JUN 141907 
The Ohio Naturalist, 
PUBLISHED BY 
The Biological Club of the Ohio State University. 
Volume VII. JUNE, 1907. No. 8. 
TABLE OF CONTENTS. 
Jackson. Mrs. —Synopsis of the American Species of the Genus Papirius. 159 
McC'leery— Ohio Plants with Punctate Glantls and Glandular Scales and Pubescence. 178 
Stauffer— The Devonian Limestones of Central Ohio and Southern Indiana. 184 
Ely —Succulent Plants of Ohio. 186 
Earl —Evergreen Plants of Ohio. 188 
Frank— Meeting of the Biological Club. . 190 
SYNOPSIS OF THE AMERICAN SPECIES OF THE GENUS 
PAPIRIUS. 
Alma Drayer Jackson. 
Introduction'. 
Every student of Entomology in pursuing his favorite sub¬ 
ject is bound to find certain difficulties to be overcome. Some 
insects have very fragile bodies, while others have minute hairs 
and spines which are of value for classification, and must there¬ 
fore be protected. Still other insects may be very hard to locate 
or capture without injury. 
Nearly all of the above difficulties must be overcome by a 
student of the Thvsanura. This is especially true of very minute 
fragile forms, as the Aphoruridae. While the number of speci¬ 
mens of Collembola collected in one day may be considerable, vet 
the greater majority will be found to belong to one or two species 
of the genus Tomocerus , which are very common everywhere. 
To secure the more rare forms requires long and careful search¬ 
ing, especially the genera which have such admirable color pro¬ 
tection as we find in the genus Papirius. 
This genus contains one or two rather widely distributed 
species which are quite common in places, but the remainder of 
the species described for America are extremely rare or 
limited in their range, at least we find but a small amount of 
literature on the species of this genus. One explanation of this 
is in the fact that many of the original descriptions are so brief 
that it would be almost impossible to identify specimens from 
them, even if the literature were accessible, which is frequently 
not the case. 
It is to partially obviate this last difficulty that the present 
paper has been compiled, giving a brief synopsis of all known 
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