The Ohio V\[^atuTalist, 



PUBLISHED BY 



The Biological Club of the' Ohio State Uni'versity. 

 Volume VII. JUNE, 1907. No. 8. 



TABLE OF CONTENTS. 



Jackson, Mrs.— Synopsis of the .A.merii.'an Species of the Genus Papirius 159 



McCi.ee'ry— Ohio Plants with Punctate Glands and Glandular Scales and Pubescence, 178 



Stauffer — The Devonian Limestones of Ceutral 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. 



Xearly all of the above difficulties must be overcome by a 

 student of the Thysanura. This is especially true of very minute 

 fragile forms, as the AphorMvidae. While the number of speci- 

 mens of Collembola collected in one day may be considerable, yet 

 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 



