BORNEAN DRAGONFLIES. 61 
some rather marked differences in venation. These two specimens 
are, I believe, to be referred to O. splendidus de Selys. It is 
evident from Ris’ study of the venation of three males belonging 
to this species, that there is a considerable amount of individual 
variation to be looked for, and the agreement between them and 
de Selys’ type is close in other respects. 
One of the specimens has been returned to the Sarawak 
Museum, and unfortunately I did not before returning it make 
full notes of the venational formula for both pairs of wings. 
ah ony An.n. Pn.n. M. Cu.  t. (cells). suprat. 
—26 —13 —2 —9 —3 =) 
i —20 —19 iG le Sie Shc —4 
26—25 14—13 3—2 8—8 2—2 s—5 
cf 138—14, 20—18 17—18 ae 8—8 3—3 56—4 
(de Selys’ 23—25 14 ep Cand fee ome 
type.) aes Pus BY ie 
The most marked difference between Mr. Moulton’s specimens 
is in the anal loop. In Ris’ photograph of the type g¢ from 
Kosempo that area contains 19 cells. 
Further, in Moulton’s specimens in 1. there are only 2 rows of 
cells in the space between Cu, and A, almost to the margin of 
the wing, whilst in 2. there are on the right side 4 rows and on 
the left 6 rows; in the type male there appear to be 6 rows. 
The wings of the Bornean specimens are coloured as follows :— 
Base and apices of wings suffused with bright golden brown, on 
the fore wing reaching to the inner angle of the triangle, and 
on the hind wing one cell beyond the arculus; at the apices the 
colour begins rather nearer to the pterostigma than to the nodus, 
and is fainter on the anal margin of the wing. 
The basal postcostal nerve is absent in these female specimens; 
it is present in the male figured by Dr. Ris. 
The colouring of the head, thorax, and body is as described for 
the male. 
The chief measurements are :— 
Length of abdomen circa 56 mm. 
Length of hind wing 48 mm.; breadth 17°5 mm. 
[OROGoMPHUS ATKINSONI de Selys.* 
Orogomphus atkinsoni Selys, 4™° Add. Synops. Gomph. p. 682 
(1878); Kirby, Cat. p. 79; Selys, Ann. Mus. Civ. Genova, 2. x. 
(p. 49 sep.) (1891); Williamson, loe. cit. p. 278, figs. 5, 6 (1907). 
1 2, Bhowali. 
(Indian Forest Research Institute per Dr. Imms.) 
* Not recorded from Borneo. 
