THE PALEONTOLOGICAL DATA 



103 



The last of the series of American fossil insect remains from the Lower 

 Upper Carboniferous is Eurythmopieryx antiqiia (Fig. 102). In this wing 



definite cross-veins had been ^ , 



attained; and media is of the 

 isolated front branch type, which 

 will be discussed a little later. 



The single representative of 

 the Lower Upper Carboniferous 

 insects found in the British 

 Islands is Pseudofouquea cam- 

 hrensis (Fig. 103). In this media 

 is clearly dichotomously branched, 

 with an accessory vein on vein M4. 



There remains only a single 

 Lower Upper Carboniferous insect 



to be mentioned. This is the German Stygne Rocmeri (Fig. 104). In this 

 species media was of the isolated front branch type. 



I will now state my reason for beUeving that this isolated front branch 

 of media is vein Mi +2. The determination of the origin of this type of 



Fig. loi. 



-Bathylaplus falcipennis (After 

 Handlirsch). 



Fig. 102. — Eurylhmopteryx antiqua (After Handlirsch). 



media was an exceedingly puzzling problem. It was made more so by the 

 existence of many genera in which this vein resembles the typical form of 



radius, that is with a simple 

 front branch and a four- 

 branched sector (Fig. 95)- 

 This led me to think for a 

 time that the four-branched 

 sector represented the four- 

 branched media of theh^TDO- 

 thetical type of Comstock 

 and Needham and that the 



Fig. 



103. — Pseudofouquea cambrensis (After 

 Handlirsch). 



isolated front branch was a vein that had been lost in the course of the 

 evolution of more recent insects. 



