remarkable neio genus and new speeies of Odonafa. 171 



same colour apparently continued narrowly along the dorsum of 

 3rd segment ; 9th segment yellowish or orange above, probably 10th 

 segment partly marked with the same colour. Proximal ends of 

 segments 4, 5 and 6 above and 3, 4, 5, 6 and 7 beneath marked or 

 ringed with whitish. 



Superior appendages longer than 10 and rather shorter than 9. 

 Viewed from above they are broadest at the base at first slightly 

 divergent then rather abruptly they converge becoming flatter 

 or somewhat concave after the geniculation. About half-way 

 between the head and the rounded apex, above, an interruption 

 simulating a joint. Feen from the side these appendages are nearly 

 straight and void of striking character save the indication of the 

 false joint. 



Inferior appendages about J as long as the superior. Viewed in 

 profile, they are somewhat triangular with a conspicuous process ; 

 seen from beneath they are closely approximate for about two- 

 thirds of their length, each terminating in a divergent curved process ; 

 between these processes there appear to be blades with spinulose 

 edge. 



Wings hyaline very faintly tinged with brownish, especially 

 between costa and radius. Pterostigma short and broad, dark 

 brown or blackish with a large orange spot which touches the costa. 



$. unknown. 



Length of abdomen, 34 mm. ; hind-wings, 22 mm. 



I have pleasure in dedicating this interesting species 

 to Dr. Fr. Ris, Rheinau, the distinguished Monographer of 

 the Libelluninae, in recognition of many kindnesses received 

 at his hands during a friendship of over twenty years. 



Of Austrahan genera, Cliorismagrion is perhaps most 

 closely related to Synlesfes, although diffeiing therefrom 

 in several important respects in addition to the absence 

 of the basal side of the quadrilateral in the fore- wings. 

 In Synlestes the anterior side of the quadrilateral is about 

 one-half the length of the posterior side; M^ separates 

 from M 1 -f 2 proximal to the sub-nodus ; Rs at the sub- 

 nodus; Cu^ and Cu"-^ more closely approximate at their 

 origin, Cu^ more strongly arched. Supplementary sectors 

 present. 



To the South African genus Chlorolestes, the relation of 

 Chorismagrion is also rather close. In this genus, M^ 

 separates from M 1 4-2 at the sub-nodus : Rs at Pnq 2 ; Cu^ 

 less strongly arched than in Synlestes; supplementary 

 sectors present. 



