18 THE IMMATURE STATE OF THE ODONATA. 
ZESCHNA. 
Fabricius, Syst. Entom. 
Body stout in proportion. Head, breadth twice the length, flat. Eyes 
large, very prominent, rounded forward, prolonged at inner angles in en- 
larged lobe. Antennz have third joint longest. Mask extends to middle 
legs, large, broad; front border produced in short rounded lobe, cleft at 
middle. Legs longer and stouter than Anax. Abdomen broader; lateral 
spines on segment five or six to nine. Appendages long, sharp ; middle one 
notched at tip; laterals shorter than middle one. Male projection conical ; 
female valve reaching tip of segment. 
9. ASCHNA RUFESCENS. 
Puate V. Fig. 4. 
Vander Linden; Selys, Revue des Odonates, p. 129. 
Nympha skins, male and female. Length, 40 to 44mm.; breadth, 9mm. 
Locality, Vienna, Austria. Raised by Dr. Brauer; Lueneburg, Mr. Heyer ; 
Koenigsberg, H. Hagen. _ 
Stout. Head large, flat, broader than long. Eyes large, very prominent, 
separated from occiput by nearly straight line. Occiput short, hind angles 
rounded and with polished bands on upper side; a polished spot on each 
side of the median line; hind border notched. Ocelli indicated. Anterior 
portion of vertex semicircular. Antennx short, not extending beyond the 
eyes; seven-jointed, third joint longest. Mask extending between middle 
legs, stout; length greater than breadth; enlarged gradually forward ; 
middle third somewhat produced; cleft in middle, with comb of hairs. 
Palpi broad, straight, cut square at end and produced only slightly in end 
hooks, finely denticulated. Movable hooks sharp and bent, thin, just reach- 
ing the base of their opposite. Prothorax not as broad as occiput, hind bor- 
der rounded, Processes enclosing an acute angle, anterior one half length 
of posterior, both sharp. Legs rather slender, hind legs longest, extending 
to eighth segment; femora somewhat arcuated ; two faintly-marked pale 
rings on lower portion of femora. Wing cases extending to fourth segment. 
Abdomen stout, very convex above, tapering from the middle to the tip, 
smooth; two parallel dark dorsal bands best defined at beginning of seg- 
ments. Lateral spmes on segments six to nine, strong, last shorter than 
segment ten. Appendages sharp, long as the last two segments; lateral 
