8 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 62. 
These observations explain the presence of an oblique vein near the 
commencement of the radial supplement in Aeschna (and presumably 
in Gynacantha and in other genera), this oblique vein following the 
lower branch of the fork of tracheal Rs. And similarly in the case 
of the median supplement. 
They also explain why it is that in Anaz there are several oblique 
veins in the area between Rs and Rspl, these veins representing the 
several regularly arranged branches of tracheal Rs (or again of M,). 
But whether Aeschna or Anax shows the more primitive arrange- 
ment of the tracheae I can not determine. In this connection Need- 
ham’s remarks in his Genealogic Study deserve careful consideration. 
Genus JAGORIA Karsch. 
Up to the present unrecorded from Burma or Siam. Species are 
known from Sumatra, Borneo, the Malay Peninsula, the Philippine 
Islands, the Celebes, and from Japan; whilst an unpublished form 
occurs also near Darjiling, represented in the collection of the Indian 
Museum by a female specimen taken at an altitude of 2,140 meters 
(7,000 feet). 
Jagoria seems to have as its nearest ally the American Gomph- 
aeschna. Linaeschna from Borneo, with these two genera forms a small 
group of forms of a primitive appearance, which stand rather far 
apart from other genera of the Brachytron series. 
The genus is remarkable for the strongly bifid interior anal append- 
age of the male, a feature shared by Gomphaeschna and Linaeschna 
and otherwise found amongst Aeschninae only in the primitive Petalia 
alliance. Another interesting character is that afforded by the lateral 
dilatation of the abdomen of the female, which, beginning at the dis- 
tal end of the third segment, reaches its maximum at the fifth and 
disappears at the apex of the sixth segment, giving the abdomen a 
curious quasi-archaic appearance. 
JAGORIA POECILOPTERA Karsch. 
The type of the genus is Jagoria poeciloptera Karsch, from Luzon. 
(The male recorded under this name by Karsch from Singapore is 
probably rather an example of the next species Jagoria modighant.) 
This is a species of small size; Martin notes the length of the hinder 
wing as being 45-37 mm. The pterostigma is said by the same 
writer to be short and narrow, and the wings of the female are marked 
with bright saffron color at their bases. 
JAGONIA MODIGLIANI de Selys. 
Jagonia modigliani de Selys, the best known species occurs in the 
Malay Peninsula, Borneo, and Sumatra. It is larger than the pre- 
ceding; a female before me has the hinder wings 43 mm. in length, 
the pterostigma is 3.75 mm. and of a reddish-brown color. The whole 
