BORXEAN DRAGONFLIES. 77 



No trace of lower sector of quadrilateral. Upper sector of 

 quadrilateral of fore Aving extending to the first cross-nerve after 

 the quadrilateral in all the specimens. In the hind wing variable, 

 ranging from the nodal cross-vein to that immediately beyond it. 



Postnodals of fore wing 14-15. 



c? . Head entirely black, including the lower surface. 



Prothorax : above of a rich carmine, anterior and posterior 

 lobes delimited by a fine transverse black line. Sides and under 

 surface black. 



Thorax black ; in front a pair of carmine bands, slightly cres- 

 centic, extending for about two-thirds of its length from its 

 anterior margin, succeeded at the top of the thorax by a minute 

 carmine spot. Antealar sinuses of the same colour. Anterior 

 lateral thoracic band of a brick-red colour, the posterior, on the 

 metepimeron, yellow. 



Legs black, coxse and a ring round the base of the femora brown. 



Abdomen black, segments 1 and 2 carmine above ; 3 has at its 

 base above a very long narrow carmine triangle with its apex 

 directed backwards, extending for about one-fourth the length of 

 the segment. 



Anal appendages black, dai-k brown at their bases. 



The upper pair seen from the side have their posterior margin 

 rather crescentic, with an inwardly directed spur on the loM'er 

 side. Lower pair with the posterior margin g -shaped, the 

 terminal hook rather more slender than in most species of the 

 genus. 



5 . Head black, upper lip yellow ; a very fine yellow mark runs 

 inward from each eye to the ocelli, but does not form a complete 

 band. 



Prothorax black ; median lobe with a pair of round lateral 

 yellow spots, anterior lobe with a very small lateral yellow mark. 

 The median lobe is almost hemispherical. The posterior margin 

 is produced on either side so as to form a curious horn-like 

 projection directed upw-ards and then forwards. 



The thorax is black. There is a fine yellow antehumeral stripe 

 incomplete above, extending about one-third the length of the 

 upper surface. There is a well-marked yellow lateral band, and 

 behind this the yellowish grey of the under surface shows at the 

 side of the metepimeron. 



Legs brownish black, the anterior surfaces of the femora and 

 tibias yellow. 



Abdomen dull brown, paler beneath, with a small subterminal 

 pale ring on segments 3-6 ; the last three segments almost 

 entirely black. 



The male is characterised especially by the colour of the head 

 and prothoi'ax ; the female appears to approach that of D. verticalis, 

 but differs in details of coloration. I believe I have correctly 

 referred the females described above to this species, but as was 

 the case with that described by de F^elys for J), verticalis, the 

 evidence is not conclusive. 



