144 THE V/INGS OF THE ISOPTERA 



The anal area. — In all living teraiites known the anal area of the fore 

 wings is reduced to a small space at the base of the wing in which there are 

 no distinct anal veins. 



In the hind wings of Mastotermes the anal area is not reduced, in fact a 

 specialization by addition appears to have taken place ; the three anal veins 

 are present, and the second and third anal veins are much branched. In 

 the hind wings of Termopsis a marked reduction of the anal area has taken 

 place, but it is still more prominent than that of the fore wings; the first 

 and third anal veins are lost, and the second anal vein is greatly reduced. 

 In the hind wings of Leucotermes the anal area is reduced to the condition 

 of this area in the fore wings of all living termites. 



