus Hussey (p. 680) 

 10 (8) Antennae inserted relatively high on the head, their toruli hardly nearer to 

 the anterior margin of the clypeus than to the median ocellus. Marginal 

 vein 2-2 to 2-7 times as long as the stigmal vein. Antennae with combined 

 length of pedicellus and flagellum slightly greater than breadth of head ; 

 flagellum slender, proximally distinctly more slender than the pedicellus, 

 its third segment usually slightly longer than broad, quadrate in dwarfs, 

 the following segments, except the last one, usually at least slightly longer 

 than broad. ....... aequus (Walker) (p. 655) 



Antennae inserted relatively lower down, the lower edge of their toruli level 

 with ventral edge of eyes or only slightly above this, but the toruli always 

 distinctly nearer to the anterior margin of the clypeus than to the median 

 ocellus. Marginal vein i-o to 2-2 times as long as stigmal vein. Antennae 

 with combined length of pedicellus and flagellum at most equal to breadth 



