XXXI. DESCRIPTIONS OF FOUR NEW 

 INDIAN ODONATA. 



By Major F. C. Eraser, I. M.S. 



All four of the new species belong to the subfamily Agrioninae, 

 two belonging to the tribe Argiini and two to the tribe Agrionini. 



Species of the former tribe are easily distinguished from the 

 latter by the relatively shorter petiolation of the wings. 



Genus Argiocncmis. 

 Argiocnemis graveiyi, sp. nov. 



i 9 , Saugor, Central Provinces, India, 19 — 30-3-19 {F. H. 

 Gravely), T326/H2. 

 Female. 



Head. — Eyes olive green above, greenish yellow beneath ; 

 labium and clypeus flesh coloured, the former with a small, trian- 

 gular, black mark at its base and the latter with three black spots 

 about its middle ; remainder of head black, with no markings. 



Prothorax black, with a sky-blue collar anteriorly and two 

 similar coloured spots on each side, the anterior of which is much 

 the largest. 



Thorax black on the dorsum; a broad, humeral, black line, 

 enclosing between it and the black of the dorsum, a greenish fascia, 

 which is itself traversed by an irregular, black line, incomplete 

 anteriorly. Below the humeral line, the sides pale sky-blue with 

 a minute dot and black streak posteriorly. Tergum spotted with 

 blue. 



Legs creamy white, streaked with black on the extensor surfaces. 



Wings very shortly petiolated ; ac falls on to ab nearer the 

 first antenodal nervure than the 2nd and ab meets the border of 

 the wing opposite the ist antenodal. Postnodals 7 and 6 respec- 

 tively in the two wings. Stigma olive brown. 



Abdomen sky-blue, paler anteriorly and deepening markedly 

 in the last three segments. A broad, black fascia runs the whole 

 length of the dorsum as far as segment 8, where it is continued on 

 to the dorsum of segment 9 as a tongue-like process which does not 

 attain to the apical border ; tenth segment entirely blue, as also are 

 the anal appendages. 



Length of abdomen 22 mm. Length of hind- wing 15 mm. 



Argiocnemis dyeri, sp. nov. 



i cf , old bed of Nerbudda, North of Babai, Hooshangabad 

 Dist., Central Provinces, India, 15-3-19 {F. H. Gravely). (A 



