CORDULEGASTER. 115 



a stripe and line, and the sides with two broad oblique stripes, a 

 line between them, yellow; feet Tery long, black; abdomen long, 

 cylindrical, the dorsum black, with a stripe upon the middle, and 

 each side a ventral one, yellow; appendages short, yellow, the 

 superior ones stout, incurved at apex, bidentated beneath, the 

 inferior appendage quadrangular, broad, incurved at the apex; 

 wings subfumose, pterostigma long, brownish-black. 16 — 19 ante- 

 cubitals ; 13 — 14 postcubitals ; 2 discoidal areolets. 



Length 73 — 78 millim. Alar expanse 104 — 114 millim. Ptero- 

 stigma 6 millim. 



Hdb. New York (Dr. Asa Fitch); Wisconsin (Kennicott); 

 Columbia. 



Division II. Labium bifid. 

 CORDULEGASTER Leach. 

 Eyes subcontiguous. 



1. C. sayi. 



Cordulegaster sayi Selys ! Monog. Gomph. 331, 109. Selys ! Synops. 85, 

 106. 



Black, spotted with yellow ; head yellow, rhinarium black ; tho- 

 rax jDlack, dorsum with two stripes, sides each with two stripes and 

 an intermediate line, yellow; feet black; abdomen long, black, 

 annulated with yellow ; appendages of the male black, superior 

 ones trigonal, divaricated, with a basal tooth beneath, the inferior 

 appendage quadrangular; appendages of the female yellow; vulvar 

 lamina elongated, bifid; wings hyaline, pterostigma long, yellow; 

 membranule whitish. 18 antecubitals ; 11 postcubitals; 2 disc- 

 oidal areolets. 



Length 60 millim. Alar expanse 84 millim. Pterostigma 4J 

 millim. 



Hdb. Georgia (British Museum). 



It is similar to C. annulatus Charp., of Europe. 



2. C. maculatus ! 



Cordulegaster maculatus Selys! Monog. Gomph. 337, 111. Selys ! Synops. 

 86, 108. Aeschna obliqua Say, var. A ? Jour. Acad. Philad. VIII. 

 16,8. 



Brownish-black, hairy, spotted with yellow ; head yellow, with 



