18 THE IMMATUEE STATE OF THE ODONATA. 



^SCHNA. 



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. AntennaB 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. iESCHNA RUFESCENS. 



Plate V. Fig. 4. 



Vander Linden ; Selys, Eevue des Odonates, p. 129. 



Nympha skins, male and female. Length, 40 to 44 mm. ; breadth, 9 mm. 

 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. Antennas 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 somewdiat 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 spines on segments six to nine, strong, last shorter than 

 segment ten. Appendages sharp, long as the last two segments; lateral 



