4kT. 21. DRAGONFLIES OF BURMA AND LOWER SIAM—LAIDLAW. 11 
the Balkan Peninsula to Persia on the one hand, and the damp 
densely forested countries to the north and east of the Bay of Bengal 
on the other. 
It is to be hoped that sooner or later an ample supply of material 
will enable some one to unravel the tangle in which these very inter- 
esting insects lie. For the present I refer to Cephalaeschna but only 
provisionally the following species: acutifrons Martin, masoni Martin, 
stkkima Karsch,‘ lugubris Martin, and of course without condition 
orbifrons de Selys, all from the northeast Himalayas. C. acutifrons 
occurs also in Kwan-Tung. 
LIST OF ORIENTAL SPECIES OF THE GENUS CEPHALAESCHNA. 
. C. orbifrons de Selys: Northeast Himalayas. 
. C. sikkima Karsch:* Northeast Himalayas. 
. C. acutifrons Martin: Northeast Himalayas, Kwan-Tung. 
. C. masoni Martin: Northeast Himalayas. 
. C. lugubris Martin: Northeast Himalayas. 
Genus PERIAESCHNA Martin. 
Plate 1; fig:)2. 
ok ON 
The single described species of the genus Periaeschna magdalena 
Martin is from Tonkin. The Indian Museum collection includes a 
pair apparently of the same species from the Garo Hills in Assam; 
and Ris tells me in a letter that he has a species of the genus, not 
necessarily conspecific, from Yunnan. For reasons given above I 
think that Caliaeschna laidlawi will probably be found also to belong 
to this genus. 
In addition to the specialization of the dentigerous plate, Peri- 
aeschna magdalena has densely veined wings, and a small pterostigma 
with well developed brace. The male has the second abdominal seg- 
ment rather inflated and the base of the third much narrowed. Its 
anal appendages are much like those of Aeschna mizta Latreille. 
Genus ANAX Leach. 
The Palaearctic species Anax parthenope de Selys has established 
itself in India as far south as Mysore in the peninsula. Several other 
species are found within the limits of the region. All of them fre- 
quent open sunny country and it is noteworthy that ephippiger Bur- 
meister does not appear to have been recorded for any of the more 
densely forested areas, or equatorial territory, whilst it is exceedingly 
abundant in most parts of India, one observer saying that he has 
never seen such numbers of any other dragon fly in flight. This 
species, interesting as being partly migratory in its habits has also 
4 Since these notes were sent to press the genus Gynacanthaeschna has been erected for this species by 
Fraser (Journ. Bombay Nat. Hist. Soc., vol. 28, June 1922, p. 618). The other species in my list are 
retained in Cephalaeschna. 
