NEUEOPTEKA ODONATA OF CEYLON. 563 



the principal suture, narrow and interrupted in front and broader 

 behind ; abdomen very slender, black, yellowish beneath, in front, 

 and with a lateral yellowish line as far as the 6th segment ; 

 femora tawny, tibiae whitish, knees and tarsi blackish ; wings 

 hyaline, with blackish nervures ; pterostigma black, thick, cover- 

 ing a little more than one cell ; 16 postnodal nervures. 



Anal appendages black, pointed, as long as the 8th segment. 



Kottawa, April 24, 1892. 



Differs from D. tenax and allies by the two conspicuous 

 yellow spots on the vertex between the eyes. 



*t63. DlSPAEONEUEA SITA, Sp. n. 



Male (probably young). Head black above and behind, whitish 

 in front and behind; epistoma narrowly edged with black in 

 front, a narrow whitish stripe on the vertex, interrupted by a 

 black dot in the middle ; thorax bronzy black, with two whitish 

 dorsal lines and broader lateral stripes ; abdomen bronzy brown, 

 with a narrow whitish ring at the base of segments 2-5 ; seg- 

 ments 2 and 3 with a very narrow dorsal whitish line, and 2 with 

 a lateral yellowish line, angulated upwards towards the ex- 

 tremity, where it meets on the back ; the tips of segments 2-5 

 blackish ; 6 with the terminal third rufous ; 7-10 black ; anal 

 appendages short, whitish, the lower appendages longer than the 

 upper ; wings hyaline, with blackish nervures ; 12-14 postnodal 

 cross-nervures on fore wings ; pterostigma blackish, lozenge- 

 shaped, surrounded by a pale line ; upper sector of the triangle 

 on the fore wings extending one or two cells beyond the vein of 

 the nodus ; second sector of the triangle forming a very small 

 isolated cell, rising just before the basal postcostal nervure, 

 and only extending about one-third of the distance from this to 

 the next ; legs whitish, lined with black ; tarsi black. 



A more adult specimen is nearly black, with the stripe on the 

 vertex and the narrow dorsal lines on the thorax bluish, nearly 

 obsolete. 



Hot Wells, Trincomali, Oct. 23, 1890 ; Sept. 6 & 13, 1891. 



Probably allied to D. interrupta, De Selys, from Singapore. 



*t64. 0:ntchaegia ateoctana. 



Argia atrocyana, Selys, Bull. Acad. Belg. (2) xx. p. 416 (1865). 



Udagama, April 30, 1892. 



Previously recorded from Singapore and Java. 



