680 MEDICAL ENTOMOLOGY 



SAMSON, K. Zur Anatomic und Biologic von Ixodes ricinus, L, 



Zeitschr. f. wiss. Zool. Band xciii, 1909. Deals 

 very fully with anatomy and histology of Ixodes 

 ricinus ; a most valuable paper. Zur Spermohis- 

 tiogenese der Zecken. Sitzungsbr. d. Gesellsch. 

 naturf. Freunde, No. 8, 1909. Contains a detailed 

 account of the spermatozoa in Ixodes ricinus and 

 Ornithodonis moubata. 



STILES, C. W. The taxonomic value of the microscopic structure of 



the stigmal plates in the tick genus Dermacentor, 

 Treasury Department, Public, Health and Marine 

 Hospital. Service of the United States, Hygienic 

 Laboratory, Bulletin, No. 62, Washington, D.C. An 

 important paper in which the structure of the stigmal 

 plate is used in separating species. 



