52 A VENATIONAL STUDY OF THE ZYGOPTERA 



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

 Three antenodals. Tendenc}' 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 Selj-s, 1882 



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

 rangle. Two antenodals. No accessor}' cross-veins before the subqua'drarigle. 

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



Nesolestes Selys, 1891 



29 (22) . No sectors present between Rs and M3. Cui strongly arched beyond MA. 

 One sector between Mm and Mo and one between Mo and Rs. Australia. (Fig. 

 63.) Synlestes Selys. 1869 



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 31 



31 (32). Sectors Mi to Cu2. Many sectors between Cui and Cuo 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 Miand Mia. Cui and Cuo usually ending near together 

 at the wing-margin 33 



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

 at least from Mm to Cui 34 



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

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



35 (34). M3 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 R^and M3. . ■ .38 



38 (41). Supplementary sectors from M^ 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 Mo. Quadrangle not reaching the level of the nodus. South 

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



40 (39)- M3 arising before the subnodus. Not more than two sectors between Mm 

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



Allolestesi^ 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. Ecuador. 



Neuragrion'^ Karsch, 1891 



43 (42) . Antenodals two only 44 



44 (47). M3 separating from M1+2 before the subnodus 45 



45 (46). Supplementary sectors from Mm to M3, often none between M2 and R3. 

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



Dimeragrion Calvert, 1913 



'* Descriptions only were available for these genera. 



