PROBABLE FUNCTION OF OCELLI. 181 



ing to Scudder, one exception, namely, the genus 

 Pamphila. 



On the whole, then, perhaps the most probable view 

 is that, as regards insects, the ocelli are useful in dark 

 places and for near vision.* 



Whatever the special function of ocelli may be, it 

 seems clear that they must see in the same manner as 

 our eyes do — that is to say, the image must be reversed. 

 On the other hand, in the case of compound eyes, it 

 seems probable that the vision is direct, and the diffi- 

 culty of accounting for the existence in the same animal 

 of two such different kinds of eyes is certainly enhanced 

 by the fact that, as it would seem, the image given by 

 the medial eyes is reversed, while that of the lateral 

 ones is direct. 



* Forel, in his last memoir, inclines to this opinion. 



