INDIAN DRAGONFLIES. 161 



occasionally a shade separated from it ; 10-12 antenodal nervures ; 

 hypertrigones entire ; trigone in forewing traversed, in the hind, 

 entire. 



Stigma small, narrow, bright yellowish brown, bordered heavily with 

 dark brown along the costal border, 2 5mm; costa and the second 

 aeries of the antenedal nervures and the cubital nervure, yellow. Mem- 

 brane white, grey at the free border ; bases of wings completely hyaline or 

 there may be in the females, rays in the inferior costal and cubital 

 spaces. 



Abdomen: very slightly dilated laterally at the base, moderately to 

 strongly dorso-ventrally. Narrow and tapering near the anal end. 

 Entirely frosted with bright blue but in juvenile males, with markings 

 showing through ; a narrow black, mid-dorsal line and dark, lateral 

 broader lines. 



Anal appendages black, frosted with blue. 



Genital organs of the male ; lamina broad, procumbent, inclined to 

 body-axis '6(f, rounded, at the apex, slightly notched, the surface covered 

 fairly densely with long line, grey hairs. Tentaculse small, nearly trian- 

 gular, laterally cupped. The internal tentacula with a somewhat blunt 

 hook, bent backwaids and outvards ; the external not noticeable, 

 apparent only as a broad, transverse swelling at the side. Lobe broadly 

 rounded. 



Female: markings as in the juvenile males but much better defined. 

 The narrow whitish green stripes on the sides are very conspicuous and 

 the brown fascie are well defined. 



The legs ochreous or paler yellow. 



Abdomen: very slightly dilated at the base, then cylindrical and more 

 robust than iu the male. Yellowish brown in colour; the mid-dorsal ridge 

 black with a tendency to beading; the borders especially of the hinder 

 segments broadly dark brown. This latter often not present in the basal 

 segments. 



Genital orgms of the female : border of Sth segment not dilated ; end of 

 eth ventral plate nearly straight, not tumid. 



This species which is the smallest of the genus, shows like many of the 

 others, great polychroism, although markedly onstant in its morphology 



Hab. Generally throughout Continental India ; Kashmir below 6,000'; 

 Ndgiris below the same altitude ; Ceylon and Burma. 



20. Orthetrum anceps, Kirby. 



Liheliula anceps, Schneider and Brauer. 

 LibcUa anceps, Schneider and Brauer. 

 Libellula rambiuii, Selys and l^rauer. 

 Orthetnim ranihurii^ Mac Lachlan. 

 Expanse o8 mm. Length 40 mm. 



Head ; eyes olivaceous brown above, paler beneath ; vesicle brown ; face 

 and labrum brownish or olivaceous. 



Prothorax : br:»vvn frosted with blue. 



Thorax : frosted completely with blue with some dark markings and 

 ii. yellowish brown tint showing through ; this more evident in juvenile 

 males. 



Abtlomen: frosted with blue. Much dilated dorso-ventrally but not at 

 all laterally, depressed and near the end, tapering gradually. 



Female similar but no blue frosting ; the sides of the thorax yellowish 

 brown with bhick rairkings. The abdomen yellowi-h brown, nearly cylin- 

 drical. Iu old speciuiaiia occasionally a little blue frosting. 



21 



