PHILIP A. MUXZ 41 



8(1). Antenodals generalh' two, rarely three to five. Usuall\- no cr()ss-\eiiis in the 

 pubciuadrangle beyond Ac. M3 separating from AIi^2 nearer the siihnodus than 

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

 Xodus 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 basex)f 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 R^ and M3, and between .M3 and 

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



Lestinae (p. 48) 



11 (10). No supplementary sectors between R3 and M3, and between M3 and M4; 

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

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



\2 (9). M3 arising nearer the subnodus than the arculus (half-way in Rhipidolestes). 

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

 Rhipidolestes) i ,> 



13 (18). Cuonot reduced to a vein one cell long nor lacking 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 M2 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. Mi,, not usually 

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

 than one-fourth of the wing length. The number of ])Ostnodal cross-\eins often 

 reduced 16 



16 (17). Definite sui^iilementary sectors present other than Mh, 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 b\- the j^etiolation 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 b\- R,, arising sexeral cells 

 be\-ond the subnodus.) The stigma generally rather hea\>-. 



Megapodagrioninae (p. 50) 



17 (16). NO definite sui)i)lementary sectors other than Mi, 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. 



Coertagrioninae (p. 53) 



18 (13). Cu2 reduced to a cross-vein, ending in the margin of the wing, or in two 

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



MEM. AM. ENT. SOC. 3. 



