BY R. J. TILLYARD. 347 



In the coloured plate, the differences of colouration are very 

 carefully shown, and the two species placed side by side for 

 comparison of size also. 



3. Synthemis kegina Selys. (Plate iv., Hg.3). 



Selvs, loc. cit. 1874. 



(J. Total length 57-60 mm , abdomen 45-47 mm., hindwing 

 33 mm. 



Wings: costa pale yellowish outwards; pterostigma 2 mm., 

 black, memhranule 2mm., narrow, whitish. Head : e?/e« deep 

 green in living insect; vertex black; front hairy, cleft medially, 

 3'ellow above, marked with a broad black T-mark, the stem of 

 which lies in the median cleft; face of front black, surrounded 

 above and on sides with yellow, the lilack centre being nearly 

 rectangular; c/ypeits pale yellow; /«6?'Mm black, with a pair of pale 

 yellow or creamy spots separated by a black bar; labium pale 

 dirty flesh-colour, gence black, inouth edged with black. Thorax: 

 prothorax black, a yellow collar in front, a large yellow 

 mark behind. Meso- and metathorao; black or very dark brown 

 with deep metallic bluish or greenish I'eflections; a conspicuous 

 yellow line along dorsal ridge; no dorsal hands. On each side a 

 broad band of lemon-yellow enclosing the mesospiracle; below 

 this a narrower band of the dark ground-colour, rest of sides bright 

 yellow; legs black, profemora pale yellow lined with black above; 

 underside of metatibiee ridged with pale grey; notum black, scuta 

 and scutella yellow. Abdomen very long and slender, 1-2 

 enlarged, 3 very narrow, widening to 7, 8-9 again pinched 

 Colour deep shining black, marked with light lemon-yellow as 

 follows — 1, a dorsal spot, also yellow on sides; 2, two slanting 

 basal marks nearly touching, auricles yellow, genital aperture 

 largely surrounded with yellow; 3-5, a pair of subtriangular 

 basal spots almost touching, a pair of suboval central spots, 

 somewhat pointed basally, separated dorsally by a line black line; 

 these spots are smallest and closest to base in 5; 6 wath basal 

 spots small, central spots flat and distant only one-third from 

 base; 7 nearly all bright yellow, caused by the fusion of two 



