260 PROCEEDINGS OF THE ACADEMY OF [May, 



TTTT. — Supplementary sector one between ^Iia and 

 M2, one cubito-anal cross-vein, quadri- 

 lateral not reaching the level of the nodus 



Protolestes Foerster, 1899 (Madagascar). 

 AA. — Ma separating from M1+2 at the subnodus, only two antenodals^ 

 Rs beginning distad to subnodus. 



Y. — Area posterior to Cu2 with usually two 



or more^* rows of cells, A separating from 



the hind margin distad to the level of the 



arculus. 



W. — Supplementary sectors from Mi to Cu2 



or to hind margin; two cubito-anal 



cross-veins, the second under the Cjuadri- 



lateral Paraphlebia Hagen, 1861 



(Mexico, Guatemala). 



WW.- — Supplementary sectors from Mia to 



Cui or to hind margin,' one cubito-anal 



cross-vein Wahnesia Foerster, 1900 



(New Guinea)^* 



VV.— Area posterior to Cu2 with one row of 



cells, one cubito-anal cross-vein. 



X. — Supplementary sectors from Mio to 



M4, A separating from hind margin at 



or distad to arculus 



' Chlorolestes Selys, 1862 (South Africa). 



XX. — Supplementary sectors confined to 



area Mia to M2, A separating from hind 



margin proximad to, at, or distad to^ 



the level of the arculus 



Heteragrion Selys, 1862 



(Mexico to Argentina) .^^ 



AAA. — Ms separating from M1+2 distad to the subnodus, only two 



antenodals, Rs beginning distad to the subnodus, A separating 



from the hind margin distad to the level of the arculus (or not 



developed as separate from the hind margin in Perilesfes). 



Y. — xVrea posterior to Cu2 with two or 

 three rows of cells. 

 Z. — Supplementary sectors from Mi to 

 Cu2 or to hind margin, other charac- 

 ters as above under W 



Paraphlebia (see W). 



9* Both sexes of Paraphlebia duodecima Calv. have only one row of cells posterior 

 to Cu2 on the hind wings, but two or more rows on the front wings. 



95 This is group IB of Argiolestes in Selys' Revision of 1886, p. 81. 



56 In his Synopsis of 1862, p. 31, de Selys suggested the separation of H. petiola- 

 hini as a separate subgenus under the name of Oxystigma, chiefly distinguished 

 from Heteragrion by the long quadrilateral reaching almost to the level of the 

 nodus, the pterostigma extremely, pointed proximally and only one antenodal 

 cell (between Mi and Cui), but he did not adopt this suggestion in his Revision, 

 of 1886. The name Qxysligma does not appear in Kirby's Catalogue. 



