The Ohio Naturalist; 



PUBLISHED BY , 



The Biological Club of the Ohio State Uni'versity, 



Volume IX. JUNE, 1909. No. 8. 



TABLE OF Contents. 



Jackson, Mrs.— A Study of Ohio Forms of the Genus Lepidocyrtuis'. 525 



Hyde — The Reduction Division in the Anthers pf Hyacinth us; Orientalis .... . . 539 



McCR.iY— Meeting of the Biological Clulj. ..... : ;.......".'.......... ." 544 



A STUDY OF OHIO FORMS OF THE GENUS LEPIDOCYRTUS.* 



' ft 



Alma Drayer Jackson. • 



The following paper gives the results of a study of the Ohio 

 forms of the genus Lepidocyrtus, including notes on the classifi- 

 cation, a discussion of the geographical distribution, and obser- 

 vations on the life history. 



My studies were carried on at the Ohio State University 

 under the direction of Professor Herbert Osborn, whose kind 

 assistance has been greatly appreciated. Thanks should also be 

 given to Professor J. W. Folsom who has read and criticised the 

 paper. 



A review of the literature on the family Entomobryidae has 

 shown but little work done on the genus Lepidocyrtus except in 

 the description of species. For this reason a special study of 

 the Ohio species has been attempted with the hope of being able 

 to add some notes of interest on the life history. 



The habits of Lepidocyrtus are much the same as for other 

 Collembola generally frequenting damp situations. A favorite 

 locality seems to be underneath the bark of old trees, or among 

 dead leaves and under stones. An exception to this is found in 

 the case of L. cephalopurpureus Harvey, which was found in 

 stored celery. Lepidocyrtus may be taken throughout the year, 

 in winter being found deep beneath the fallen leaves. As a rule 

 they are very active, and are found living either solitary or in 

 colonies. Our North American species range in size from 0.6 to 

 1.5 mm. in length. 



* Contributions from the Department of Zoology and Entomology of 

 the Ohio State University, No. 31. 



525 



