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MUSEUM, No. 2. ° 
By F. F. LAIDiaw. 
LIBELLULINAE. 
Genus Amphithemis, 
See Ris, Monogr. Libell., pp. 88-91 in Coll. Zoolog. Selys, Fasc. IX, 
1goQg. 
Anal loop feebly developed, containing few cells. Arculus 
lying between the second and third antenodal nerve. Costal side 
of discoidal triangle of fore-wing relatively long, broken. Radial 
supplementary sector moderately developed, median supplement 
not at all. Proximal side of discoidal triangle of hind-wing a little 
distal to the arculus. Three or four median nerves on the hindwing. 
Discoidal triangle followed by one or two rows of cells, increasing. 
Colouration black with yellow or brick-red markings; (adult 
male of A. vacillans, Selys, with pruinescence on basal segments of 
abdomen). Abdomen rather long, slender and cylindrical; seg- 
ment 8 of female without dilatation. Legs long, the hairs on 
femora rudimentary. 
The discovery of A. martae necessitates a slight modification 
in the definition of the genus shown in the character italicized. 
This interesting genus is confined to S. India and to the 
Indo-Chinese Peninsula so far as is at present known; the S. Indian 
species A. mariae, here described as new, being very distinct from 
its congeners. This distribution of a genus is somewhat unusual. 
Its nearest aliy is Pornothemis from Sumatra and Borneo. 
A. marae is readily distinguished from the two remaining 
species by wing characters, the discoidal triangle in each wing 
being followed by a single row of cells, in A. vacillans and A. 
curvistyla by two tows. The Deccan species is moreover more 
brilliantly coloured, with bright yellow bands on the dorsum of the 
thorax. 
The Burmese species are not so readily distinguished from one 
another. A. curvistyla is distinctly the smaller (hind-wing 18-22 
mm. as opposed to 21°24 mm. in A. vacillans). 
It has also much red on the abdomen, whilst A. vacillans has 
yellowish markings in the young male and female, its adult males 
having the body entirely black. 
Males of these two species are well characterized by the anal 
appendages. In A. vacillans the upper pair are twice as long as the 
