62 A VENATIONAL STUDY OF THE ZYGOPTERA 



Ii8 (117). Pa'e postocLilar spots not widely confluent with the pale color on the 

 rear of the head 119 



119 (124). Female with apical spine to segment eighths 120 



120 (121). Genus of the New World. Colors bronze and blue or greenish. The 

 eighth or ninth or tenth segments blue. End of tenth more or less prolonged or 

 turned back. Mexico to South America. (Fig. no.) 



Acanthagrion Selys, 1876 



121 (120). Genera of the Old World 122 



122 (123). Ms arising before the subnodus; front wing with twelve to fifteen post- 

 nodals. Coloration yellowish, greenish and bluish with black markings. Kili- 

 manjaro and Meru, Africa Mombagrion^^ Sjostedt, 1909 



123 (122). Ms arising almost at the subnodus; front wing with nine to twelve post- 

 nodals. Coloration black, blue, and dark green. Malaysia and West Africa. 

 (Fig. 123.) Aciagrion Selys, 1892 



124 (119). Female without apical spine on segment eight 125 



125 (128). Genera of the New World 126 



126 (127). Tips of the wings similar, abdomen very long and slender. Tenth seg- 

 ment of male not forked. Coloration greenish or yellowish. Mia arising one or 

 two cells before the stigma. Eastern United States and Brazil. (Fig. in.) 



Telagrion Seljs, 1876 



127 (126). Tips of front and hind wings of male unlike; Ri and Mi in the hind wing 

 almost unite at the tip. Segment ten of the male with a tubercle above and two 

 spines. Coloration bluish or reddish, or brownish. IMexico to Central America. 

 (Fig. 125.) . . ; Anisagrion Selys, 1876 



128 (125). Genera of the Old World 129 



129 (138). Ms arising quite distinctly before the subnodus. Tarsal claw generally 

 with an inferior tooth 130 



130 ( 1 33) . Prothorax of female provided with two hooks which project forward . .131 



131 (132). Ac at or but slightly beyond the level of the first antenodals, not more 

 than one-fourth the distance to the second ones. Coloration blue. Australia. 

 (Fig. 107.) Caliagrion Tillyard, 191 2 



132 (131). In Australian species, at least, Ac is about one-halfway between the first 

 and second antenodals. Superior appendages of male usually forked or hollowed 

 at tips. Africa and Asia to Australia. (Fig. 114.) Pseudagrion Selys, 1876 



133 (130)- Prothorax of female simple, no hooks present 134 



-* Skiallagma sometimes has traces of postocular spots; female unknown. See descrip- 

 tion in footnote to rubric forty-two. 



Myagrion, female unknown. Male described as follows: Color carmine-red. Quad- 

 rangle irregular, upper side contained in the lower two and one-half times, in the front 

 wing. Cu2 thirteen cells long. M> arises six cells beyond the subnodus in the front 

 wing, five in the hind wing. Abdomen very slender, legs short, tibial spines weak. 

 Tergum of tenth abdominal segment produced into two spines, but without a tubercle 

 such as occurs in Anisagrion. Appendages scarcely as long as these spines. South 

 -America, Foerster, 19 1 4. 



-' Studied from description only. 



