14 PROCEEDINGS OF THE NATIONAL MUSEUM. von. 62. 
species, perhaps only a geographical race Anaciaeschna megalopis 
Martin, is from New Guinea, whilst the third species Anaciaeschna 
triangulifera MacLachlan, inhabits Madagascar and Kast Africa. 
As its name implies the genus seems to link to Anaz with Aeschna. 
Its species have traces of accessory lateral carinae on the abdominal 
segments 4 -7, and the marked anterior curving of M, immediately 
below the pterostigma otherwise characteristic of Anaz, whilst the 
male has the anal area of the hinder wing excavated, and the radial 
sector is forked. 
Genus AMPHIAESCHNA de Selys. 
A genus containing two species confined to the more equatorial 
parts of the oriental region; apparently allied to Aeschna though 
somewhat primitive. As regards venation the arculus is remarkable. 
The lower limb of this structure is not in line with the upper limb, 
and shows more clearly than it does in most Aeschnines, its origin as 
a reinforced cross nerve. A similar condition obtains in Coryphaeschna, 
and I was at one time inclined to suspect a possible relationship be- 
tween that genus and Amphiaeschna. However, after studying a pair 
of Coryphaeschna ingens kindly loaned to me by Mr. Williamson, I 
have come to the conclusion that there is no close kinship between 
the two genera. Amphiaeschna resembles Heliaeschna fairly closely 
in venation, excepting as regards the arculus,’ which in the latter 
genus is almost in a straight line. The dentigerous plates of the two 
genera are widely different, that of Amphiaeschna being rather retrouse 
armed with very small irregularly arranged spines. The species of 
Amphiaeschna are large handsomely colored insects; they inhabit 
thickly forested country, and probably breed in the small muddy 
pools that depend for their existence on a copious rainfall. I took 
two males of grubauert in Perak about 305 meters (1,000 feet) above 
sea level flying about a forest pool of this kind, and with them a single 
male specimen of Gomphidia perakensis Laidlaw. 
AMPHIAESCHNA GRUBAUERI Foster. 
Represented in the collection before me by a single male, taken at 
Trang, lower Siam. 
Of this species I have also seen two males from Perak caught by 
myself, now in the University Museum at Cambridge (England), and 
a single female from Mount Batu Lawi in Sarawak, Borneo. 
I can find no specific differences between this species and peramplo, 
of Martin, which in my opinion must be regarded as a synonym of 
grubauert. 
7Since this was written I have received a female of an undetermined species of Heliaeschna from the 
Malay Peninsula in which the arculus of the forewing resembles closely that of Amphiaeschna. 
