BORNEAN DRAGONFLIES . 31 



Measurements of the hind wings of Mr. Moulton's specimens 

 indicate possibly that the species presents an example of dis- 

 continuous variation. In eight of the males the wing-length is 

 about 37 - 5 mm., with an extreme range between 37 mm. and 

 38 - 5 mm. In all these specimens the length of the abdomen lies 

 somewhere about 48-52 mm. 



In the rest of the males the length of the hind wing is 

 decidedly less, about 34 mm., and of the abdomen roughly 

 44 mm. 



Three of the females are large (length of hind wing 37*5 mm., 

 37 - 5 mm., 39 mm. respectively) ; the other two smaller, with a 

 measurement of 35 mm. apiece. The length of abdomen varies 

 broadly as the length of the hind wing. The figures are, of 

 -course, too small to admit of any certainty, but suggest a dis- 

 continuous variation in both sexes. 



The more mature specimens of both sexes, whether large or 

 small, show the smoky shading of the wings, especially'near the 

 margins. The younger individuals have the body of an intense 

 emerald-green, in the older a more golden tone prevails. 



11. Pseudoph^a subnodalis, sp. n. 



13 S 6, 1 ?• 16.9.13, 30.9.13, 1.10.13 (Nos. 11, 14, 15, 23, 

 24, 52, 60, 70, 72, 75, 1914). 



Hind wing: <J 27-28 mm., $ 27 mm. About 26 An.n. 



Abdomen : d 1 33-35 mm., $ 27 mm. About 28 Pn.n. 



This species is, I believe, in all probability identical with the 

 " larger examples " spoken of by Selys in his original description 

 of P. sihbcostalis. From examples of both species that I have 

 been able to examine from several localities they differ in certain 

 well-marked and constant characters. 



P. subnodalis is distinctly larger. In none of the series is 

 there a black ray in the subcostal space of the fore wing, and on 

 the hind wing the space between R and Mi +2 is always un- 

 coloured up to the level of the nodus. The auricles on the second 

 abdominal segment are relatively and actually larger than in the 

 allied species. 



In the fully adult male the whole body is a rich velvety black, 

 excepting the upper lip and gena?, which are blue in colour and 

 have a porcellanous texture. 



Younger males show traces of pale yellow dorsal and lateral 

 markings on the thorax. Both pairs of wings have a distinct 

 brownish tinge, deepest in the costal spaces. The lower wing 

 has its basal third, roughly speaking, hyaline ; but the subcostal 

 space in several specimens has a dark ray, its middle third is 

 metallic blue or green, and its distal third is black. As already 

 remarked, the space bounded by R and Mi + 2 is always hyaline 

 up to the nodus ; for the rest the inner margin of the metallic- 

 blue colouring is irregular, but advances most nearly to the base 

 of the wing in the space between M3 and M 4 . The outer margin 



