1915. ] F. F. LaiwLiaw : Oriental Dragonflies. 389 
Platysticta hilaris (Hagen). 
Platysticta hilaris, Kirby, Cat. Odonata, p. 132 (1890). 
; 5 id., F. Linn. Soc. XXIV, p. 562 (1893). 
so 1 G, Kandy, Ceylon, 21-i-10. 
The prothorax in this specimen appears to be uniformly dark 
on the dorsal surface. The middle lobe of the prothorax carries a 
pair of small rounded bosses, one on either side of the middle line. 
The colouring of the abdominal segments is evidently much faded, 
but the specimen is, I believe, identical with that described in de 
Selys’ synopsis under this name. 
Protosticta gravelyi, sp. n. 
(Text-fig. 2.) 
8231 7 ¢ 1 2, Kavalai, 1300-3000 ft., Cochin State, 24—27-ix-14 (spirit 
specimens). 
@?. Length ot body 44 mm., of hind-wing 21 mm. 
Head, under surface brownish black, upper lip, genae and 
anteclypeus white, the upper lip with a fine black margin, the 
rest of the dorsal surface black. 
Prothorax white; a black triangle occupies the posterior lobe 
and its apex extends forward on to the middle lobe. Thorax black, 
with a metallic lustre on the dorsum; laterally marked with two 
moderately broad bands of white, of which the anterior encloses 
the stigma; ventral surface black, but the infra-episternum is white. 
Abdomen, segments 1-2 black above, sides and ventral sur- 
faces white, but the genital appendages on 2 are tinged with dark 
brown. Segments 3-7 each with a 
white sub-basal ring, which laterally 
and ventrally is more extensive than 
it is dorsally. In the case of segment 
7 the white mark is divided dorsally 
by a fine longitudinal line which is 
black, and it occupies about the first 
third of the dorsum of the segment; x 
. : Fic. 2.—Anal appendages 
ventrally it extends for two-thirds of of Pyotosticta gravelyt 3, 
the length of the segment. On end of seen from the side. 
segments 3-6 the white mark is much 
less extensive occupying only a small fraction (one-tenth or less) 
of the dorsum of the segment. There are no markings on segments 
8-10 which are entirely black. 
The relative length of the abdominal segments is as follows: 
Laer Oe sOr ee? LO: 784743)" Li-§. 
nN 
Legs white, with black ridges and cilia. 
Anal appendages about twice as long as segment Io. Upper 
pair stout at their bases with a small angular projection on their 
inner side; curved inwards and downwards, strongly chelate at 
their distal extremities. Tower pair rather slender, simple, curved 
