272 CLASSIFICATION [CH. 



anal loop well-formed, variable. Genitalia of seg. 2 of male with divided 

 hamuli. Female with prominent valvula vulvae. Larva usually smooth, 

 with large head somewhat triangular in front ; eyes large and rounded ; body 

 and legs short (fig. 36 G). 



Tribe 6. Leucorrhiniini (fig. 134). 



Sectors of arculus separate or only slightly fused. Lobe of prothorax 

 large, erect, divided and strongly ciliated (as in some genera of Tribe 5 also). 

 Wings at least partly coloured, usually with a dark patch at base of hindwing. 

 Other characters as in Tribe 5. 



Tribe 7. Trithemini (fig. 135). 



Porewing with nodus considerably distad from the middle of the wing; 

 a consequent increase in the number of antenodals; the last one usually 

 incomplete. Sectors of arculus united, less so in fore than in hindwing. 

 Arc. usually between Ax 1 and Ax.,. Anal loop long, with outer angle reaching 

 far beyond level of triangle ; toe well- developed ; midrib complete from base 



Fig. 135. Wings of Dythemis velox Hagen, <J, Central America. 

 (Hw. 32 mm.) Original. 



to toe, and bent at an obtuse angle, sometimes approaching a right angle. 

 Lobe of prothorax usually slender. Male with divided hamuli, but the outer 

 lobe reduced. Female with very small vulvar scale. 



Larvae resembling those of Tribe 5. 



This tribe includes two series: 



Series 1. Trithemis-Series. Old World. 



Series 2. Dythemis-Series. New World. 



