THE SUBFAMILY LIBELLULIN'^E. 345 



Fylla exigua. (Plate LII. fig. 6.) 

 ? Nannophya exigua, Hag. MS. 



Long. corp. 16 millim. ; exp. al. 24-28 millim. ; long. pter. 1 raillim. 



Head testaceous above ; the lower mouth-parts and the back of the head, except the 

 occipital triangle, entirely black. Thorax black above and below, the sides testaceous, 

 with a broad black perpendicular stripe below the front wings, and a small black spot 

 before and behind it ; the testaceous colour meets on the back in front of the wings, 

 and in one female specimen it is more extended on the back of the thorax. Legs 

 black. Abdomen (except the first segment, which is black) bright scarlet in the male, 

 but frequently discoloured ; in the female the abdomen is brown, with black carinse 

 and sutures, and the last three segments entirely black, and in the most highly-coloured 

 specimen the space behind the carinse on the 2nd and 3rd segments and a spot on each 

 side of the 5th and 6th segments in front are whitish. Wings hyaline, with black 

 nervures; pterostigma brown, between thick black nervures, base of the wings tinged 

 with yellow as far as the triangles, in the female this is much fainter, and is confined 

 to the hind wings ; membranule very small, whitish. 



Bab. China, Borneo (very common), Bouru, Gilolo, and Morty. 



EXPLANATION OF THE PLATES. 



All the figures are original, and have been drawn on stone from specimens in the 

 collection of the British Museum by Messrs. Green and Mintern, under the personal 

 supervision of the author. The figures on the first four Plates are of the natural size ; 

 those on the last three, representing neuration and details, are twice the natural size. 



It is to be regretted that it has been found impossible, without very large additional 

 outlay, to give the exact colouring of the wing-veins, for which the descriptions of the 

 species themselves must be consulted. 



PLATE LI. 



Fig. 1. Tramea darwinii, ? , p. 315. 

 Fig. 2. Fylgia amazonica, d , p. 344. 

 Fig. 3. Fylgia amazonica, 6 (immature), p. 344. 

 Fig. 4. Antidythemis trameiformis, 6 , p. 315. 

 Fig. 5. Rhyothemis apicalis, ? , p. 319. 

 Fig. 6. Rhyothemis cuprina, 2 , p. 320. 

 Fig. 7. Perithemis intensa, <5 , p. 326. 

 Fig. 8. Perithemis bella, 6 , p. 324. 

 Fig. 9. Perithemis bella, ? , p. 324. 

 Fig. 10. Hydrobasileus vittatus, <s , p. 314. 

 vol. xii. — part ix. No. 13. — August, 1889. 3 d 



