BORNEAN DRAGONFLIES. 67 



description of the anal appendages, in neither sex do these bear 

 any very marked resemblance to those of Metaphya. 



The genus Idionyx, hitherto unrecorded from Borneo, is 

 represented by a form of /. dohrni Kriiger, of Sumatra, Other 

 species in all probability await discovery. 



3. Idionyx dohbni Kriiger, subsp. borneensis nov. 



2 c? d. Matang, 1905-1907. 



Length of hind wing 27*5 mm. 



,, abdomen 25 „ 



,, anal appendages ... 3 „ 



Fore wing: antenodals 13, postnodals 6, supratriangulars 1, 

 cross-nerves in median space 1. 



Hind wing : antenodals 8, postnodals 9, one supratriangular 

 and two cross-nerves in basal space. 



Head : under lip brownish-yellow, upper lip yellow with black 

 margin thickest in the middle line, rest of the front of head 

 black with green and violet metallic shades. Occiput black. 



Prothorax black above, dark brownish yellow at the sides. 



Thorax metallic green above, with three yellow marks on 

 either side. The first is continued up from the coxse of the 

 second pair of legs, lying immediately in front of the humeral 

 suture, ending halfway up the suture. The second begins at 

 the coxae of the hindermost legs and runs up between the wings 

 as a narrow band The third is a rounded mark lying below the 

 base of the hinder wing. 



The abdomen is thin and cylindrical, slightly widened at 

 segments 7-9, almost entirely black ; the four anterior segments 

 of a shiny texture, the rest dull. Under surface of 2 and 3 yellow. 



Wings smoky, with faint yellow tinge at base ; membranule 

 small, grey. 



Legs : coxae and base of femurs of first two pairs yellow-brown. 

 Lower third of first pair of tibias, and nearly the whole of second 

 and third pairs, red-brown. The rest very dark brown or black. 



Anal appendages a little longer than the last two segments of 

 the abdomen. Upper pair black, lower appendage very dark 

 brown, black at the tip. Seen in profile the upper pair are 

 cylindrical, slightly bowed upwards at their middle, tapering very 

 gradually to the extremity, which ends in a downwardly directed 

 point. The lower appendage slightly overlaps them, and is curved 

 upwards towards its extremity, which carries a minute backwardly 

 directed point. 



Seen from above, the upper pair are thick for the first two-fifths 

 of their length, then rather thinner, approximated a little at 

 their middle, then diverging slightly, lastly turning inward again 

 towards their extremities, which have a rounded outline and 

 carry a fine tuft of hairs on their outer sides. 



The lower appendage for the first two-fifths of its length is 



