XVI] THE GEOLOGICAL RECORD 311 



the wing-margin. The result is to broaden the hind-wing basally. 

 Even so, the wing is only of moderate width when its great 

 length is taken into account. 



In the Stenophlebiinae we meet with another group of large 

 Dragonflies, ranging from five to seven inches in expanse, and having 

 excessively slender wings. The quadrilateral in this group had 

 a sharply acute distal angle. A short cross-vein divided it into 

 a weak triangle and super-triangle. The radius, however, was 

 unbranched, and in other respects these insects exhibited distinct 

 Calopterygid structure. 



Three species of Tarsophlebia give us a close connection with 

 the Lias. 



Zygoptera belonging to recent subfamilies are for the first 

 time represented, by two genera of Epallaginae, Euphaeopsis and 

 Pseudoeuphaea. The former (fig. 162) had the costal margin 



Fig. 162. Part of hind-wing of Euphaeopsis multinervis Hagen 

 ( x 2), Upper Jurassic, Solenhofen. q quadrilateral. After Hagen. 



raised near the base into an obtuse-angled swelling, recalling the 

 similar formation in Cora. The genus Steleopteron appears to 

 have had Lestine affinities; but the nodus was weakly formed, 

 and there were five antenodals. 



In the Anisoptera, we find a considerable assemblage of forms 

 which can be placed definitely in the Gomphinae, Cordulegastrinat 

 and Petalurinae. The triangular region of Mesuropetala koehleri 

 Hagen closely resembles that of Petalura. Except for greater 

 density of venation, Cymatophlebia comes very close to Cordulegaster. 

 The Gomphinae are represented by Nannogomphus, while Protolin- 

 denia seems only doubtfully referable to the same subfamily. 

 The most interesting of all the Anisoptera represented at Solenhofen 

 are undoubtedly the Aeschnidiinae, characterized by the density 

 of their wing-reticulation, and by having the triangles elongated 

 transversely to the wing-axis in both wings. Of these, the best 



