48 A VENATIONAL STUDY OF THE ZYGOPTERA 



Key to the Genera of the Subfamily Lestinae 



1 (2). The distal end of the quadrangle cut off almost squarely. The front wing 

 over one-third longer than the hind wing. A short sector present in the fore 

 wing between Mi and Mia. In the hind wing a sector present between M4 and 

 Cui. The distance between the points of origin of M3 and the bridge to Rs is 

 almost as long as that from the origin of M3 to the arculus. Hainan. (Fig. 38.) 



Pseudolestes Kirby, 1900 



2 (i). The distal end of the quadrangle is not cut off squarely. The fore and hind 

 wings of about the same length. No sector between Mi and M^ (e.xcept in 

 Ortholestes). The distance between the origin of M3 and that of the bridge to Re 

 is less than the distance from the origin of M3 to the arculus 3 



3 (4). The quadrangle widened distally and with the superior side over one-half the 

 length of the inferior. Xo sectors between M3 and M4. Two rows of cells be- 

 tween M4 and Cui at the end of Cui, at least in many specimens. West Indies. 

 (Fig. 39.) r Ortholestes Calvert. 1891 



4 (3). The quadrangle not widened distally and with the superior side scarcely 

 one-half the length of the inferior. One or more sectors between M3 and M4, 

 e.xcept in Orokstes. One row of cells between M4 and Cui. 



5 (6). The inner end of the quadrangle in the fore wing almost one-half the length 

 of the lower side. M1+2 forking less than two cells beyond the subnodus. The 

 third antenodal space almost twice the length of the first. California to Vene- 

 zuela. (Fig. 40.) Archilestes Selys, 1862 



6 (5). The inner end of the quadrangle one-third or less of the length of the lower 

 side except in Orolestes. M1+2 forking more than two cells beyond the subnodus, 

 at least in one wing. The third antenodal space not more than one and one- 

 half times the length of the first 7 



7 (8). Wing petioled to within Ac's length of itself. No sectors between M3 and Rs. 

 The longest sector between M2 and Rs arises about one-half of the way between 

 the stigma and the origin of Mia. Mja not zigzag. India. (Fig. 41.) 



Megalestes Selys, 1862 



8 (7). Wing petioled to Ac or nearly so. Sectors present between M3 and Rs. The 

 longest sector between M2 and Rs not arising more than three or four cells before 

 the level of the stigma 9 



9 (10). Wings, at least those of the male, with large opaque areas. Cuo is the only 

 zigzag vein. Stigma very large, surmounting four to six cells. M1+2 forking 

 five to seven cells beyond the subnodus. India. . . .Orolestes'- McLachlan, 1895 



10 (9). Wings hyaline. Many of the veins strongly zigzag ; i. e. the cells are angled. 

 Stigma shorter, surmounting two to three cells. M1+2 forks three to seven cells 

 beyond the subnodus 11 



11 (12). Stigma broad, scarcely two and one-half times as long as wide. Rs zigzag. 

 The anal appendages of the female ovoid, very much depressed, as long as the 

 tenth segment. A single species, from East Indies.. .Platylestes'^ Selys, 1862 

 ** Descriptions only have been available for these genera. 



