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



Wings hyaline with dark brown tips, this colour extending inwards as far as 

 the inner end of the stigma and with the inner margin extending back almost 

 straight to the termen. The apical marking differs according to the age of the 

 specimens and in some very juvenile specimens sent to me by ]VIr. Bainbrigge 

 Fletcher from Pusa, it is entirely absent or if present is a mere shadow. Stigma 

 dark brown, 2 mm. A small tinge of brown at the base of the hindwing extend- 

 ing out as far as the cubital nervure. 



Abdomen black marked with pale yellow ; segments 2 and 3 with broad 

 yellow spots on the sides which often almost entirely obscure the ground colour- 

 ing. Subdorsal spots on the 4th to 7th segments which gradually decrease in 

 size as traced distally. Last .3 segments entirely black. 



Anal appendages pale yellow or ashy. 



Female very similar to juvenile males but brighter coloured. The black 

 markings of the thorax obscure, the yellow markings of the abdomen prepond- 

 erating over the black which is present only as fine annules at the intersegmental 

 joints and a narrow black line along the mid-dorsal carina. A fine black line 

 along the ventro-lateral ridge. The 9th and 10th segments black or small, 

 yellow, subdorsal spots on the 9th. Anal appendages bright yellow. 



Wings hyaline, the basal spot bright saffron, the stigma pale brown. Th(^ 

 apical brown markings seen in the male, quite absent in the female. 



Hab. Eastern and Central India, Ceylon, Bengal, Madras and Burma extend- 

 ing thence to the Straits, Malacca, Singapore, Java. 



This species is found only in marshy areas, being rarely if ever seen away 

 from the neighbourhood of water. 



A well marked variety is foimd in Mesopotamia and INIr. Rishworth has sent 

 me similar specimens from Karachi. In these the apical marking is usually 

 obsolete and if present is a mere shadow. There is also a well-marked blackish 

 brown basal spot reaching more than half way to the first antenodal, beyond 

 the cubital nervure and thence obliquely to nearly as far as tomus. ■' This 

 variety may be the D. parvula of Rambur but as I have seen no specimens 

 of the latter, I cannot say for certain. " 



Fig. 36.— Male sexual organs of D. trivialis, ( x 18). 

 1. In profile. 2. From the front. 



