I9I4-] F. F. Laidlaw : Odonata. 345 



43. Ceriagrion coromandelianum (Fabr.) (PI. xvi, figs. 8, 8a.) 



r cf , 4 9 9 Dibrugarh, N. E. Assam, Abor Rxpedition, 

 17 — 2i-xi-ii (5. W. Kemp). 

 lycngth of abdomen 0' 35 mm. 9 32*5 mm, 

 ,, hind-wing cf 26 mm. 9 2i"5 mm. 



Considerably larger than the type which has the abdomen 

 28-30 mm. long. These specimens agree in other particulars and 

 are, I believe, rightly to be ascribed here. The male is, however, 

 without broad light brown band on the head between the eyes. 

 The upper pair of anal appendages is almost black. The females 

 are of a duller colour than the male, a sandy or tawny-yellow, 



44. Ceriagrion olivaceum, sp. nov. (PI. xvi, fig. 9.) 



2 cf cf , 2 9 9 Kachin Hills, Upper Burma {Capt. Topin). 

 Length of abdomen cf 38*5 mm. 9 39 mm. 

 ,, hind-wing cf 25 mm. 9 25 mm. 



Fourteenth and fifteenth antenodal cross nerves on fore-wing. 

 Pterostigma brown, covering rather more than one cell. 



cf Head, under surface pale yellowish-brown, upper surface 

 entirely brown with a somewhat green shade, the brown of the 

 upper lip of rather a warmer tinge. Second joint of antennae 

 black at its apex, the distal parts also black. 



Prothorax brown with a slight olive shade on the sides, paler 

 below. Thorax brown above, with a darker rather green ante- 

 hum.eral stripe on either side not reaching the summit of the thorax. 

 Laterally the thorax is olive-green with a brown metepisternal 

 area. Beneath it is pale olive-green, rather pulverulent. The legs 

 are pale brown, with the spines and articulation of the tarsal joints 

 brownish-black. 



Abdomen dull brown above, progressively darker to the end 

 of 8 ; 9 and 10 a little lighter, 10 with its posterior margin embayed 

 angularly. 



Anal appendages brown, lower pair black at the apex, upper 

 pair rather shorter than the lower pair, curved a little downwards. 

 Lower pair ending in an upwardly directed spur. 



9 Colouring in general very similar to that of the male but 

 duller, the pterostigma is paler; moreover this sex appears to lack 

 the antehumeral band on the dorsum of the thorax. 



This species, which appears to be quite distinct from its con- 

 geners, differs from them in its greater size; so far as I know it is 

 certainl}^ the largest species of the genus. 



Most nearly related to it I believe is C. coromandelianum, 

 Fabr, This latter species is different in general appearance, being 

 of a pale almost lemon- yellow, judging from the spirit specimen of 

 the male, which is also without the antehumeral stripe; whilst 

 the anal appendages are widely different, as is the shape of the 

 posterior dorsal margin of the tenth abdominal segment. The 

 females of C. coromandelianum referred to above bear a very strong 

 resemblance to the female specimens of C. olivaceum, they differ 

 especially in size, in the lesser number of post-nodal nerves, lo-ii 



