INDIAN DRAGON FLIES. 495 



hindwing broad, no definite arrangement of cells in rows between the base and 

 loop; loop well developed its outer angle obtuse, split cells at the outer angle 

 and at the anal angle of the trigone ; membrane of medium size ; stigma small. 



Genital organs of the male ; lamina usually procumbent; tentaculate strongly 

 differentiated, the segments well divided ; the lobe comparatively small. 



Genital organs of the female ; the border of the 8th abdominal segment curl- 

 ing outwards, not dilated ; end of the 8th ventral plate variable, small or very 

 large, entire or notched, projecting or procumbent; 9th ventral plate occasion- 

 ally with 2 booklets near the middle, the border rather flatly rounded. 



Key to Species. 



A. Comparatively small species. 



Antenodal nervures numbering 6J to 7|. 



a. Thorax duU red in front and above, 

 bright lemon yellow at the sides. 

 Basal line to forehead interrupted 

 outwardly. Legs black, striped with 

 yellow Stricilatum. 



h. Thorax sandy yellow. 



Basal line to forehead almost obsolete. 



Legs a sandy yellow Decoloralum. 



c. Thorax reddish yellow above and in 



front, greenish yellow laterally. 

 Basal line to forehead broad and 



sharply defined Fonscolombei . 



d. Thorax black, marked with bright 



yellow stripes laterally. 

 Basal line to forehead black and 



diffuse. Legs black Commixtum. 



B, Larger species with comparatively small head. 



Antenodal nervures numbering 8| to 9J. 



a. Thorax dull reddish yellow, with a 



narrow, black, humeral line. 

 Antenodal nervures 8J. 

 Wings hyaline, with a well-marked, 



basal, yeUow spot Orientale. 



b. Thorax black, with 2 yellow stripes 



laterally. 

 Antenodal nervures 9i. (Nervurs black). 

 Whole of wing somewhat smoky, 



with a diffuse yellow spot at base Hypomdas. 



31 . Sympetrum striolatum, Meyer-Dur. 

 Libellula vulgata, Vander Linden. 

 Libellula striolata, Charpentier. 

 Sympetrum vulgatum, Linne. 

 Diplax striolata, Brauer. 

 Diplax vulgata race striolata, Schoch. 

 Libellula ruficollis, Charpentier. 

 Libellula secula, Hagen. 

 Libellula tnacrocephala, Selys, 



