762 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



EXPLANATION OF PLATES. 



Pi..\TE XXXI. Nyinj)hal wings (photomicrographs). 



Fig. L Wings of Gontphna dexcrijdus Banks, nymph full grown. 



2. Wing of Lestes r-ectcmgularis Say, grown nymph, showing the radial sectof 



attached to the median trachea. 

 8. Portion of hind wing of young nymph of Anax Junius Drury, previous to thi 



development of any veins, showing the first indications of bridge, trianglfl 



and anal loop. 



Pi.A'i'K XXXII. Nymphal wings (photomicrographs). 



Fig. 1. Small portion of wing of a nearly grown nymph of Anax Junius Drury, witl 

 veins developing, showing the formation of the radial supplement {i 

 supj)l. ) and of the brace vein between veins A/^ and Af^. 

 2. The basal part of the fore wing of a nymph of Lanthus parvulus Selys, show-j 



ing the formation of the arculus and the triangles, 

 o. The nodal region of the same wing, showing the formation of the bridge and 

 the obli(ine vein. 



Plate XXXIIL 



Fig. 1. W^ings of (joiiij>Iins dilalatus Hamhur. 



2. Wings of Gomphoides stigmatus Say. 



3. Wings of AphjiUa producta Selys. 



Plate XXXIV. 



Fig. I. Wings of CycJopJiyUa diphylla Selys. 



2. Wings of Proijomplms ohscurux Rambur. 



3. Wings of Gomphidia sp? 



Plate XXXV. 



Fig. 1 . Wings of Gomphus vulgatissimus Linnaeus. 



2. Wings of Hemigomphus ochraceus Selys. 



3. Wings of Lanthus parculus Selys. 



Plate XXXVI. 



Fig. 1. Wings of Ttichopteri/x ihorqii Selys. 



2. Wings of Ulula sp ? (from Brazil). 



3. Hind wing of JL'tnianax epldppigcr Burmeister. 



Plate XXXVII. 



Fig. 1. Wings of GomphxschnafurciUata, Say. 



2. Wings of Hasixsclina Janata Say. 



3. Wings of Boyeria Irene Fonscombe. 



Plate XXXVIII. 



Fig. 1. Wings of lloplonasclma armata Hagen. 



2. Wings of Brachytron pratense Miiller. 



3. Wings of .Eschnopldebia anisoptera Selys. 



Plate XXXIX. 



Fig. 1. ^Xings oi NasUvschnnpentacantha Rsimhur. 



2. Wings of Staurophlehia reticulata Burmeister. 



3. Wings of Gynacantha trifida Rambur. 



