4rT. 21. DRAGONFLIES OF BURMA AND LOWER SIAM—LAIDLAW. 21 
certain South American species (e. g., nervosa Rambur) in having 
the abdomen almost cylindrical throughout. The nerves of the 
wings are of a medium brown color, the pterostigna is of a creamy 
yellow, and there is no definite T-mark on the frons. The thorax is 
uniformly grass green with a beautiful enamel-like surface; the legs 
are brownish-yellow throughout, with dark brown spines. The length 
of the abdomen is 42 mm. with an additional 5 mm. for the anal 
appendages. The hinder wing is also 42 mm. long. 
I have a pair from Poona given me by Major Fraser, and I have 
also seen an immature male from Chota Nagpur, in the collection of 
the Indian Museum. So that the recorded range of the species is in 
northern Peninsular India. 
GYNACANTHA BASIGUTTATA de Selys. 
G. basiguttata is a large species, the abdomen and hinder wing of 
the male having a length of about 50 mm. each, whilst the anal 
appendages of the same sex are 6.5 mm. long. The abdomen is 
strongly compressed at the middle of the third abdominal segment 
and the auricles are large. A T-shaped mark is present on the frons. 
Both fore and hinder wings sre tinged with deep brown in the costal 
and subcostal spaces, from the wing base to the level of the first 
antenodal nerve; the legs are black. The readiest guide to the 
determination of the species is found in the shape of the anal ap- 
pendages of the male. ‘These are markedly spatulate, the apical 
third being flattened and dilated so that each is shaped not unlike 
the business end of a wooden golf club, save that the ‘“‘head”’ is not 
inclined to the ‘‘shaft”’ at so great an angle as in the case in the club. 
This species has a wide range, from Burma and the Indo-Chinese 
Peninsula, through the Malay Peninsula and islands, to the Philip- 
pines and Celebes reaching apparently the Loo-Choo Islands to the 
north. Ris had pointed out (1911) that Martin’s Figure 197 on 
page 193 in his Monograph is not a figure of the anal appendages of 
the male of this species, but more probably of those of dohrna. 
Another species with spatulate anal appendages in the male is musa. 
In this case the apices of the appendages are obliquely truncate, and 
the lower appendage is more than one-half as long as the upper pair, 
whilst in basiguttata the lower is only one-third as long. The legs 
are brown. The wings are without basal coloring; in size the species 
is about equal to basiguttata. 
G. musa is restricted apparently to Java; reported doubtfully 
from New Guinea. 
Three males, one from Khow Sai Dow Mountain about 305 meters, 
(1,000 feet), Trong, lower Siam, the two other specimens from 
Trong, lower Siam; collector Dr. W. L. Abbott, collection U.S. N.M. 
This species is readily distinguished, so far as the male is concerned, 
from its eastern congeners by the shape of the anal appendages. 
