BY R. J. TILLYAKD. 191 



along over the pools the incongruity of its colouring strikes one 

 almost as ludicrous, the brilliant golden-yellow, followed by an 

 almost equally brilliant blue, refusing to harmonise, and producing 

 the same effect on the eye as in the case of some brilliantly- 

 coloured tropical bird. 



9. Ceriagrion glabkum Burm. 



This is a common species in tropical Africa. M. Rene Martin 

 informs me that Baron de Selys-Longchamps, received specimens 

 uf this insect labelled " Queensland," but that he considered some 

 error had been made. It is, at any rate, a remarkable fact that 

 this species should exist in two so widely separated localities. In 

 Australia I took it first at Brisbane, and have since received it 

 from Mackay and Cairns. It is probably exceedingly local, but 

 not uncommon where it occurs. It inhabits the reedy parts of still 

 lagoons and waterholes, and is found climbing up the stalks of 

 the reeds. 



This species is about 40 mm. long, head and thorax dull brown, 

 very smooth; abdomen of £ a beautiful reddish-pink throughout, 

 appendages short and blunt; abdomen of <J brownish. 



10. Agriocnemis pruinescens, n.sp. 



<J. Total length, 32 mm.; abdomen, 25 mm.; wings, fore 16mm., 

 hind 15 mm. 



Wing s. — Pterostigma very small, rhomboidal, pale transparent 

 brownish, except at the inner inferior angle, which is black. 

 Nodal Indicator 2 8 I Last postnodal of forewings, and some- 



|2 6-7 1 

 times also of hind wings, not continuous. 



Head —Epicranium black. Eyes black above, a dull grey 

 mark behind, green below; autennce black; ocelli brownish. 

 Posldypeas narrow, black; auteclypeas very narrow, greenish, 

 edged with black. Labrum greenish-blue. Labium and man- 

 dibles pale dirty brown. 



T h o r a x. — Protkorax black, shaded with dark grey. Maso- 

 aud metathorax deep black, slightly metallic, a little bluish-grey 

 bloom low down on the sides. Underside covered with bluish- 

 grey bloom. Legs dull black, underside of femora greyish. 



