CAMPION— ODON ATA 441 



Gynacantha is one of the dominant genera of Aeschninae, and has numerous repre- 

 sentatives in Africa, Asia, and America. G. stylata was described from a unique $ from 

 Mahe, preserved in M. Martin's collection, and has been stated by that author to 

 resemble G. bispina Ramb., a species occurring in Mauritius, Madagascar, and Africa. 

 The following particulars of the $, which hitherto has been unknown, can now be given : — 

 Total length 68'5 mm. Length of abdomen, including anal appendages, 54*5 to 57 mm. 

 Coloration of head, thorax, pterostigmata, and legs as in male. Wings faintly tinged with 

 yellow at the base as far as the triangle ; the yellow fills the costal and subcostal spaces 

 before the nodus, and extends along the costa until the pterostigma is reached. Pterostigma 

 4'5 mm. in length, surmounting from 4 to 5 cells. Reticulation reddish-brown ; membrane 

 with copperish glint. The branch of the radial sector departing before the level of the 

 pterostigma brace-vein. Two cells in subtriangle. Forewing 47 mm. long, and with 

 22 to 25 antenodal and 18 to 19 postnodal cross-veins. 5 to 8 cells in triangle. 

 Hindwing 46 mm. long; 16 to 18 antenodals and 20 to 22 postnodals. Five cells in 

 triangle. Anal loop with 11 cells (August specimen) or 12 cells (September specimen); 

 supplemental anal loop 5 -celled, 6-celled or 7 -celled. 



Abdomen reddish-brown, with the greenish coloration of the thorax reappearing upon 

 parts of segments 1, 2, and 3. Segment 9 carrying below a pair of apical two-jointed 

 filaments. Segment 10 ending above in an obtuse point ; produced below into a tongue 

 directed backwards and downwards, presenting a glossy-black, triangular, concave surface 

 dorsally, and terminating with a pair of long, curved, glossy-black spines, forming a fork. 

 Anal appendages 6 '5 mm. long (about the length of segments 8, 9, and 10 taken together), 

 flat, narrow, lanceolate, clothed with short hairs, reddish-brown. Ovipositor-spine reddish, 

 very smooth and glossy, curving upwards towards the end of the abdomen, which its 

 length about reaches, thin, and sharply pointed. 



The specimen obtained in September, which may be taken as the type of the ? , has 

 been placed in the British Museum. 



Agrionidae. Lestinae. 



17. Lestes ochraceus Selys (Synopsis) {foi^ma)*. 



Lestes ochracea Selys (Synopsis), Bull. Acad. Belg. (2), xiii. p. 325 (1862). 



Loc. Aldabra : 8 <J, " found round pools in rocks at all seasons " (Fryer). Cosmoledo : 

 1 ^, 1 ?, 1907 (Thomasset). 



For the identification of this species I am indebted to Monsieur Ren^ Martin, who 

 says, however, that he finds some differences between the specimens submitted to him 

 and those which he considers to represent true ochraceus. He adds that there are, in 

 Africa, several closely- allied species falling into the ochraceus group. 



Lestes ochraceus was described by De Selys from the male sex alone, the habitat 

 being given as Africa, probably the Cape of Good Hope. The terminal segments of the 

 abdomen were unknown to De Selys. 



* See postscript, p. 446. 



56—2 



