INDIAN BRAGONFLIES. 689 



Thorax dark metallic green marked with yellow as follows : — a short, ante- 

 humeral, cuneiform spot not extending upwards for half the height of the front 

 of thorax, 2 lateral bands, one under each wing, the first passing up between the 

 bases of the wings to traverse the tergum and connect up with its fellow from the 

 opposite side, the second on the metepimeron and bordered behind with black. 

 Beneath black, the middle of chest, longitudinally yellow. 



Wings slightly rounded, hyaline, reticulation black, shghtly tinted with saffron 

 at the extreme bases of hindwings, which are very broad ; stigma small, black 

 (2 mm.) ; in the forewing 11-13 antenodal nervures and 6-7 postnodals ; membrane 

 rather long, black. 



Abdomen cylindrical, a little tumid at the base, the borders of 7-9 a little 

 dilated, glossy black marked with yellow. 



A dorsal, yellow band on the 1st segment and the sides of 1 to 3, the apical 

 end of the 8th also yellow. 10th segment very short, flexed on the 9th so that the 

 articulation gapes widely above, pale brown in colour. On the dorsum of this 

 segment, is seen a pyramidal tubercle inclining towards the apical end of abdomen. 



Anal appendages black, as long as the 9th and 10th segments taken together, 

 the superior subcjdindrical, tapering and ending in a downward directed point 

 just before which is a robust, pointed sjiine ; inferior one-fourth longer than the 

 superior, with a blunt, straight point at the end and with a triangular spine at 

 about its middle. 



Legs slender, femora black, tibiae and tarsi pale yellow. 



female similar to the male but the wings are more tinted with saffron at the 

 base where they are broadly rounded. The small, " , "-like, antehumeral spots 

 are oblong, not cuneiform. The abdomen is more slender, a little compressed 

 laterally and not dilated at the end, black with a ^ngitudinal yellow band on 

 the dorsum of the 2nd segment, a basal annule and the dorsal carina, of the 3rd 

 yellow. 



Legs dark brown, the anterior pair of femora and the tibiag and tarsi yellow. 



Anal appendages short, separated by a rounded protuberance, coated with 

 yellow hairs. 



Hah. Khasia Hills, Assam. Type male collected by Mr. Atkinson. Closely 

 resembles the following species, yolanda, but the male has a spine on the superior 

 appendages and the inferior are longer and also furnished Avitli a submedian 

 spine, finally, the dorsal, pyramidal tubercle on the 10th abdominal segment is 

 directed towards the apical end of abdomen. 



The females of the two species are almost impossible to distinguish with 

 exactitude. 



12. Idionyx yolanda, Selys, Bull. Acad. Belg. (2), XXXI, 1871. 



Id. Ann. Mus. Genov., 1891. 

 Martin, loc. cit. 



Abd. : 6 31 mm., $ 27 mm. ; hindAving: o 30 mm., $ 29 mm. 



Male : head : labium and labrum citron yellow, the latter finally bordered 

 with black ; rest of face glossy black changing to dark metallic green on frons 

 and vesicle, except for a yellow mark on the centre of the rhinariirm. Back of 

 eyes glossy black ; eyes presumably some shade of green in the living state. 



Prothorax dark olivaceous. 



Thorax dark metallic green or blue, marked with bright yellow as follows :— 

 an isolated, antehumeral spot, shaped like a " , ", not extending upwards for half 

 the heicxht of the thorax, 2 lateral bands, one under each wing, the posterior of 

 which fs bordered below and behind with black. Black beneath, the centre of 

 chest longitudinally yellow. , , . j ... r. ^ ^, 



Wings slightly rounded, notched at the base, a little tinted with saffron at the 

 extreme base of the hindwings which are a little narrower than in optaUi, • 

 reticulation black; stigma small, black (2 mm); in the fore\ving, 13-14 antenodal 

 nervures and 5-6 postnodals ; membrane moderately large, black. 



