32 THE IMMATUEE STATE OF THE ODONATA. 



agrees more in general appearance than with ^Eschnina. The three-jointed 

 tarsi and slender antenna; are like Cordulegaster, from which, however, it 

 is excluded by the diflerent shape of mask, which again refers it to 

 ^schnina. 



A nearer determination is now not possible. 



24. -ffiSCHNA (?) SPECIES. 



Plate HI. Fig. 3. 



Male nympha, dried. Length, 37 mm. ; breadth, 13 mm. Locality, La 

 Guayra, Venezuela. 



Stout, short, broad, somewhat depressed, in general looking like some 

 forms of Gomphus. Head, body, and legs covered with cylindrical or pyr- 

 amidal spines, dark at the base and light-yellow at upper portion, which has 

 a slight depression, in which there may be an orifice. The spines point 

 backward, and vary in size. Head large ; breadth, twice length. Eyes 

 prominent, prolonged at the inner angle into a triangular lobe, which in the 

 specimen is wrinkled so as to have appearance of vanes of a feather. Sit- 

 uated in front of this is a polished ridge lighter in color. Upper lip very 

 large. Vertex rather wide and slightly convex ; posterior portion showing 

 indications of ocelli. Antennaa rather short, five-jointed ; two basal joints 

 globular ; third as long as both basals, cylindrical ; fourth shorter than fifth, 

 which is also shorter than third and pointed. It is possible there may be 

 two more rudimentary joints; but from the single specimen, which has only 

 one of the antenna", it is impossible to decide. Occiput rather deeply notched, 

 sides oblique, hind angles rounded. Just back of eyes is a small conical 

 projection near each side. Mask small in proportion, extending between 

 middle legs, narrow and gradually enlarged ; middle third of foreborder 

 somewhat produced, and cleft sarinounted by comb of light hairs, and with 

 a small tooth on each side of cleft. Palpus nearly if not quite smooth. 

 Movable hooks, slender, and bent near tip. Prothorax as broad as occiput ; 

 cut rather square at sides, and projected in rather sharp angle at forward 

 part. Stigmata entirely covered. Thorax rather long in proportion. Legs 

 strong, formed for running ; fore and middle legs of nearly equal length ; hind 

 legs longer, reaching ninth segment. The femora of all the legs are stouter 

 and shorter than the tibiie, and have a notched hook on the upper edge; tarsi 

 three-jointed. Proces.ses above fore legs of equal length ; posterior one tri- 

 angular, sharp ; anterior large, square, notched at tip. Abdomen stout, 



