IOWA ACADEMY OF SCIENCES 
24S 
EXPLANATION OP PLATE. 
Figure 1. 
Dorsal view 
of head 
of Isotoma leonina Packard. 
2. 
Lateral ” 
” ” sensihilis Tullberg. 
3. 
Dorsal ” 
” Sminthurus aureus Lubbock. 
4. 
Lateral ” 
7 > 
77 7 ? 77 77 
5. 
Dorsal view 
of right 
eyespot of Isotoma muskegis Guthrie. 
t). 
” ” Orchesella alhosa Guthrie. 
7. 
” 
” ” Tomocerus niger Bourlet. 
8. 
” ’• 
” Sminthurus aureus Lubbock, 
9. 
” ” Papirius maculosus Schott. 
10. 
” ” 
” ” 
” ” Lepidocyrtus purpureus 
Lubbock. 
11. 
Dorsal ” 
77 77 
” ” ” 10-oculatus Guth. 
12. 
” ” 
77 
” ” ” Q-ocuJatus Guth. 
13. 
Lateral view 
of head 
of Isotoma A-oculata Tullberg. 
The ocellar S referred to in the text is indicated by the dark stripe 
connecting the ocelli. 
In figures 7, 11 and 12 the X situated on the course of the ocellar S 
denotes the position from which the ocellus indicated in each case is 
supposed to have disappeared by atrophy. 
