26 THE IMMATURE STATE OF THE ODONATA. 
Similar to Auschna grandis, stout. Eyes rather large and more prom- 
inent. Ocelli indicated. Antennx very small; third joint length of first 
and second and twice as long as fourth. Occiput more deeply notched than 
in Aschna grandis, sides oblique and rounded ; a number of polished bands 
on upper side. Mask extending to between middle legs, broad, enlarged 
eradually 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 twice 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 Aéschna Januaria, Hagen’s Sy- 
nopsis, Aischna castor, Brauer, Voyage of Novara, and two or three species 
not yet described. . 
Two nymphe from Rio Janeiro, Brazil, are similar, but belong probably 
to a related but different species. 
BRACHYTRON. 
Evans, British Libellulina, 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. 
eT 
