60 MR. F. F. LAIDLAW ON 
appendage is much less deeply cleft and its limbs are pointed, not 
truncate. 
2 2. Matang Rd. 
In details of venation these two specimens differ considerably 
from one another. 
Formula :— 
Gana An.n. Pn.n. M. Cu.  t. (cells). suprat. 
22—23 12—11 38—3 8—7 2—2 5—6 
A (type) ... —_——. — — —— 
10—10 19—20 14—14 3—4 9—9 3—3 6—6 
- 22—22 12—10 3—3 8—9 2—2 5—5 
14—14 20—20 14—15 4—3 9—9 3—3 6—5 
The difference is most marked in the anal area. Not only is 
the number of cells here greater in specimen B than in A, but 
there is also a marked difference in the number of cells lying 
between the fork of Cu,: in A these cells lie in two rows, and, 
excluding the marginal cells, are 9 in number; in B, on the other 
hand, they are disposed in three rows and number 13 and 11. 
As in the males the inner side of the triangle of the hinder 
wings is the shorter, though in this sex the difference is not very 
strongly marked. 
The type-specimen, A, evidently the more mature, has the 
wings suffused with a golden-brown tinge throughout; most 
marked at the bases and apices. The colour is richest about the 
periphery of the cell, the central part, especially at the apices of 
the wings, being often distinctly paler. B, the younger specimen, 
has the wings almost colourless, but with a very faint yellow 
tinge between the nodus and pterostigma extending down the 
wing as far as M,. 
The colouring of the head, thorax, and body scarcely differs 
from that found in the male. 
The following are the principal measurements :— 
Length of abdomen: ¢ 53mm., 9 56 mm. 
Length of hind wing: ¢ 38mm., 2? 42 mm.; breadth ? 
14 mm. 
In both sexes a basal postcostal nerve is present. 
Type ¢ & Q will be deposited in the British Museum. 
OROGOMPHUS SPLENDIDUS de Selys. (PI. I. fig. 8.) 
Orogomphus splendidus Selys, 4™° Addition Synops. Gomph. 
_p. 681 (1878); id. Anal. Soc. Espah. Hist. Nat. xi. p. 16 
(1882); Kirby, Cat. Odonata, p. 79; Martin, Mission Pavie, 
p. 14 (sep.) (1904); Williamson, loc. cit. p. 278 (1907); Ris, 
Suppl. Entom. Deutsch., Ent. Mus. No. 1, 1912, pp. 77, 79, 
fig. 15a, b, Taf. iii. figs. 1-6, Taf. v. fig. 5. 
Mr. Moulton has forwarded me two female specimens pre- 
sumably belonging to one and the same species though showing 
