14 ODONATA. 



16. Cordulegaster annulatus. 



Selys, Monogr. di-s Gomph., p. 333, No. 110. 



Plate III., fig. 3. 



Nympha, female, not full grown. Coll. Hagen. Locality, Liineburg, 

 Hannover ; Mr. Heyer. Length, 30 mm. 



Not to be distinguished from C. Sat/i, but distinguished from C. biden- 

 iatus by having lateral spines on 8th and 9th segments, and by the 

 length of superior anal appendix, which is, as in C. Sayi, of nearly 

 equal length with lateral appendices. As the only species of Cordule- 

 gaster known in Europe are C. bidentatus and C annulatus, this nympha 

 is referred to the latter ; C. bidentatus has not been found in the North 

 of Germany. 



17. Cordulegaster bidentatus. 



Selys, Monogr. des Gomph., p. 339, No. 112. 



Plate III., fig. 1, a, b, c, d. 



Nympha, female. Raised by Dr. Brauer. Locality, Vienna, Austria. 

 Coll. Hagen. Length, 43 mm. 



In most respects strikingly like C. Sayi ; differs in having the sides 

 of the head more straight, and less gradually sloped backward, making 

 hind- border broader than C. Sat/i ; in having no lateral spines, and in 

 the inferior length of superior anal appendix, which is one half the 

 length of lateral appendices and blunt. 



The figured specimen is described at some length by Dr. Hagen, in 

 the Stettin Entom. Zeit., XIV. p. 265, and by Dr. Brauer, New. Austr., 

 p. xv. 



