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TWO NEW SPECIES OF THE GENUS ISCHNUBA 

 (ODONATA) FEOM NORTH INDIA. 



By F. F. Laidlaw, M.A. 



The specimens described below were sent to me for examination 

 amongst a small collection of- dragontlies from the N.W. and Central 

 Provinces of India by Dr. A. D. Imms, of the Indian Forest Research 

 Institute at Dehra Dun. 



They present several features of interest, and belong to two 

 species which do not appear to have been described previously. 



Ischnura gangetica, sp. nov. 



Two males Sat Tal Kumaon 12 . 5 : 12 (fully mature). 



Three males Shamket Kumaon 16. 12 : 12 (two males im- 

 perfect, fully mature ; one male not quite mature). 



Length of abdomen, male 24 mm., of hind wing 15 mm. 



Build of I. senegalensis, but a trifle more robust. 



Venation. Postnodals on fore wing eight, exceptionally seven 

 or nine. Arculus on fore wing placed well beyond the level of the 

 second antenodal (but in one instance, on the 

 left side, it lies before the level of this nerve). 

 Pterostigma of fore wing black with milky 

 white front border, its fore margin shorter 

 than the hinder ; its antero-posterior diameter 

 greater than its length from within outwards. 

 Its hinder margin is strongly convex, and 

 covers about three-quarters of the subjacent 

 cell. Pterostigma of hind wing pale grey in 

 colour, much smaller, oblique, its inner and Ischnura (jangctka, 

 outer margins nearly parallel, covering barely ^P- "^v. 



half of the subjacent cell. 



Head. Under surfaces yellowish-white, anterior surface green, 

 including the first joint of the antennae ; there is a fine black line 

 at the base of the upper lip, and the nasus is black. The upper 

 surface and distal joints of the antennae are black, with a round 

 green (or blue?) postocular spot. 



Prothorax. This is black above, with a green margin in front, and 

 pear-shaped lateral green mark on either side, and a very fine, green 

 edge to the posterior margin. When looked at from above, this 

 margin is seen to have a small, medium, angular projection, but 

 there is no marked prominence. 



Thorax black dorsally, green at the sides, yellowish- white below ; 

 with a fine, complete, green antehumeral band on either side. 



Abdomen black above, the anterior segments blue-green at the 

 sides and below ; in the hinder segments the ventral colour develops 

 an orange tone. Segments eight and nine entirely blue ; ten black 

 above, blue ventrally. The articular rings are black, and the black 

 dorsal band on each segment, after the first and second, is contracted 

 at the very beginning of each segment, dilates, and then contracts 

 again abruptly at its extreme hind end. 



Legs yellowish-green ; femora with a broad, longitudinal, dorsal 



