52 A VENATIONAL STUDY OF THE ZYGOPTERA 



27 (28). Wing petiuled to the level of about one-third the length of the quadrangle. 

 Three antenodals. Tendency to a cubito-anal cross-vein before the subquad- 

 rangle in addition to the vein Ac. Arculus not beyond the last antenodals. 

 West Africa. (Fig. 62.) Neurolestes Selys, 18S2 



28 (27). Wing petioled to the level of one-half to two-thirds of the length of the quad- 

 rangle. Two antenodals. No accessory cross-\eins before the subquadrangle. 

 Arculus distinctly beyond the second antenodals. Madagascar. (Fig. 61.) 



Nesolestes Selys, 1891 



29 (22). No sectors present between Rs and M^. Cui strongly arched beyond IMA. 

 One sector between Mia and M. and one between M2 and Rs. Australia. (Fig. 

 5^.) Synlestes Selys, i86q 



30 (5). Rs arising at least a cell beyond the subnodus. M3 usually not before the 

 subnodus, at least not a cell's length before it. The wing petioled to beyond the 

 level of the arculus 3 ^ 



31 (32). Sectors Mi to Cu2. Many sectors between Cui and Cu2 so that the dis- 

 tance on the hind margin between these two veins is as great as that from the 

 level of MA to the end of Cu2. Quadrangle very long, almost or quite reaching 

 the subnodus. Wing greatly petioled. Mexico to Central America. (Fig. 64.) 



Paraphlebia Hagen, 1861 



32 (31). No sectors between M.and M^. Cui and Cuj usually ending near together 

 at the wing-margin 33 



33 (36). The area behind Cu2 of two or three rows of cells. Supplementary sectors 

 at least from M la to Cui 34 



34 (35). Ms arising at the subnodus. Ac is slightly beyond the le\el of the first 

 antenodal. New Guinea. (Fig. 65.) Wahnesia Foerster, 1900 



35 (34). Ms arising slightly beyond the subnodus. New Guinea. 



Metagrion'^ Calvert, 1913 



36 (33). The area posterior to Cu2 of one row of cells only 37 



37 (48). Supplementary sectors rather numerous. Some between Rs and M3. . . .38 



38 (41) . Supplementary sectors from Mia to M4. Old World genera 39 



39 (40). Ms arising from M1+2 at the subnodus. Often more than two sectors be- 

 tween Mia and M2. Quadrangle not reaching the level of the nodus. South 

 Africa. (Fig. 66.) Chlorolestes Selys, 1862 



40 (39). Ms arising before the subnodus. Not more than two sectors between Mia 

 and M2. Quadrangle long, reaching the level of the nodus. Seychelles. 



Allolestes^^ Selys, 1869 



41 (38). No sectors between Ms and M4. Genera of South America 42 



42 (43). Antenodals more than two, at least in the hind wings. Fcuador. 



Neuragrion'^ Karsch, 1891 



43 (42) . Antenodals two only 44 



44 (47). Ms sei)arating from M1+2 before the subnodus 45 



45 (46). Su])i)lementary sectors from M^, to Ms, often none between M2 and R3. 

 Usually an accessory cross-vein between Cu and A. Guiana. (Fig. 67.) 



Dimeragrion Cahert, 1913 



" Ucscriptions only were available for these genera. 



