Katharine Foot and Ella Church Strobell 337 



probably, as stated above, to some unusual condition in the drying- on 

 the slide, for it occurs only in definite areas. Mag. 660. The head of the 

 sperm is slightly out of focus, for it was necessary to sacrifice this detail, 

 to get an exact focus on the extremely fine fibrillae of the tail. 



This preparation resembles many of the figures Ballowitz gives of the 

 spermatozoa of Coleoptera (1). 



