ON BORNEAN DRAGONFLIES. 51 
4, Contributions to a Study of the Dragonfly Fauna of 
Borneo.—Part II. The Gomphine and Chlorogomphine. 
By F. F. Laiptaw, M.A., F.Z.S. 
[Received October 18, 1913: Read February 17, 1914. ] 
(Plate I.*) 
INDEX. Page 
Structure: 
WEEN OE OFM DIO Socacec cae cdg coe see bas bor ocB cedor ace Goksdn pre cou eos DOF 
Geographical Distribution : 
Gomphinz and Chlorogomphine of Borneo...................:c000:.0. 51 
Systematic : 
Ictinus acutus, sp. i. Rae RAE sete nace 51 
Burmagomphus ver mmiculatae Qtr sila SEOs Woces coos 55 
Heterogomphus icterops Martin, borneensis subsp. n.? ............ 57 
Introductory remarks.—I have dealt at some length with the 
venation of the various species discussed below, more especially with 
the species belonging to the Chlorogomphine ; chiefly because all 
of them, and especially the latter, are very rare in collections, 
and because they are of particular systematic interest to the 
student of the Odonata. 
With regard to the distribution of these members of the 
Dragonfly fauna, too little is known to admit of dogmatic state- 
ments or even of useful discussion. The genera which seem to 
be essentially characteristic of the Great Sunda Islands are 
Macrogomphus and Microgomphus, the latter unknown beyond 
their limits; all the other: genera here recorded have a wide 
distribution in the Orient, and in the case of /ctinws beyond it. 
At the same time the Gomphine fauna of Tropical Asia is as 
sharply characterized as that of any other quarter of the earth. 
Ictinus AcUTUS, sp.n. (Selys nom.) (PI. I. fig. 1.) 
26 6. Baram, Oct. 1910. 
Length of abdomen 45 mm. + 3 mm.; hind wing 36 mm.; 
pterostigma 5 mm. 
Venation :— 
19 or 20 13 or 14 3-4-celled ¢ e celled 2 
ANTM AI ae AT a ol fea Dee OEE, wast Se: se 
14 or 15’ Pn i Peasant 7 eal .3-celled’ supr.t “9 
Belongs to the group /. decoratus de sei | : 
Wings tinged with brown ; orange at the base—in the fore wing 
for about one-third the length of the median space, but excluding 
the cubital space ; in the hind wing almost up to the arculus. 
Pterostigma brown. 
Head: Upper lip yellow, edged with black, the black reaching 
* For explanation of the Plate see p. 63. 
4* 
