HAGEN AND CALVERT: ILLUSTRATIONS OF ODONATA. 119 
EXPLANATION OF PLATES. 
Except where otherwise stated, the figures represent the apex of the abdomen 
and the appendages of the males. For most species two views are given, a dorsal 
and a left profile ; the former is designated by an arabic numeral, the latter by the 
same numeral, followed by the letter a. 
PLATE i, 
Figs. 1, la. Argia variabilis. 
Figs. 2, 2a. “ medullaris. 
Figs. 3, 3a. “ insipida. 
Figs. 4, 4a. “  funebris. 
Figs. 5, 5a. “ _vivida. 
Figs. 6, 6a. “  extranea. 
Figs. 7, 7a. ‘“« ~~ orichalcea. 
Figs. 8, 8a. ““  cuprea. 
Figs.9,9a.  “ — translata. 
Figs. 10, 10a. “ — sedula. 
Kigs: 11, ila: “  infumata, 
Figs. 12, 12@. “  oculata. 
Figs. 13, 18a. “ — ealida. 
Figs. 14, 14a. “ mollis. 
Figs. 15, 15a. “ — eliptica. 
Figs. 16,16a. “  pulla. 
Figs. 17,17a. “ violacea. 
Figs. 18, 18a. ‘“‘ fumipennis, 184, ventral, and 18c, posterior view of same: ie 
tubercle on posterior surface of tenth segment ; v, appendix 
dorsalis of Heymons (Grundziige der Entwickelung u. des 
Korperbaues von Odonaten u. Ephemeriden, Anhang Abhdl. 
konigl. preus. Akad. Wiss. 1896) = “inferior appendage ” of 
authors in the Odonata Anisoptera; x, superior appendage of 
authors (processus caudalis of Heymons); y, inferior appen- 
dage of authors (appendix lateralis of Heymons); z, anal 
aperture. 
Figs. 19,19a. “ optata. 
Fig. 20. “  sordida, major part of labium. 
