308 



THE GEOLOGICAL RECORD 



[CH. 



polygonal cells. Hence they probably soon died out, from weakness 

 of flight, and left no direct descendants. 



The Tarsophlebiinae (fig. 158) had an incomplete arculus. 

 Consequently the quadrilateral was open basally, as is the case 

 in the hind-wing of the living Hemiphlebia (fig. 22). They were 

 undoubtedly Calopterygidae, and were chiefly remarkable for their 

 very long slender legs, with elongated four- jointed tarsi. Probably 

 they used their legs for both walking and climbing. 



R; 



M' 



RtM 

 :;Cu 

 "A 



Fig. 157. Basal portion of wing of 

 Archithemis brodiei Geinitz ( x 2-6), 

 Lias, Dobbertin. After Handlirsch. 



Fig. 158. Portions of leg and wing of 

 Tarsophlebia westwoodi Giebel ( x 1), 

 Lias, Cheltenham, q quadrilateral; 

 ij-t 4 , the four joints of the tarsus; 

 tib tibia. After Hagen. 



Fig. 159. Wings of Heterophlebia dislocata Brodie and Westwood 

 ( x 2), Lias, Cheltenham. After Westwood. 



The Heterophlebiinae (fig. 159) were fairly closely related to- 

 the living Epiophlebia of Japan. The fore-wing quadrilateral 

 resembled that of the latter genus, but was considerably wider. 

 The hind-wing had a peculiarly stretched and distorted quadri- 

 lateral, with a horizontal cross-vein separating off a lower triangular 

 portion. This formation was essentially unstable, since the upper 

 side of the "triangle" was not continued by any main vein, as it 



