THE IJIMATURE STATE OF THE ODOXATA. 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 

 equal length, lateral superiors a little shorter; lateral inferiors longest ; middle 

 appendage very slightly notched. Male projection triangular, one third of 

 length of middle appendage. Female valve distinguishable in young specimen. 

 The determination is by supposition ; no species living both in South Caro- 

 lina and Brazil Ijeing 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 jEschnina, 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 sjiread ; 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, -iO mm. length, 

 received from Haskinsville, St. John's River, Florida. 



ANAX. 



Leach, Edinboro' Encyclopaedia, 1S17. XI. p. 1, 137. 



The largest of the ^schnina. 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 leg.s, 

 produced at middle third of front border in short, roimded, 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. 



Plate I. Fig. 1. 



Selys, Eevue des Odonates, p. 110. 



Nympha, male and female, in alcohol and dry; one male just half trans- 

 formed. Length, 52 nun. ; breadth, 10 mm. Locality, Vienna, Austria, 

 raised bj^ Dr. F. Brauer ; Silesia, Schneider. Coll. Mus. Comp. Zool. 



Head very Hat, rather broader than long. Eyes large, more prominent 



