94 



Psyche 



[June 



the single ocellus usually is. The two are entirely distinct, each 

 being set in a slight depression with the intervening distance 

 greater than the diameter of each ocellus. The lateral ocelli, one 

 at the inner upper margin of each compound eye are both present 

 and both normal. Unfortunately, due to lack in depth of focus 

 of the lens used, these do not show in the photograph. 



Believing it would be interesting to know the nature of the ocel- 

 lar nerve and its relation to the brain, the head was removed and 



Fig. 1. Fare view of MelanopLus fcmur-ruhrum showing 

 the supernumerary median ocellus. 



placed in weakened solution of eau de Laharaque for twenty-four 

 hours to soften the chitin. It was then dehydrated and embedded 

 in paraffin in the usual way and serial sagittal sections ten 

 micra thick were prepared. These sections were used as a basis 

 for a reconstruction of the ocelli and ocellar nerve. 



In the normal grasshopper as was shown many years ago by 

 the beautiful dissections and drawings of Burgess," the nerve to 

 the median ocellus in M. femur-rubrum arises independently as 



'Burgess, E. In the article "The brain of the Locust' 

 U. S. Entom. Com. 1880. 



by A. S. Packard. 2d rept. 



