T9I9-] 



F. F. Laidlaw : Indian Dragon/lies. 



^11 



Rhodischnura differs strikingly in appearance from the true 

 Ischnwas and the male of the single known species has no post- 

 ocular spots ; but in other respects it is closely allied to Ischnura 

 and probably directly derived from that genus. 



TABI.E OF SPECIES OF ISCHNURA AND RHODISCHNURA 

 (males ONIvY), 



1. Post-ocular spots present. Well-marked bifid dorsal 

 tubercle at apex of last abdominal segment. 



A. Abdomen entirely black and blue (or black and 

 green). 



I. Segments S-io dark-blue above, lo 

 with black, subquadrate, dorsal 

 patch. Pterostigma of fore-wing 

 with costal margin shorter than anal, 

 and inner margin more oblique than 

 the outer 



2. 



Segments 8-io blue, 9-10 marked with 

 black dorsally. Pterostigma of fore- 

 wing with inner and outer margins 

 parallel, costal snd anal margins sub- 

 equal. 

 a. Segment 2 of abdomen steely 

 metallic black 



b. Segment 2 of abdomen black 

 not metallic 



Segments 



B. Abdomen with orange colouring. 

 8-9 blue, 10 black above. 



1. Dorsum of segment 2 black. Larger 



species (abd.crt. 23 mm.). Costal and 

 anal margins of pterostigma of fore- 

 wing sub-equal 



2. Dorsum of segment 2 largely orange. 



Smaller species (abd. ca. 16-20 mm.}. 

 Costal margin of pterostigma of fore- 

 wing distinctly longer than anal mar- 

 gin. Thorax with a pair of minute 

 cylindrical horns anteriorly 



C. Abdomen orange-red and black only. 

 I. Segments 7-10 black 



/. forcipata, Mor- 

 ton. (N. W. 

 India). 



/. seiiegalensis 

 (Ramb.). (Tropi- 

 cal old-world, ex- 

 cept Australia). 



/. elegans (Van der 

 L.I. (Palaearctic). 



/. inarniata, Cal- 

 \-ert. (Kashmir). 



2. Segments g-io and distal half of 

 black 



8 



IL No post-ocular spots. Apex of last abdominal seg- 

 ment widely excavated. 



D. Abdominal segments 1-4 red, 5-6 lemon yel- 

 low, 7-10 metallic black 



J. aurora, Brauer. 

 (Lidia to Aus- 

 tralia). 



/. niina)idalei, sp. n. 

 (S. Shan States). 



I. ritfostigiua, Selys. 

 (Bengal, Assam). 



Rhoihschmira iitir- 

 sei (Morton). (N. 

 Central India). 



The females of any one species of Ischnura fall into one 

 or more of three categories. In the first place all the species 



