nik i mm \ ii re ST \ n; 01 i in. "ixi\ \ i \ 23 



LEGIO CORDULIA S,, vs. 



These nymphaa have the anterior pari of the head flat, never developed in 



a p\ familial horn as in Macromia ; and the legs are much shorter. 



The large genus Cordulia is divided into nine genera, of which t lie 

 nymphaa of only two, Cordulia and Epitheca, are known. These arc the 

 mosl nearly related to each other of the nine genera. The general descrip- 

 tion of Macromia has been purposely given in a very detailed manner; 

 therefore it would be useless to repeat here those details. In fact, Cordulia 

 as Car as known is very homogeneous, and it may be stated that the body 

 is decidedly larger and more bulky, and the legs stronger and shorter. 



The genus Epitheca differs from Cordulia (proper) in the tendency, in 

 some species, of the anterior part of the forehead to be somewhat thickened. 

 a slight homology to the horn of Macromia. and in the presence of two 

 erect spines behind the eyes. The body is shorter and flatter, the dorsal 

 hooks of the abdomen strongly developed ; the lateral spines longer and 

 stronger. The genus Cordulia is comparatively spineless, has the body 

 longer and more cylindrical, the dorsal hooks absent or less developed, the 

 lateral spines short and insignificant. 



It is impossible to say more till more nymphaa are known. 



10. EPITHECA BIMACULATA. (Raised.) 



Plate III. Fig. 2. 



Charpentier. Selys, Revue, p. 66. 

 Nympha. Frisch, Insecti, VIII. p. 20, pi. 9. Hagen, Stett. E. Zeit., XIV. p. 263. 3. 

 Brauer, Neur. Austr., p. xv. 



Length, 31 mm.; breadth, 11 mm. 



Seven nympha skins from Wilkie, near Kb'nigsberg, East Prussia. .Tune 

 4, 1845, secured in transformation by H. Hagen ; a much larger num- 

 ber compared. Body large, elongated, naked head about half as broad 

 as abdomen ; a little longer than half its breadth : eyes nearly in middle 

 of sides, which slope before and behind, conical, prominent, rounded on 

 top, an angular prolongation behind ; occiput brown with pale ill-defined 

 band from the eyes to hind angles ; a number of small black tubercles 



