THE GORDIACEA OF CERTAIN AMERICAN 

 COLLECTIONS, WITH PARTICULAR REF- 

 ERENCE TO THE NORTH AMERICAN 



FAUNA.— II. 



BY THOMAS H. MONTGOMERY, JR., PH. D., 



Lecturer in Zoology, University of Pennsylvania. 



Plates XIX and XX. 



The present paper deals with Gordiacea, principally of 

 California, and with a few specimens from neighboring 

 regions (Baja California, Arizona, Nevada, and Mexico). 

 The fauna of California has been heretofore but little 

 known, so that the comparatively large number of speci- 

 mens from that locality which have been offered to me for 

 study have a special interest. In a previous contribution ' 

 Gordiacea were described by me from other portions of 

 North America. 



The following collections are herein described: that of 

 the California Academy of Sciences, San Francisco; of 

 the University of California; and of Stanford Uni- 

 versity, California. For the opportunity to study these col- 

 lections, my thanks are due to Dr. Gustav Eisen of the 

 California Academy of Sciences, and to Prof. Henry B. 

 Ward of the University of Nebraska. 



Appended to this paper is a Key for the determination of 

 the species of Gordiacea on the North American continent, 

 north of Mexico. While this key may serve to determine 

 with rapidity certain species, it must be noted that some of 

 them, and particularly the females of Gordius and Chor- 

 dodes, can only be satisfactorily determined by means of 

 sections and of portions of the cuticle cleared in glycerine 

 or some clearing oil (I am accustomed to clear them in 

 cedar oil, after dehydration, and to study them mounted in 

 Canada balsam). For descriptions of species which are 



1 Bull. Mus. Compar. Zool., Harvard University, April, 1898. 



L333] Oct. 1, 1898. 



