58 A VENATIONAL STUDY OF THE ZYGOPTERA 



56 (59). Wing ven- evidently not petioled to the level of Ac; petiolation ceasing as 

 far before it as Ac is long 57 



57 (58). Colors red and dark bronze. Europe and Mediterranean Region to China. 

 (Fig. 89.) Pyrrhosoma Charpentier, 1840 



58 (57). Coloration without red, but is bronze varied with blue, green, or yellow. 

 Europe, Asia Minor, and Chili? (Fig. 90.) . . . .Erythromma Charpentier. 1840 



59 (56) • \^ ing petioled very close to the level of Ac 60 



60 (71). Genera of the Xew World 61 



61 (68). Wing not petioled beyond Ac. Tarsal claw with rather strong inferior 

 tooth 62 



62 (63). Postnodals eighteen to twenty, Cu2 extending to the level of the base of 

 IMia. which arises four or more cells before the stigma. Colors of the dorsum blue 

 and black; yellow beneath the thorax. United States and Canada. (Fig. 108.) 



Chromagrion Needham, 1903 



63 (62). Postnodals fourteen or fewer, Cuo not extending to the level of the base of 

 Mia, the latter arising one to two cells before the stigma 64 



64 (67) .• Coloration not reddish. Abdomen usually thirty or more millimeters 

 long 65 



65 (66). The descending cross-vein from the subnodus continuous to the wing- 

 margin. Rs and M3 narrowly separated at the proximal cross-vein between them. 

 Tooth on tarsal claw well developed but distinctly shorter than the claw. Male 

 inferior appendages well developed. South America. (Fig. 120.) 



Aeolagrion" Williamson, 191 7 



66 (65). The descending cross-vein from the subnodus not continued directly to the 

 wing-margin. Tooth on the tarsal claw large, almost as large as the claw; male 

 inferior appendages rudimentary^ Rs and Ms widely separated at the proximal 

 cross-vein between them. South America. (Fig. 119.) 



Leptagrion Selys, 1876, sens, strict. 



67 (64). Coloration reddish. Tarsal claw with a small inferior tooth. Abdomen 

 generally less than thirty millimeters long. United States and West Indies to 

 Brazil. (Fig. 122.) Telebasis Selys, 1865 



{Erythragrion Self's, 1876) 



68 (61). Wing petioled beyond Ac. Tarsal claw with a very small or no inferior 

 tooth 69 



69 (70). M2 arising nearest the fifth or sixth postnodals in the hind wings; at the 

 sixth or beyond in the front wings. Tarsal claw toothless; superior appendages 

 of male not bent down almost at a right angle in their apical half. Genital valves 

 of the female not reaching far beyond the level of the tips of the abdominal ap- 

 pendages. Central America to Brazil. (Fig. 126.) 



Metaleptobasis Calvert, 1907 



22 This genus includes Leptagrion dorsale, hence Hylaeagrion of Foerster, 1906. Wil- 

 liamson (Entom. News, 191 7, p. 241) arrives at the conclusion that Foerster's Hylaeagrion 

 argentolineatiim is in reality L. dorsale, and his H. croceum Selys is Leptobasis, probably 

 vacillans. Therefore the generic name Hylaeagrion falls, L. dorsale becomes the type 

 of Aeolagrion and L. macrurum is that of Leptagrion. 



