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'^2. Roster, D. A., 1888. — "Coutributio alio studio delle forme laivali 



degli Odonati." Cenno Iconographico della Laive-Ninfe dei Caudo- 



branchiati." /.c, xx., 1888, pp. l.lW-lTd. Pis. i.-iv. 

 :W. Rousseau, E., 1909. — "Etude nionojjjiaphique des larves des Odonates 



d'Euiope."' Ann. Biol, lacustre, Riuxelles. iii., 1909, pp. 300-366. 

 34. St'HMiDT-ScHWEDT, E., 1891. — " Kei fe u. KerHarven d. siissen 



Wasseis, besonders der stehenden Gewasser.' In 'M)ie Tier u. 



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pp..51-12'2. Leipzig, J. J. Weber. 

 3a. Si{ARr, I).. 1901. ^"Cambridge Natural History. Insects, Part i.'" 



Chap, xviii. ; dragonflies, pp. 409-428. 

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EXPLANATION OF ABBREVIATIONS USED IN TEXT-FIGURES 

 AND PLATES. 



a, anus — ac, amcebocyte — aJ, alveolus — aln, alveolar nucleus — hip, blood - 

 plasma — c or c', cercoid — cu, soft inner layer of cuticle — cu', hard outer layer 

 of cuticle — dh, dorsal blood-canal — dl, principal dorsal internal lamina — dn, 

 dorsal longitudinal nerve of gill — DT, DT, dorsal tracheal trunks — ect, 

 ectotrachea — ent, or end, endotrachea — /;, hair (on cuticle) — he, htemoecele 

 — hy, hypodermis — ?7, internal lamina — W, secondarj^ internal lamina — 

 leg, /g, or L, lateral caudal gill — mc, miocyte (oat-shaped corpuscle) — 

 meg, mg, or M, median caudal gill — ><p, spiral thread of endotrachea — tr, 

 main longitudinal trachea of gill — tr\ branch trachea of gill — ch, ventral 

 blood-canal — rl, principal ventral internal lamina — rn, ventral longitudinal 

 nerve of gill — S-10, abdominal segments. 



