The Ohio V^aturalist, 



PUBLISHED BY 



The Biological Club of the Ohio State Uni'versity, 

 Volume VI. DECEMBER, 1905. No. 2 



TABLE OF CONTENTS 



Ortmann — A New Species of Cambarus from Louisiana 401 



Gleason— Notes from the Ohio State Herbarium. V 403 



Berger— Habits and Distribution of the Pseudoscorpionidae, Principally Chelanops 



oblongus, Say 407 



SCHAFFNER — Key to the Ohio Dogwoods in the Winter Condition 419 



ScHAFFNER, Mabel— Free-floating Plants of Ohio 420 



Surface — Meeting of the Biological C'lub 422 



A NEW SPECIES OF CAMBARUS FROM LOUISIANA. 



Dr. a. E. Ortmann, 

 Carnegie Museum, Pittsburgh, Pa. 



The types and cotypes of the new species described herein 

 were collected by Professor Jas. S. Hine on July 12, 1905, in a 

 small freshwater pool, J^ mile from Gulf Beach, near Cameron, 

 Cameron Parish, Louisiana. There are 2 males of the first form, 

 and 4 females. They were found associated with a number of 

 large and small individuals of Cambarus {Cambarus) clarki Gir. 



Cambarus (Cambarus) hinei spec. nov. 

 (See Fig. 1). 



Description of male of the first form. 



Rostrum triangular, about twice as long as broad on the 

 basis; margins very slightly convex, almost straight, rather 

 evenly converging to the acute tip, with a very slight indication 

 of lateral angles at the base of the short acumen. No marginal 

 spines. Upper face of rostrum flat at the base, slightly concave 

 toward the tip; margins slightly elevated. Postorbital ridges 

 short, divergent posteriorly, sharp at anterior end, but without 

 distinct spine. Carapace ovate, slightly compressed, punctate. 

 Infraorbital angle blunt. Branchiostegal spine small. Cervical 

 groove sinuate. No lateral spines on carapace. Areola as long 

 as or slightly shorter than half of the anterior section of carapace, 

 very wide, with 4 or 5 irregular rows of punctations. 



Abdomen as wide as, and longer than carapace. Anterior 

 section of telson with two spines on each side, posterior section 

 rounded. 



