SYNOPSIS OF SPECIES DESCRIBED. 



SUBFAMILY u^SCHNINA. 



DIVISION I. — Antennae Sevenwoixted. 



A. Head longer than broad ; mask extending through hind legs ; front border of mask 

 in the middle with two sharjj triangular lobes. 



Oynacantha Hamb. (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, fnll-gi-own. 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. 

 Ana:s Leach. 



The giants of the family. Body long, stout ; eyes large, more prominent in the middle 

 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 nj'mplue. 



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. 



