24. PROCEEDINGS OF THE NATIONAL MUSEUM. Vor. 62. 
GYNACANTHA JAPONICA Bartenef. 
The most northerly ranging species of this genus, japonica, is 
apparently closely allied to the two preceding species and has been 
distinguished from hyalina only since 1909.1 The anal appendages 
of the male are about 6.5 mm. long; narrow with parallel sides, with 
very blunt apices. and with a distinct internal subdorsal projection. 
The lower appendage is about one-fourth the length of the upper 
pair. 
In size japonica stands very near hyalina, the male having the 
hinder wing 42 mm. long and the abdomen 45 mm. The same 
measurements in the female are 47 mm. and 50 mm., respectively. 
GYNACANTHA SALTATRIX Martin. 
The small species saltatriz, of which I have seen a single male 
from the Mangaldai district of Assam is related to the group subin- 
terrupta, hyalina, japonica by the shape of the anal appendages of 
the male, by the possession of a well marked T-shaped mark on the 
frons and by the degree of inflation of the base of the abdomen and 
size of the auricles. The type specimen from Tonkin has the hinder 
wing 35 mm. in length and the abdomen 42 mm. The example 
seen by me has the following measurements, hinder wing 36.5 mm., 
abdomen 42 mm. Upper anal appendages 5 mm., pterostigma 3.5 
mm., breadth of hinder wing at nodus 11 mm. The lower anal 
appendage is nearly one-half the length of the upper pair. The 
Wings are without basal markings, whilst in the other members of 
the group the subcostal and cubital spaces have a brown tinge barely 
reaching the level of the first antenodal nerve. In my specimen the 
color is much faded; the thorax appears to beof an almost uniform 
dull green-brown; the legs are uniformly brown. ‘The dorsal surface 
of the abdomen is black, with a slightly metallic luster, the first seg- 
ment and the basal half of the second are blue laterally, the auricles 
are blue edged with black. Segments 2-10 have each a pair of 
apical lateral yellow spots, very minute from 2-5, increasing there- 
from to 9, on which segment they extend for its whole length, 
widening distally. The sides of the distal half of the second segment, 
and the ventral surface of the whole abdomen is yellow. The upper 
anal appendages are brownish black; the lower appendage is pale 
yellow, its apex tipped with black. 
GYNACANTHA KHASIACA MacLachlan. 
The other northern species khasiaca from Assam is a larger and 
more robust insect. Martin figures a race nigripes (de Selys MS) 
to which race Kruger also refers. The locality given for this race 
11 Bartenef, Samml. Zool. Mus. Univ. Tomsk. 11-12, p. 7 (Russian), p. 14 (English), 1909 pl. 2, figs. 7 
9, 10 
