22 THE IMMATURE STATE OF THE ODONATA. 



Similar to JE. cyanea. Body shorter, and stouter in proportion. Head 

 flatter. Eyes larger and more prominent, separated from occiput by nearly 

 straight line. Vertex more in the same plane with the eyes. Occiput 

 shorter and straighter behind. Bands on hind angles less marked ; color 

 grayish; a pale elongated spot on each side of median line, and a narrow 

 pale band on hind angle, often scarcely discernible. Mask long, extending 

 through middle legs, gradually enlarged ; front border a little more than 

 twice width of base; middle third of front border somewhat produced and 

 rather widely cleft, with comb of hairs. Palpus broad, rounded at upper 

 angle, and produced in very short black teeth at lower angles; denticulatiou 

 beneath discernible ; movable hook, reaching the base of opposite one. 

 Prothorax as broad as back part of occiput, rounded behind. Processes 

 stout and blunt, not much separated, anterior more contracted. Legs very 

 slender ; hind legs extending to ninth segment, ash-gray ; femora with two 

 pale rings. Wing cases extending to middle of fifth segment. Abdomen 

 short, stout, tapering from seventh segment; dorsum very convex; finely 

 granulated as in JE. cyanea, but with whitish hairs ; color grayish ; each seg- 

 ment with eight darker impressed spots, four on middle and two on each 

 side near margin. Segments of nearly equal length, except tenth, which is 

 half as long; lateral spines on segments six to nine; that of ninth nearly 

 as long as tenth segment. Inferior appendages as long as two last segments, 

 triangular, sharp; middle appendage notched, not so long as inferiors; lat- 

 eral superiors rather more than half length of middle one, cylindrical, slen- 

 der, and sharp. Male projection conical, rather sharp, nearly as long as lateral 

 superiors. Male genital parts slightly marked ; female valve extending some- 

 what beyond nintli segment. 



15. ^SCHNA AFFINIS. 



Plate V. Fig. 3. 

 Vander Linden ; Selys, Revue des Odonates, p. 124. 



Nympha, male, i-aised by F. Brauer. Length, 33 mm. ; breadth, 7 mm. 

 Locality, Vienna. 



Similar to JE. mixta. More slender in proportion. Eyes not so large or 

 prominent. Occiput more i-ounded. Mask shorter and broader in propor- 

 tion, extending through middle legs, enlarged gradually forward, so that 

 front border is twice as broad as base ; middle third not so produced as in 

 JE. mixta, and finely cleft, with a comb of hairs. Palpus broad and straight 



