184 Records of the Indian Museum [Vol. XVI, 



Enallagma ? parvum, Sel3^s. 



Enallagma 1 parviim, Kirby, Cat. Odouata, p. 147 (1890) ; Morton, 



Trans. Ent. Soc. London, 1907, p. 307. pi. xxiv, figs. 13, 14. 

 Ischniira immsi, Laidlaw, Entomologist, 1913, pp. 236-237, text-fig. 



I (^, Darjiling, alt. ca. 7,000 ft., vi-vii-i6 {E. Bi'unetti). 



Recorded by Morton from Deesa, Gujerat ; and by Selys from 

 * India.' The typ'^ specimen of Ischnura immsi, from Sonder 

 Bhandara in the Central Provinces, is in the British Museum. 



In size this tiny species equals the small forms of •Agriocnemis. 

 It is probably deserving of generic separation from the true 

 Enallagmas. The female has not been described and I have 

 not seen an example. 



Genus Aciagrion (Selys). 



A character which is constant for all the species of the genus 

 that I have been able to examine, but one which I have not 

 seen noted, is that the pterostigma of the fore-wing is slightl}^ 

 though distinctly larger than that of the hinder- wing, in both 

 sexes, its outer margin being at the same time rather more 

 oblique. 



Aciagrion is, I think, very closely related to Enallagma and 

 ma3" be regarded as a specialized off-shoot from that genus, to 

 some extent replacing it in the Oriental region. It is not, so far as 

 I can judge, allied to the Amphicnemts-Teinohasis series even 

 nearly so. 



Aciagrion olympicum, sp. nov. 



(Text-fig. r.) 



4 (^(T, 2 ? $, Sureil, Mangpu, Darjiling district, 5,000 ft., iv-v-17 

 (.S-. W. Kemp). 



Length of abdomen, cf 34 mm., 2 32 mm. : of hind-wing, 

 cf 22 mm., 2 22 mm. 



13 post-nodal nerves on fore-wing, pterostigma whitish-brown, 

 darker in the centre. 



This fine new species is, so far as I know, the largest of 

 the genus. It has a very remarkable colouration, a soft brown- 

 grey ground with brown black markings. It thus resembles rather 

 A. pallidum, Selys, than A. hisopa, Selys, in the latter species 

 the abdomen being conspicuously marked with blue. 



Male. 



Head. — Upper lip pale brown, with a fine black line at its base. 

 Ante-clypeus brownish- white with a black line running transverse- 

 ly across its summit. Post-clypeus and frons brownish-white to 

 a level just beyond the base of the antennae. Vertex and 

 occiput rich brownish-black ; with a pair of large oval post-ocular 

 spots of whitish-brown, united across the occiput by a narrow- 

 band of the same colour. Posterior surface of head brownish-white. 



Eyes. — Upper pole gray-brown, separated b}^ a darker belt 



