THE COMPOUND EYES OF MACHILIS. 



FRANCES S EATON. 



This study was made from the eyes of Machilis variabilis* 

 This insect is found in great numbers on the under surface 

 of stones which lie near the water's edge at the bottom of Fall 

 Creek gorge, Ithaca, X. V. 



During the last of June, when the first trips for collecting 

 these insects were made, they were found to be of two different 

 sizes ; but in August only a few of the small ones were met with. 



Whether this difference in size corresponds to a difference in sex, 

 or whether the larger ones were some that were hatched during 



tained. 



In June and July, the exuviae were abundant on the stones, 

 but in August so few of these were found that it would seem as 

 if these insects must reach tl 1 It t e during the latter part 

 of the summer. At this time also, the largest insects measured 



Early morning proved the best time for collecting Machilis. 



