THE IMMATURE STATE OF THE ODONATA. 13 
darker on posterior segments, not well marked on the anterior ones. Side 
border somewhat projecting. Segments six to nine have lateral spines. Ap- 
pendages nearly equal in length to segments nine and ten, sharp of nearly 
oth, lateral superiors a little shorter ; lateral inferiors longest ; middle 
is 
equal len 
appendage very slightly notched. Male projection triangular, one third of 
leneth of middle appendage. Female valve distinguishable in young specimen. 
The determination is by supposition; no species living both in South Caro- 
lina and Brazil being known; indeed no species of Gynacantha is known 
in the United States. This is, however, not of so much importance, as Baron 
de Selys has described a species from Mexico. The nympha plainly belongs 
to /Eschnina, and its abnormal shape strongly points to Gynacantha; at least 
no other genus so abnormal is known. The different species of Gynacantha 
are very similar and are widely spread ; and as a species is described from 
Mexico and three from Cuba, one may also be found in South Carolina; this 
is even more probable by one full-grown female nympha, 40 mm. length, 
received from Haskinsville, St. John’s River, Florida. 
ANAX. 
Leach, Edinboro’ Encyclopedia, 1817. XI. p. 1, 137. 
The largest of the Aschnina. Head large, flat, breadth greater than 
length. Eyes large, forming two thirds of head, prominent, broadest at 
posterior portion, much produced at inner angle. Antenna have third joint 
longest. Occiput rounded at hind angles. Mask extending to middle legs, 
produced at middle third of front border in short, rounded, cleft lobe. Legs 
very slender. Abdomen large, lateral spines on segments seven to nine. 
Appendages long, sharp; middle one notched at tip. Male projection short, 
cut straight at tip. 
2. ANAX FORMOSUS. 
Prats I. Fie. 1. 
Selys, Revue des Odonates, p. 110. 
Nympha, male and female, in alcohol and dry; one male just half trans- 
formed. Length, 52mm.; breadth, 10 mm. Locality, Vienna, Austria, 
raised by Dr. F. Brauer ; Silesia, Schneider. Coll. Mus. Comp. Zodl. 
Head very flat, rather broader than long. Eyes large, more prominent 
