490 ME. HEEBEET CAMPION ON ODONATA 



Labium, labrum, face, and anterior aspect of the frons bright yellow ; dorsal aspect of 

 the frons and vertex metallic bluish-green. Vertex broad, rounded in front, undivided. 

 Occipital triangle black. Lobe of the prothorax smaller than in 0. dokrni, its posterior 

 margin curving convexly, notched slightly in the middle. Ground-colour of the thorax 

 yellow ; a broad black band on each side of the dorsum, enclosing a large yellow oval 

 spot lying on the mid-dorsal carina; a narrower black band traversing the meso- 

 thoracic epimeron longitudinally. 



Wings entirely hyaline. Hind-wing conspicuously broader than the fore-wing — 

 only slightly broader in 0. dohrni. Pterostigma dark brown, 2 mm. long. The 

 venation resembles that of 0. dohrni in the following characters : — The arculus distal to 

 the second antenodal in all the wings ; the branches of M arising near the bottom of 

 the arculus, and fused together for a considerable distance ; the four triangles and the 

 two subtriangles are free; no cross-veins in the supertriangles ; one cross-vein only 

 )etween the bridge and Mi_(_2 ; M2 slightly arched ; only one row of cells between 

 Is. and Rspl. ; the discoidal area of the fore-wing narrow and consisting of an 



Test-figure 40. 



Eight wings of Chla risi, sp. 11. Type c? . Enlarged. E. W. Campion photo. 



undivided row of cells ; the bounding longitudinal veins almost parallel to near the 

 margin of the Aving ; the anal loop in the hind-wmg rudimentary and difficult to 

 recognise; Cui in the hind-wing well separated from the lower corner of the 

 triangle. The venation differs from that of 0. dohrni in the under-mentioned respects : — 

 The fore-wing triangle is less regular in form, as the proximal portion of the costal side 

 (cross-vein) is considerably shorter than the distal portion (M4J ; the base of the 

 triangle in the hind-wing is placed distinctly beyond the level of the arculus, instead of 

 coinciding with it more or less exactly; the cross-vein forming the costal side of the same 

 triangle does not meet, at its distal end, the cross-vein bounding the triangle externally, 

 thus making the enclosure 4-sided (in 0. dohrni the two cross-veins are joined distally, 

 and the enclosure is o-sided) ; 12 complete antenodals in the fore-wing and 9 in the hind- 

 wing, as compared with 9 in the fore-wiug and 7 or 8 in the hind-wing ; 6 postnodals 

 in all the wings (in the six fore-wings of 0. dohrni examined, four have 6 postnodals 



