The Odonaht or Dragonflies of South Africa. 291 



greenish. Pteiosti>iiiia heavy, opaque, cream to sulphur yellow ou 

 dorsal, almost pure white ou ventral side. 



? (adult). Very similar to male. Dark line on second lateral thoracic 

 suture somewhat indistinct, or present only on the dorsal half. 

 Whitish basal rings of abdominal segments narrower. Dorsal spot of 

 terminal segments hegiuuiug ou anterior half of segment 8, but duller, 

 more reddish brown. Ventral margin of tergites 8-9 lined with 

 yellowish, the line continuing to the dorsal half of valves. Tips of 

 valves slightly exceeding the abdominal end. 



Posterior lobe of prothorax raised in the middle, deeply divided in 

 two small rounded lobes, bent slightly forward ; on dorsal view this 

 raised part appears cut out of the entire lobe and bent forward over 

 its own base ; correspondingly on side view its base is anterior to the 

 margin by the height of the raised lobe except in the median line, 

 where the base is slightly projecting posteriorly. 



S, AM. 32, hdw. 22 to 35, p^. 25 mm. $ 31, 23 to 33, 25. 



The series of males from Barberton shows various stages of maturity ; 

 it is worth mentioning that the black line of the second lateral thoracic 

 suture appears gradually, and that the yellow colour of the wings is 

 also gradually developed from hyaline through light greenish shades. 

 The females from this locality have according to successive stages of 

 maturity the pterostigma light greyish to rather deep reddish brown, 

 sliowing no difference between dorsal and ventral side. But there is 

 no reason to consider such specimens as distinct from those with white 

 and yellow pterostigma. 



CHLOROCNEMIS (Selys, 1863). 



A small genus of tropical African spedes. 



The species here described is evidently a stranger to the South 

 African fauna, even at its extreme limits. 



Chlorocnemis Mabshalli, n. sp. 



British Museum : 1 <^ . Mazoe, 4000 ft., Mashoualaud (2i . ii . 1906, 

 G. A. K. Marshall). Coll. E. B. Williamson : 1 ^ , Umtali, 3700 ft., 

 Mashonalaud {id.). 



fj (adult). Labium whitish, pointed with black. Occiput black. 

 Labrum light blue, very narrowly lined with black. Anteclypeus 

 brown ; postclypeus black ; geuae black, but in part within the limits 

 of the blue frontal baud. 



Frous black ; a broad, complete light blue transverse band occupy- 

 ing nearly the anterior half of dorsum, to a very narrow black margin 



