1885.] 251 



pale yellow, very short, nearly quadrate, scarcely extending to tlie commencement 

 of the dilatation of the superior, hardly narrowed to the end, which is excised, with 

 the angles upturned and produced into an acute black tooth ; the lower surface is 

 flattened with the sides strongly upturned, upper surface deeply concave ; within 

 each outer angle is an elevated black blunt tubercle, which, if viewed laterally, 

 conveys the erroneous impression of belonging to the edge and not to the inner 

 surface. 



? (very adult). Generally similar to the $ . 



Wings very strongly and almost uniformly tinged with bright greenish-yellow 

 (slightly paler at base and at extreme apex), which is sometimes more intense on the 

 nervules, leaving the centre of the cellules paler. 18 — 19 ante-cubital neirules in 

 the anterior-wings. 



Back of head for most part blackish. 



Abdomen stouter ; the dorsal dark line more distinct : 10th segment transverse, 

 its apical edge with a large transverse impression (or fovea) on either side of a median 

 production, in which are about four short longitudinal impressed striae. 



Appendages very small (about h\ mm.), black, in the form of small flattened 

 leaflets narrow at the base, with straight outer edge, and a slight central keel ; apex 

 acute. Valvules not exceeding the 9th ventral segment, black, provided with small 

 and short reddish appendages, of which the second joint consists of several bristles. 

 [I think a second ? (with equally yellow wings) must belong here. It differs 

 in the black spot of the top of the front being conical instead of nearly orbicular, in 

 the slightly smaller wing dimensions (post.- wing, 50 mm.), and especially in the much 

 shorter abdomen, which (appendages absent) is only 50 mm. long, without appearing 

 to have lost any of its length (excepting the appendages'), although it has been 

 broken and mended.] 



The figures represent the apex of abdomen of $ and ? (with 

 appendages), from above, and the inferior appendage of $ , from side, 

 more enlarged. 



Hob. : Madagascar. 



The $ of this insect is essentially peculiar from the form of the 

 anal appendages, and the ? from the uniformly-tinted greenish-yellow 

 wings. The $ of A. dorsaUs, Burm., from the Cape of Good Hope, 

 remains, I think, unknown, but from Hagen's detailed description of 

 the ? type (Verb, zool.-bot. Ges. AVien, 1SG7, p. 37), it cannot belong 

 here, according to the form of the spot on the top of the front, the 

 markings of the abdomen, and especially the colour of the legs. 



From the same collection from Madagascar I have a ^ Anax that 

 it would be difficult to separate f rom ^. /orwosMS, but as has been 

 already remarked with regard to South African examples, probably of 

 this species, the body is slightly more slender, and the labrum mar- 

 gined with brown instead of black. 



Lewisham, London : 



March, 1885. 



