No. 2.] 



SCUDDER — INSECTS FROM CAPE BRETON. 



89 



The abdomen of the specimen (fig 1) is nearly perfect, and 

 presents a ventral aspect, portions of the flanks of the body may 

 Fig. l. Fig. 2. 



he seen on either side ; upon the left side in direct continuity 

 with the ventral segments and very distinctly, especially since 

 this region is darker colored than the other parts of the abdomen. 

 The limitation between the ventral and pleural portions is 

 sharply defined on this side by slight ridges, showing that in life 

 these parts were abruptly limited, while the margination of the 

 -extreme border of the fossil shows that, as in living odonate 

 larvae, the dorsal was again separated from the pleural region of 

 the abdomen by a distinct bend. The abdomen is elongate- 

 ovate, devoid of any armature, composed of nine segments, the 

 ninth obscure and bearing a pair at least of rounded lobate pads 

 of considerable size, but not as in recent Odonata, pointed at the 

 tip, The second to the fifth segments are shorter than the 

 others ; the posterior edge of all the segments is straight, except- 

 ing that of the seventh, that is gently convex, and that of 

 the eighth, which is strongly and roundly excised ; that of 

 the ninth appears also to be regularly concave. The entire 

 entire length of the abdomen is 13.5 mm , and the width of the 

 fifth or broadest segment 6.5 tum , counting only the ventral por- 

 tion ; the appendages are l mm long. - 



It is impossible to say to which group of Odonata the fossil 

 belongs. The Agrionina, are, however, unquestionably to be 

 excluded. It seems to be most probably one of the Libellulina, 

 and may be provisionally placed in the old genus Libellula 

 (which formerly contained all the Odonata) and bear the name 

 Libellula carbonaria. 



Accompanying this interesting fossil is a frond of Alethopteris 

 and two fragments of wings of cockroaches One of the latter is 

 too insignificant to be worth noticing, but the other is sufficient 

 for determination, and may be called Blattina sepulta (fig. 2). 



