PHILIP A. MUNZ 41 



8 (i). Antenodals generally two, rarely three to five. Usually no cross-veins in the 

 subquadrangle beyond Ac. M3 separating from Mi+2 nearer the subnodus than 

 the arculus, except in the Lestinae, none of which have more than two antenodals. 

 Xodiis usually from one-fifth to one-third of the distance from the base of the 

 wing to the tip. The quadrangle crossed in Anomisma only. 



(Family Coenagrionidae) 9 



9 (12). M3 arising nearer the arculus than the subnodus. The base of R^ (properly, 

 the base of the bridge to Rs) arising before the subnodus and generally as near the 

 arculus as the subnodus 10 



10 (11). Supplementary sectors present between R3 and M3, and between M3 and 

 M4. Cui and Cu2 well developed, extending considerably beyond the subnodus. 



Lestinae (p. 48) 



11 (10). No supplementary sectors between Rs and M3, and between AI3 and M4; 

 two between Mi and Mia. Cui one cell long and not reaching the subnodus. 

 Cus reduced to a cross-vein Lestoidinae (p. 49) 



12 (9). Ms arising nearer the subnodus than the arculus (half-way in Rhipidolestes). 

 The bridge to Rs short, arising at or beyond the subnodus (slightly before in 

 Rhipidolestes) I3 



13 (18). Cuauot reduced toa vein one cell long norlacking 14 



14 (15). Stigma difi"used or lost, not made up of one cell, but if present, usually of 

 several cells, and irregular in shape, not braced. The longest vein between Mi 

 and Mo rather more parallel to M2 than to Mi. Nodus at from one-fourth to 

 one-seventh the wing length. Many postnodal cross-veins. 



Pseudostigmatinae (p. 49) 



15 (14). A true stigma present, usually braced at the inner end. Mia not usually 

 parallel to M2, when any other sectors are present. Nodus generally at more 

 than one-fourth of the wing length. The number of postnodal cross-veins often 

 reduced ^" 



16 (17). Definite supplementary sectors present other than M^and arising at least 

 as far in the wing as under the stigma. (No such sectors in Chorismagrion or 

 Perilestes, but these genera can be recognized by the petiolation of the wing which 

 extends almost to the level of MA, by the quadrangle coming near to the posterior 

 wing-margin, by the arching of Cui beyond MA, and by Rs arising several cells 

 beyond the subnodus.) The stigma generally rather heavy. 



Megapodagrioninae (p. 50) 



17 (16). No definite supplementary sectors other than M^ are present, except oc- 

 casional very irregular ones which are only a few cells long and do not arise more 

 than a few cells from the wing-margin. Stigma generally rather small. 



Coenagrioninae (p. 53) 



18 (13). Cuo reduced to a cross-vein, ending in the margin of the wing, or in two 

 genera to a \ein one cell long Protoneurinae (p. 63) 



MEM. AM. ENT. SOC, 3. 



