26 THE IMMATURE STATE OF THE ODOXATA. 



Similar to iEsclma grandis, stout. Eyes rather large and more prom- 

 inent. Ocelli indicated. Antenna? very small ; third joint length of first 

 and second and twice as long as fourth. Occiput more deeply notched than 

 in iEschna grandis, sides oblique and rounded ; a number of polished bands 

 on upper side. Mask extending to between middle legs, broad, enlarged 

 gradually forward, middle third produced in short rounded lobe, cleft, sides 

 of cleft rounded and on each side a small black tooth. Palpus denticulated, 

 cut straight at tip, movable hook extending somewhat beyond base of oppo- 

 site one. Prothorax rounded behind ; processes sharp, enclosing rather less 

 than right angle ; posterior nearly tw'ice as long as anterior, and bent back- 

 ward. Legs rather slender ; femora arcuated ; hind legs reaching middle of 

 seventh segment. Abdomen broad and stout, rather densely covered with 

 short yellow hairs ; dorsal band dark ; lateral spines on segments six to nine, 

 spine on ninth shorter than tenth segment. Appendages rather longer than 

 two last segments, very sharp ; lateral superiors nearly as long as inferiors, 

 very sharp; middle appendage somewhat shorter and deeply notched. Male 

 projection conical, rather sharp, one half length of middle appendage. Fe- 

 male valve reaching somewhat beyond ninth segment. This species cannot 

 be determined. It may perhaps belong to a peculiar group named Ura- 

 cantha by De Selys. To this group belong ^schna Januaria, Hagen's Sy- 

 nopsis, iEschna castor, Brauer, Voyage of Novara, and two or three species 

 not yet described. 



Two nympluB frona Rio Janeiro, Brazil, are similar, but belong probably 

 to a related but different species. 



BRACHYTRON. 



Evaus, British LibeUulina, p. 22. 



Body elongated, lateral spines on segments six to nine, slender. Head 

 rather small and convex ; base of occiput narrow. Eyes small in proportion. 

 Front border of mask produced in oblique angle, cleft ; no teeth. Legs 

 rather short. Appendages short ; middle one somewhat shorter than in- 

 feriors, cut at tip; laterals short. Male projection conical; female valve not 

 reaching tip of segment. 



