Plate LVIII 



NymphdJ Struct urcs 



Enalldgma sp., ci'oss-si'etioii of the lioail tliniugli the 



hyj)(jj)liai'ynx and maxillae. 

 Enallagma sp., cro.ss-section of the liead caiidad of the 



section shown in Figui'c 1. 

 Enallagma sp., ero.ss-.scction through tlie lal)iuiii. 

 Enalldfjmd sp.. longitudinal section of the head. 

 Listfs forcipdtus, anal segments and bases of gills. 

 EiuillafjiiKi sp., eross-seetion of labium near hinge. 

 EnaUdfjinu rxsutdiis, ventral aspect of the head with 



the labium folded iiack and the reinaiinng inouth- 



I)arts in position. 

 Afirion mdculatum, la])iuni. 

 Ilctdfrimi dmcricdnd, labium. 

 Lrstcs forciptttus, labium. 

 Arfjid violdccd, labium. 

 Isdindni virlicdlis, labium. 

 l-hidlhif/ma ciininnildl iim. labium. 



