PitieoewOrwsE o- ON VOR TH NEAL DR AGONELIES 
DNS PEE UND a ACNe DEUS Bee: 
No. 4.—THE GENUS PSEUDAGRION. 
By F. F. LAmDLaw. 
Genus Pseudagrion, de Selys. 
A genus showing the essential features of the dominant section 
of the Agrioninae both as regards venation and in other respects. 
It ranges from S. Africa through the tropical regions of the old 
world to Australia (I can find no record for Ceylon). It is charac- 
terized especially by the following characters :— 
(i) Extent of petiolation of the wing This ceases at the 
level of the basal post-costal nerve; this latter lies at a 
level between the first and second antenodal nerves. 
(ii) Presence of post-ocular spots, and by certain sexual char- 
acters -— 
(a) Pterostigmata of all four wings of males alike. 
(b) Shape of superior anal appendages of males. 
(c) Structure of hind margin of prothorax of female. 
(d) Absence of a spine on the ventral surface of the eight 
abdominal segment of the female. 
Morton has published admirable figures of the anal append- 
ages of three species, viz. P. decorum (Ramb.), P. hypermelas, Selys, 
and of P. bidentatum, Morton (Trans. Fnt. Soc. London, 1907, pl. 
xxiv). ‘Tillyard has figured the anal appendages of a male P. 
australasiae, Selys, from Queensland, the base of the wing of the 
same species, and the prothorax of the female of an allied form P. 
aureofrons, Tillyard, the latter exhibiting the characteristic generic 
features (Proc. Linn. Soc. N.S. Wales, XX XVII, 3, pls. xlviil, xlix). 
The anal appendages of P. microcephalum (Ramb.) have been 
figured by myself in a recent paper (Mem. Ind. Mus., V, p. 179). 
In the Museum collection examples of four Indian species are pre- 
served. 
I give below a table which will, I hope, be of service in facili- 
tating the recognition of the Indian species. 
CHARACTERS OF MALES. 
A, Abdominal segments 1-7 with black or bronze black markings, 
i. Segments 8, g, 10 black. 
a. Thorax black with olive-coloured ante- 
humeral band, superior anal appendage 
bifurcate in profile, with a single large 
internal tooth .., e. ... P. hypermelas, Selys. 
