SYNOPSIS OF SPECIES DESCRIBED. 
SUBFAMILY ASCHNINA. 
DIVISION I. — Antenne SEvVEN-JOINTED. 
A. Head longer than broad ; mask extending through hind legs ; front border of mask 
in the middle with two sharp triangular lobes. 
Gynacantha Ramb. (Supposition.) 
Body very slender, flattened; head long; eyes small, not very prominent, slightly pro- 
duced at inner hind angles; occiput sharply prolongated behind on each side; mask long, 
narrow ; lateral spines on segments six to nine. 
1. G. spec. 
Nympha, full-grown. Brazil, South Carolina, and Florida. 
Characters of the genus : appendages sharp; the middle one as long as the inferiors, cut 
at tip, slightly notched; laterals a little shorter; male projection conical. 
B. Head broader than long. 
Anax Leach. 
The giants of the family. Body long, stout ; eyes large, more prominent in the middle 
fajreir) 
of the flat head; mask extending beyond middle legs; front border produced in a short 
rounded lobe, cleft in middle; legs slender; abdomen large; lateral spines on segments seven to 
nine ; appendages strong, sharp, the middle one shorter, notched ; laterals half as long; male 
projection short, cut at tip; female valves shorter than the segment. 
2. A. Formosus Vander Linden. (Raised.) 
Europe ; full-grown nymphe. 
The two processes above first legs short, broad at tip; in right angle, the posterior 
larger; both enclosing a right angle; lateral appendages sharply pointed; male projection 
cut straight. 
