AND STRUCTURE IN^ THE SEXES 103 



Ml 



ous forms (fig. 26) ; in others the front shin or tibia 

 is formed like a concave shield or shell (fig. 25), and 

 all the j oints of that leg more or less distorted ; in 

 another male (a rather doubtful native which has 

 not been taken in this country for fifty years) 

 the head is narrowed behind into an almost 

 ridiculously small neck, being quite triangular 

 in form, viewed from above, with the eyes pro- 



I 2 



FIG. 25. FIG. 26. FIG. 27. 



jecting from its anterior angles (fig. 27, i), the 

 female head being of normal form (fig. 27, 2). 



In the males of several species of fossors 

 and bees the eyes are enormously developed, 

 joining one another on the top of the head. 

 This condition occurs also in the drone of the 

 hive bee. The male of Astatus, which has this 

 character, has also a peculiar habit. It sits 

 basking in the sun on some bare sandy spot, 

 and when disturbed makes a sort of circular 

 detour and pitches down again exactly on 

 the spot from which it started up. An in- 



