I9I9-] F- F- lyAiDLAW : Indian Dra^onflies. 189 



B. Ab rises before level of Ac. (See note under C. nielan- 

 iintfn.) ^ abdomen white, segments 7-10 marked 

 with black. 



I. Upper anal appendages nearly quadrate, not half 

 as long as segment 10. Lower pair stout, directed 

 upwards ... ... ... ... C melanurnm, 



Selys. 

 II. Upper anal appendages elongate, more than half as 

 long as segment 10; lower pair tapering, directed 

 backwards ,. ... ... ... C. falla.x. Ris. 



(See also Rec. Ind. Miis., XII, pp. '.:;2-i35, iQio)- 



Ceriagrion coerulcum^ sp. 



nov. 



I (J, Pashok, Darjiling distr., E. Himalayas, 2,000 ft., May- June, ic)i6 

 [F. H. Gravely). 1414/H.1. 



Length of hind-wing 27 mm., of abdomen 38 mm. 



i\b rising from Ac. Pterostigmata dull brown, extreme base 

 of wings tinged with saffron, 12 antenodals on the forewing. 



The colour may be described as uniformly delicate blue 

 on the dorsal surfaces, fading to a yellowish- white ventrally. 



Segments 9 and 10 of the abdomen are marked with brownish- 

 black; 9 has a rather nebulous cruciform mark of that colour and 

 the whole of the dorsum of 10 is so coloured. 



The legs are yellowish-white with black spines. 



The superior anal appendages are brownish-black, the lower 

 pair yellowish- white, with black extremities. 



The apical margin of the tergum of the tenth abdominal 

 segment has an angular excision, about one-third of the length 

 of the segment in depth. 



The anal appendages are very similar to those of C. olivaceum, 

 the upper pair are about two-thirds as long as segment 10, directed 

 horizontally backwards, truncate, with a downwardly projecting 

 point at the apex. The lower pair are a little longer ; relatively 

 slightly stouter than in C. olivaceum. 

 2 unknown. 



This fine species is chiefly remarkable for its colouring, which 

 is strikingly different from that of other unicolorous members 

 of the genus. It is, I think, undoubtedly related to C. olivaceum 

 more closely than to other species. 



C. cocruleum is further of interest as it is, so far as I know, the 

 only Asiatic species in which the wings are tinged with colour ; in 

 addition to the basal saffron the whole wing has a faint yel- 

 low hue. 



Mr. H. Campion has very kindly examined the unique ex- 

 ample of this species and has given me his opinion on it. 



He suggests that the transverse ridge across the frons is not 

 so well defined as in typical Ceriagrion^ and thinks that this and the 

 colouring are to be regarded as reasons for not referring this 

 species to Ceriagrion. 



He suggests a possible relationship to an African genus 

 Thermagrion of Forster, but adds that as the female of the present 



