494 JOURNAL, BOMBAY NATURAL HIST. SOCLETY, Vol. XXV Jl. 



The abdomen differs widely in sliape, segments 2 and 3 are moderately dorso- 

 ventrally dilated, segment 4 viewed from above is very broad, in profile moder- 

 ately depressed. 



The colour is the same as seen in acigastra. 



Anal appendages are nearly as long as the combined length of segments 9 and 

 10, narrow as seen from above, slightly divergent at the base, the ends acumi- 

 nate, in profile they are curved in a blunt convexity at about their distal third. 

 There is a single small spine before tliis convexity. Inferior appendages are not 

 quite as long as the superior. 



Genitalia : 2nd segment very similar to acigastra but the hamules are fissured 

 for rather more than their distal half and the outer border is filled with a bright 

 yellow membrane, the lobe is depressed and narrow. 



Hab. — Lower Burma. 



Genus — Bkachythemis. 



80. Brachythemis gestroi, Selys. 



Two females taken at Gauhati, Assam, by Mr. T. Bainbrigge Fletcher, April 

 1920. 



Abdomen 24 mm. Hindwng 31 mm. Expanse 64 mm. 



Head : eyes broadly contiguous : vesicle large, rounded : occiput small: 

 suture broad and deep and separating two rounded, finely pitted, horse-shoe 

 shaped areas on the front. 



Eyes olivaceous and yellow at the sides and below, a reddish brown cap above : 

 vesicle reddish with a metalhc lustre : occiput reddish brown, the area behind 

 bright yellow : upper part of frons metalhc blue : labium, labrum and face 

 yellowish with a reddish flush above. 



Prothorax with a moderately sized posterior lobe, rather smaller than that 

 of Sympetrum, bilobed, but slightly notched. Fringed with a ruff of longish 

 hairs. Ochreous. Thorax bulky, dark olivaceous or brownish yellow with a 

 greenish tinge. Legs blacldsh brown, the femora ochreous at the base and 

 this turning to brown distally. Hind femora with a row of 7 spines, the distal 

 ones (4) very large, the proximal ones small. 



Abdomen tapering from the base to the apex, triquetral, especially in the 

 distal segments. A transverse ridge on the 2nd and 3rd segments, poorly marked 

 ones on the 4th and 5th. Anal appendages robust, conical. 



Fig. 70. Wings of Brachgdiplax gestroi. 



Abdomen a golden yellow in colour, the transverse ridges, intersegmental 

 sutures and lateral borders finely mapped out in black. An obscure, diffuse, 

 black, subdorsal fascia which runs from the 4th segment, gradually broadening 

 until it covers most of the 8th and all the 9th and 10th segments. 



