BORNEAN DRAGONFLIES. 341 



Lestes sp. 



1 cj" . Matang Rd., 21.viii. 20 (lacking head and end of 

 ■ abdomen). 



Wings hyaline, but with smoky tinge, most marked at apex ; 

 petiolated up to level of Ac, which lies nearer Ax., than Ax,. 

 M^ commencing 8j-9 cells distal to nodus in fore-wing, 6^-7 

 cells in hinder-wing. ISTone of the sectox^s angulose except Cu.,. 

 Prerostigma large, dilated, about four times as long as broad. 

 One supplementary sector and vestige of a second interposed 

 between M., and M^. Quadrangle broad, lower side twice as long- 

 as upper side ; outer angle acute. 



This interesting s^Decies shows distinct aifinities to the Indo- 

 Chinese Orolestes. 



There are also amongst Major Moulton's material some three 

 fragmentary specimens, all Agrionines, which are too imperfect 

 to describe. They appear to be unnamed species. One is a 

 Pseiulagrioii ; a second is either a Pseudagrion or belongs to an 

 allied genus ; the third I cannot refer with certainty to any 

 genus, though again it may be related to Pseudagrion. 



I have omitted from the list certain common and widely-spread 

 species which almost certainly occur in Borneo, but which have 

 never yet been recorded from the island. These would add some 

 ten species or so to the list. 



Allowing for these liroken or unrecorded species, we may, I 

 think, assu.me that the list includes from between 70 to 80 per 

 cent, of the total Dragontly fauna of the island. 



III. Some Remarhs on Geographical Distribution. 



Dragon flies are so important in this respect that a few notes 

 are not out of place. 



It is difficult to subdivide the Oriental Region in any entirely 

 satisfactory way ; but one may contrast the equatorial Dragonfly 

 fauna, ranging from about the equator to roughly 10° JST., with 

 the tropical fauna lying mainly between 10° N. and 25° N. The 

 equatorial fauna may be called the Malayan, the tropical (unless, 

 indeed, that can be shown to consist of more than one fauna of 

 co-ordinate importance) I label here the Indo-Chinese. 



The Malayan fauna occupies as its main areas : — 



i. The Sondaic area — i. e., the Malay Peninsula, Borneo, 



Sumatra,, and Jav^a. 

 ii. The Philippine Islands, 

 iii. The Celebes. 



Any detailed analysis of the fauna of Malaya Avould extend 

 this paper to undue length : hence I give only a very general 

 table, and prefix "so far as I know"' to the whole. 



23* 



