BORNEAlSr DBAGONFLIES. 327 



The males of these four species are at first sight very much 

 alike. Thej may be discriminated as follows : — 



A. Opaque colouring of hinder-wing begins at nodus or one or 



two cells before. Its margin runs transversely across the 

 wing; never a dark subcostal band extending to the wing- 

 base. 

 Abd. 35 -f 1 mm., h. w. 27-5 mm, P. tricolor Selys. 



B. Opaque colouring of hinder-wing begins about half-way 



between wing-base and nodus. Its margin runs obliquely 

 outwards and backwards, and is rather irregular ; usually 

 a hyaline indentation a.bont 4-6 cells deep between M^ 

 and OUj. Dark band in subcostal space of all four wings 

 extending to wing-base in adult specimens, reaching the 

 nodus in the fore-wing. Apex of fore-wing tipped with 

 dark })rown from the middle of the pterostigma. 

 Al)d. 30 -f- 1 mm., h. w. 25 mm. P. suhcostalis Selys, 



C. Opaque area of hinder-wing begins at about two-thirds of 



the distance from the wing-base to the nodus, but area 

 hetiveen M,+^ffi«fZ R is always hyaline iip to nodus. Daik 

 subcostal stripe not so well marked as in P. suhcostalis, 

 and scarcely indicated on the fore wing, which also has 

 much less opacity at its apex. 



Abd. 35-|-l mm., h. w, 28-30 mm. P. subnodalis Laidlaw. 

 I). Hinder-wing opaque from the base to apex except for the 

 basal space, and for certain quite irregular areas which 

 in some specimens occur on the wings. Costal and sub- 

 costal spaces of fore-wing dark l^rown up to nodus, 



Abd. 35 + 1 mm., h. w. 27-28 mm. P. hasalis Laidlaw. 



Unfortunately I do not kni:)w the females. 



These species probably all l)elong to the group /'. rariec/ata 

 (Ramb.). The group occurs in all parts of the Sondaic area. 



115. PSEUDOPH.EA [MPAR, IN.^^QUIPAIi (Selys). 



Psetulophcea inceguijmr Kirby, Cat. Odonata, p, 109. 



4 c? J. Tatau. 



At most these are but a local race of the older species /'. ivipar 

 (Selys) from Malacca and Sumatra. 



Its nearest allies seem to be /'. dispar (Ramb.) and P.fraseri 

 Laidlaw from W. India, though the relationship is not very close. 



116. Dysph^a lugens Selys. 



Dysphcea Ingens Kirby, Cat. Odonata, p. 110. 



2^d d. Limbang River, iv. 10. 1 $ (?). Retuh, 16, v. 14. 



The wings of the female specimen show in light hyaline brown 

 a col our- pattern identical with that of the male. 



cS . Abd. 38 mm. 4- 1-5 mm., h, w. 32 mm. ^ . Abd. 30 mm., 

 h. w. 29 mm. 



