CY R. J. TILLYAKD. 369 



Key to Species of Ghoristhemis. 



C Medium size, metallic-black and bright yellow, no 



J antehumeral thoracic stripes C. flavoterminata. 



"j Small size, duller black and creamy, a pair of straight 

 ' antehumeral thoracic stripes C.olivei. 



1. Ghoristhemis flavoterminata Martin. (Plate v., fig 12). 



Synthemis flavoterminata Martin, Mem. Soc Zool. France, 1901. 



$. Total length 46, abdomen 36, hindwing 31 mm. 



Wings hyaline in mature insect, tinted with brownish-yellow 

 ill teneral specimens; pterostigma 2-5 mm., black. Head: eyes 

 bright greenish in living insect; vertex black; front slightly cleft, 

 bright yellow; postdypeits black, anteclypeus yellow; labrum jet 

 black; labium yellowish-brown. Thorax: prothorax black 

 with a large yellow dorsal spot. Meso- and metathorax metallic 

 steely or greenish-black; dorsal ridge yellow, two round yellow 

 spots near interalar ridge; sides with a broad irregular lateral 

 band, a small round spot low down in front, and a large area on 

 metapleuriim, all bright lemon-yellow; notum black, with yellow 

 scute] la and scuta; legs black, basal half of profemora yellow. 

 Abdomen black spotted with lemon-yellow as follows — 1, either 

 a dorsal cross, or a dorsal and two lateral spots; 2, a dorsal cross 

 or fleur-de-lys; auricles yellow; genital aperture surrounded with 

 yellow; 3-4, basal half yellow enclosing an elongated dorsal mark; 

 5-7, a pair tif small basal spots, a pair of small central spots, both 

 decreasing in size from 5 to 7; 8, two small basal spots or points; 

 9-10 very variable, but mostly yellow; sometimes clear, some- 

 times with black suture or spots, or a black W-mark. Append- 

 ages: superior 2 mm., black, narrow subcylindrical, tips some- 

 what blunt, downy; inferior two-thirds as long, subtriangular, 

 tip truncate, slightly upcurved, black (Plate vii., figs. 13a and h). 

 Genital aperture of segment 2, viewed in profile, is figured, 

 (Plate vii., fig. 15). 



9. Similar to male; expanse of wing greater; wings usually 



sufi'used with pale yellowish-brown. Head and thorax as in male, 



except front, which is black with a large yellow spot on each 



side. Abdomen cylindrical, much stouter than in male; marked 



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