arT. 21. DRAGONFLIES OF BURMA AND LOWER SIAM—LAIDLAW. 25 
Tibet is a mistake, de Selys in several cases referred material from 
the Kast Himalayas to Tibet where Assam would have been correct. 
Moreover I doubt if the race nigripes can be regarded as valid. 
Martin gives as one of the points separating it from the typical 
khasiaca that the wings of nigripes are without a tinge of saffron at 
the base; whilst his colored figure of nigripes shows the saffron tinge 
very distinctly. I have been able to compare two males, one in 
excellent condition from Kobo in the north of Assam, the other much 
faded from the Mangaldai district also in Assam. The former cer- 
tainly comes from a district which Selys referred to as Tibet. It is 
however a brightly colored insect, not at all like Martin’s figure 
which is copied from a very discolored example. 
In the Kobo specimen the lower lip is dull yellow, the upper lip 
front of the head, and eyes, olive-green. There is a well-developed 
T-shaped mark, the vertical part being very broad. 
The thorax is of a bright olive-green, the mid-dorsal carina, the 
humeral sutures, and a line in the position of the first lateral suture 
sharply defined with black. ‘The inter-alar space has bright blue 
markings. ‘The femora are dark brown, their anterior surfaces al- 
most black. The tibiae and tarsal joints are brown. The abdomen 
is black, the base of the first segment dark brown. The second seg- 
ment has a large anterior and posterior blue spot on either side, the 
auricle is blue, its margin finely outlined with black. The mid-dorsal 
longitudinal line of the segment is blue, and on either side of this 
there is a median linear blue mark and a posterior blue spot, in 
addition to the lateral blue markings. The third segment has a basal 
lateral blue mark. Otherwise the abdomen is wholly black save that 
the sixth segment has a small pair of transverse linear marks before 
its middle, and that the apex of each segment ventrally is brown. 
The anal appendages are exactly as figured by Martin; black in color, 
the lower appendage about two-thirds the length of the upper pair. 
The base of the wings are just perceptibly tinged with saffron for a 
length of about 2 mm. 
The hinderwing of this specimen is 43 mm. long and 12 mm. in 
breadth. The abdomen (somewhat flexed) is about 47 mm. in length 
and the upper anal appendages 6 mm. 
The Mangaldai specimen which is much faded resembles closely in 
coloring Martin’s figure. 
I think we may conclude that the race nigripes is founded on a 
specimen in which the coloring is badly retained, and that the race 
is in all probability not valid. 
GYNACANTHA FURCATA Rambur. 
The next species furcata was founded on a female specimen which 
was without a T-shaped mark on the frons. Ris has expressed the 
