38 MR. F. F. LAIDLAW ON 



of the genus. Wings hyaline with green and lilac iridescence, 

 R., rises from nodus, M 3 distal. 



Head : Upper surface entirely black with a feeble bronze reflex, 

 except for a pale band on the anteclypeus and for the third joint 

 of the antennae which is light brownish yellow. 



Prothorax : Middle lobe primrose-yellow, anterior and posterior 

 lobes green- bronze. 



Thorax : Dorsal surface entirely green-bronze ; lateral surface 

 of the same colour with a fairly broad primrose-yellow band ; the 

 metepimeron likewise primrose-yellow, as are the under surfaces. 



Abdomen dull bronze-black, the under surface paler, and seg- 

 ments 3-8 each with a primrose-yellow apical triangular mark 

 on the ventral side. 



Legs yellow, posterior surface of tibia dark brown as is the 

 tibio-femoral articulation. Tarsi becoming darker. 



Anal appendages longer than segment 10. Upper pair bronze- 

 black, lower pair rather paler. The upper appendages are each 

 curved strongly downwards, ending in a flattened leaf-shaped 

 lobe, its apex directed downwards, carrying well-developed spines 

 on its margin. 



The lower pair are each stout and club-shaped, with a strong 

 internal tooth near the base. Towards their outer extremities 

 each carries a curious slender projection curving at first down- 

 wards and then backwards, flattened laterally at its apex (text- 

 fig. 5 B). These appendages present a very striking appearance, 

 and are quite unlike those of the only other male of the genus in 

 which the appendages have been figured (P. foersteri Laidlaw, in 

 Fascic. Malayensis, Odonata, pt. 2, sep., p. 9, fig. 2 A, B). 



It seems to me perfectly reasonable to suppose that this speci- 

 men belongs to a species distinct from P. versicolor Laidlaw, a 

 species of which only the female is known. 



At present five species belonging to the genus have been 

 described. Two of these are recorded from the Celebes, i. e. 

 P. simplicinervis Selys and P. gracilis Kirb} r . These are both 

 large species and each has a wing-measurement of about 30 mm. 

 The three remaining species (P. foersteri, P. versicolor, and 

 P. kinabaluensis) described by me are smaller, with a wing- 

 measurement of less than 25 mm. 



P. foersteri, from the Malay Peninsula, has its anal appendages 

 quite different in appearance from the present species. P. versi- 

 color is distinguishable by its remarkable colouring. 



20. Ceriagrion sp. 



1 S i segments 6-10 of abdomen missing (No. 70, 1914). 



Belongs probably to an undescribed species. 



At first sight it would pass for C. erubescens Selys. However, 

 the origin of A* is distinctly proximal to CuN ; the dorsum of 

 the thorax is of a rich, warm, brown colour, with a coppery 

 reflex. 



