FASCICULI MALATENSES 
195 
LEGION LIBELLAGO 
The distribution of Rhinocypha^ perhaps the most characteristic Oriental 
Odonate genus, presents several features of interest. Firstly, it is noteworthy 
that no species of the genus is known from Ceylon. Compare with this the 
absence of the genus Draco among lizards, and Diplommatina and Alycaeus amongst 
the land Mollusca ; all three otherwise widely spread and characteristic of the 
whole Oriental region. It will be interesting to learn whether other cases of 
this nature occur. 
Following De Selys, the genus may be subdivided roughly as follows : — 
A. Two rows of postcostal cells (often rudimentary) ; opaque marks on hind wings of 
males, with hyaline ‘ windows.’ 
1. Group of R. quadrimaculata. 
B. A single row of postcostal cells. 
[a) Opaque marks on the hind wings of the males, with hyaline windows. 
2. Group of R. perforata. 
{b) Opaque marks on hind wings without ‘ windows ; ’ the females in some 
cases also have opaque marks on the hind wing. 
3. Group of R. tincta. 
Group I is mainly Himalaic, and as far as I know, confined to the main- 
land of Asia. R. fenestrella., its representative in the Peninsula, which is very 
closely allied toi^. quadrimaculata^ Selys, of India, and to R. spuria^ Selys, of 
the Khasia Hills, extends further south than any other species of the group. 
Group 2 has one species in Thibet, viz., R. trimaculata ; the remaining 
species range from India to Cochin China and Hainan, and down into the 
Peninsula and the greater Sunda Islands, but not further east than Java. The 
Peninsular species are R. hiforata and R. apicalis. 
Group 3, typified by R, tincta^ is capable of further sub-division, but this 
cannot be attempted within the limits of the present paper. It contains 
numerous species ranging from Sumatra and the Peninsula, where it is repre- 
sented by the interesting little R. karschi^ intermediate between R. heterostigma 
and R, tincta., and by R. petiolata^ to New Guinea. 
Thus in the Peninsula, and apparently there only, the three groups over- 
lap. 
9. Rhinocypha fenestrella, Ramb. 
Rhinocypha fenestrella, Kirby, Cat. Odonata^ p. 113 (1891); Selys, Ann. Mus. 
Civ. Genoa (2) x, p. 491. 
8 (J , 29. Bukit Besar, 2,500 feet, Nawngchik. May, 1901. 
