236 THE ENTOMOLOGIST. 



band of black, tibiae with a similar but narrower band extending 

 along the proximal two-thirds. Spines and tarsal articulations black. 

 Anal appendages. Upper part black, with a square yellowish- 

 white patch on each of their opposed surface. Lower pair yellowish- 

 white, the apex black. Seen in profile the upper pair are stout, 

 slightly bowed downwards, truncate, with their posterior margin 

 concave, the upper end of this margin a little hooked ; the lower 

 pair appear conical, tapering to an incurved apex. 



When looked at from behind the upper pair are divaricated, the 

 white mark on each is conspicuous, while each has a very strong 

 downwardly dii'ected spur near its base on its inner side ; round 

 this spur, which is not seen in profile, the apex of the lower 

 appendage is hooked from without inwards on either side. The 

 tubercles at the apex of segment ten are perfectly white, very 

 small but, on account of their colour, rather striking in appearance. 



The colouring is described from the least mature of the males, 

 which is much more vividly marked than are the older specimens. 

 These differ chiefly in having the green of the head, thorax, and 

 prothorax less brilliant, and in having lost the white colour of 

 the small apical tubercles of segment ten. On the other hand, the 

 whitish patch on the upper anal appendages retain distinctness. 



The species may be defined shortly as an Ischnura with segments 

 eight and nine wholly blue, and ten blue with black dorsum. 

 Tubercles on ten very small. Colour green for the most part, 

 with black markings. Pterostigmata of fore wings of male con- 

 siderably larger than those of hind wings, their colouring black, 

 with upper part white, not covering an entire cell ; pterostigmata, 

 of hind wings grey. Posterior margin of prothorax not forming 

 definite lobes. Anal appendages with conspicuous white patch on 

 opposed surfaces of upper pair ; these have also a large downwardly 

 directed spur. 



Ischnura immsi, sp. nov. 

 One male Sender Bhandara, Central Provinces 8 . 12 : 1912. 

 Length of abdomen 17 mm. ; of bind wing 11 mm. 

 Build of an Acjriocnemis. 



Venation. Postnodals on fore wing seven. Arculus at level of 

 second antenodal ; anal vein separating from the hind 

 margin a considerable distance before the level of the 

 cubito-anal cross vein, and at the level of the first ante- 

 nodal. Upper side of quadrangle of fore wing quarter 

 the length of its lower border, in hind wing about half. 

 Pterostigmata of all wings grey, about equal in size, the 



. outer border very oblique ; covering two-thirds of the 

 Ischnura immsi, ^^\^-^^^. n 



sp. nov. subjacent cell. 



Colouring blue with black marking. 



Head. Under surface white. Anterior surface blue, including 

 first and second joints of the antennre, but the nasus black ; upper 

 surface velvety black, a linear postocular mark on either side, blue, 

 meeting its fellow in the middle line. 



Prothorax black, fore margin blue, blue marks on each lateral 

 border, hind margin not lobed, with a fine blue edge. 



