PHILIP A. MUNZ • 57 



(B) "Arculus at, or very near to, the second antenodal; M2 on the hind wings arising 

 nearest the fourth postnodal; costal edge of the stigma of the hing wings shorter 

 than the proximal or distal edges; Cui and Cu2 not reaching as far distad as the 



level of origin of Mia and M2 ; A separating from the hind 



margin proximal to, or less frequently at, the cubito-anal cross-vein , 



which is situated nearer the level of the first than of the second antenodal; venation 

 of the tips of front and hind wings similar, abdomen chiefly red, tenth segment of 

 the male not elevated dorsally, vulvar spine?" Considerable orange and red in 

 the coloration, with black markings. Brazil. (Fig. 96.) 



Tigriagrion Calvert, 1909 



43 (48). Wing not petioled all the way to Ac 44 



44 (47). Genera of the New World 45 



45 (46). Abdomen chiefly red. The costal side of the stigma not shorter than the 

 proximal or distal sides. Cui extending at least to or beyond the level of the base 

 of Mia, Cui to or be>ond that of M,. In the hind wing the inner end of the quad- 

 rangle not as long as the upper side. North and South America. (Fig. 88.) 



Amphiagrion Selys, 1876 



46 (45) . Abdomen generally with some red. The costal edge of the stigma is shorter 

 in the hind wing than the proximal •01' distal sides. Venation otherwise much like 

 the preceding. Mexico and United States. (Fig. 95.) 



Hesperagrion Calvert, 1902 



47 (44) . Genus of the Old World. Front margin of the stigma longer than the pos- 

 terior one. Quadrangle exceedingly narrow. South Abyssinia. 



Thermagrion-' Foerster, 1906 



48 (43) . Wing petioled to or be\ond Ac 49 



49 (50). A genus of the Old World. Coloration largely black and blue. Tibiae with 

 long spines. Lower tooth of tarsal claw almost as large as the upper. Oceanica. 

 (Fig. 116.) Xiphiagrion Selys, 1876 



50 (49) . Genera of the New World 5i 



51 (52). Ms not arising very close to the subnodus, but at least one-half cell before it- 

 Coloration light, much red. Color pattern of dorsum of thorax with no markings 

 darker than brown. Some blue often jiresent. South America and Western 

 North America. (Fig. 109.) Oxyagrion Sehs. 1876 



52 (51). M3 arising very near the subnodus, not more than one-fifth of a cell before 

 it. Abdomen chief!)- reddish and yellowish. (Fig. 127.) 



Leptobasis Selys, 1877 



54 (42). Female without apical spine on segment eight 54 



54 (55). Two complete rows of cells beyond the stigma between C and Ri. this area 

 much broader than the corresponding one between Ri and Mi. The wing-margin 

 slighth- indented at the stigma. Considerable red in the bod>- coloration. East 

 Indies' (Fig. 87.) ^ Oreagrion Ris. 1913 



55 (54). Rarely two complete rows of cells beyond the stigma between C and Ri. 

 Wing-margin not indented at the stigma 56 



" Studied from description only. 



MEM. AM. EXT. SOC, 3. 



