168 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVI 



Prothorax : olivaceous brown. 



Thorax : olivaceous brown with a broad, humeral, blackish stripe and a 

 broad lateral stripe covering most of the space between the ppiracle and 

 the metepimerou. 



Abdomen olivaceous brown with very broad, dark bordering stripes. The 

 abdomea relatively shorter and broader than in cancellatmn. 



Wings hyaline ; a golden yellow spot at the base extending nearly as 

 far as the Ist antenodal nervure and the cubital nervure in the forewing, 

 and over and beyond these two points in the hind. Arc usually between 

 the 1st and 2nd antenodal nervures or sometimes at the 2nd. 8th nervure 

 arising from the anal angle of the trigone in the hindwing ; 2 to 3 rows of 

 cells between ^ and ha. 



Membrane black. Stigma bright yellow (3 mm.). 



Genital organs of the male : lamina high, mchned about f50° to the body- 

 axis; basal segment furnished with a tuft of k>ng stiff bristles, end segment 

 moderately narrow, blunt and divided into two small Inbes by an incision 

 at its apex. TentaculfB of uniform height, inner segment foliate, outer 

 only a small, blunt prominence. Lobe moderately hij.'h and a little arched. 



Genital organs of the female : border of 8th abdominal segment moder- 

 ately large, foliateiy dilated, black. End of 8th ventral plate nearly 

 quadrilateral; its borders tumid. Vulvar scale not distinct ; 9th ventral 

 plate bluntly carinated. 



Hab. Khasia Hills, Kashmir, Kerseong and Thibet. 



17. Orthetrum trinacria, Kirby, Cat. ji. ?,7 (1890), 



MacLachlan, Ent. Month. Mag. (2) 8, p. 1.53 (1897). 



LibeUiila trinacria, Seiys. R°cne. Zool. (1841), p. 244. 



Lepthemis trinacria, Brauer, Zool. bot. Wien. 18, p. 72 (1868). 



Lihella trinacria, Selys. 



Lihf'llida clnthrata, Rambur. Neur. p. 48 (1842). 



Lihellula Bremti, Id. 



E.xpanse 65-71 mm. Length 47-52 mm. 



Head comparatively small ; eyes just touching ; a deep indigo blue in the 

 male; a pale opalnscent green in the female; much paler beneath ; occiput 

 large, black, with, in the female, a narrow, bisecting, median, yellow line; 

 occipital cavity yellow spotted with black, especially along the borders ; 

 vesicle conical, deeply notched, black, tipped with yellow in the female : 

 front highly glazed, translucent in the male with the sutures outlined in 

 yellow ; pale yellowish green in the female with the base narrowly black ; 

 epistome, labrum and labium translucent m the male ; pale opaque yellow 

 in the female. 



Prothorax : lobe high, tumid along its free border which is furnished 

 with a fringe of hairs, deeply notched. In the msde black, frosted with 

 white or blue, in the female black with the front and sides of the lobe 

 yeUow. 



Thorax robust, Male black, frosted with blue and usually with no 

 markings unless juvenile when a broad mid-dorsal and a simdar humeral 

 band may be seen showing through the frosting. Female pale yellowish 

 green, the sides more or less thickly frosted with blue or white. In some 

 specimens the sides and beneath are quite white. All biar black markings 

 more or less obscure as follows: — a broad mid-dorsal fascia, a narrow hume- 

 ral streak, incomplete above and below, laterally 3 oblique, narrow fascia? 

 which are not always present. The sutures usually outlined in black. 



Legs black in the male; yellow in the female, thefemorae being streaked 

 with black. The femorse bear a row of clo.-ply-set, small spines and a 

 very long stout spine at the extreme distal ends. 



