PHILIP A. MUXZ 6 1 



105 (106). Stature very slender, abdomen especially so. Coloration metallic and 

 brilliant, similar in both sexes. Europe, China, Xorth and South America. 

 (Fig. 91.) Nehalennia Selys. i<S5() 



106 (105). Stature more robust, abdomen not extremeK' slender; coloration not 

 ver>- brilliant and dissimilar in sexes 107 



107 (108). Postocular spots elongated, almost linear, with other transverse lines be- 

 tween them. Two small clear spots between the ocelli. Superior appendages of 

 male longer than last abdominal segment and arcuate. Europe, Asia Minor. 

 Japan, South Africa. (Fig. 92.) Cercion" Xa\as, ii;o7 



108 (107). Postocular spots cuneate or rounded, no spots between the ocelli. Su- 

 perior appendages often short and straight 109 



109 (no). Species of Hawaiian Islands. Characters variable. (Fig. 9,"^.) 



Megalagrion-*^ McLachlan, 1S83 



1 10 (109). Xot Hawaiian, nor Australian, otherwise quite cosmoi)olitan. (P'ig. 94.) 



Coenagrion Kirb>-, 1890 

 {Agrion Fabricius, 1775) 



1 1 1 (104). Female with apical spine on segment eight 112 



112 (113). Costal edge of stigma shorter than the proximal or distal edges. Cui 

 reaching the level of base of iVlia, Cuo that of origin of Mo. Postocular spots 

 sometimes disappearing. United States and Mexico. (Fig. t)^.) 



Hesperagrion Calvert, 1902 



113 (112). Costal edge of stigma as long as proximal or distal edges 114 



114 (115)- Mj of hind wing generally arising at or beyond the fourth i)ostnodal, 

 tenth segment of male not elevated. Coloration of male generalh- blue, of fe- 

 male green or yellow, sometimes blue. Cosmopolitan, not in Australia. (Fig. 

 98.) Enallagma Charpentier, 1840 



115 (114). Tenth segment of male elevated and with a bifid dorsal process. Penis 

 with transverse row of short spines at base of distal or spatulate lobe. M-. of 

 hind wing arises at about the fifth postnodal. California. (Fig. 99.) 



Zoniagrion Kennedy. 1917 



116 (103). One or both wings petioled jiractically to or even be\ond the le\el of 

 - Ac 117 



1 17 (108). Pale postocular spots widely confluent with the i)ale color on the rear of 

 the head. M2 arising nearest the fourth jjostnodal in the hind wings and the 

 filth in the front wings. Tarsal claws toothed. Superior appendages of the male 

 bent down almost at a right angle in their apical half, (ienital valves of female 

 reaching far beyond the level of the tips of the abdominal api)endages. West 



Indies to Brazil. (Fig. 127.) Leptobasis-" SeKs. 1877 



-^ Cercion has been shown l)y Kennedy, 1917, Knt. News, to include C. lindenii, C. 

 ([Kadrigerum, and C. piinctum, all formerly considered species of Coenagrion. 



-^ Megalagrion was said by Perkins (Fauna Hawaiiensis \'ol. I, p. clxxv and \"ol. 

 II, pp. 63 to 77 and 693 to 696) to have been separated by McLachlan from the genus 

 Coenagrion on inconstant characters. Kennedy (Ent. News, 191 7), in a study of the penes 

 of many of the Hawaiian species, considers it probable that all the species of those islands 

 may be considered as comprising the genus Megalagrion. 



" Pale postocular spots not always present. Females sometimes with, someiiincs 

 without, vulvar spine. See (52) and (70). 



MEM. .\M. ENT. SOC, 3. 



