OF THE 



NEW YORK ACADEMY OF SCIENCES, 



VOLUME IX. 



I. — The Graspedosomatidse of North America. 



BY O. F. COOK AND G. N. COLLINS. 

 Read October 7, 1895. 



Inteoductoey Note on the Families of Diplopoda.* 



Since the completion of the paper on North American Graspe- 

 dosomatidse many dissections and drawings of representatives of 

 other families of Diplopoda have been made, resulting in the ap- 

 prehension of more light on the affinities of the group here treated. 

 Among the forms studied are Striana, Stemmatoiulus, Cambala, 

 Cambalopsis, Nannolene, Pseudonannolene, Lysiopetalum, Psero- 

 mopus, Siphonophora, Siphonoius, Siphonorhinus, Spirostreptus, 

 Spirobolus, Paraiulus, Pseudoiulus, and numerous representatives 

 of the Polydesmoidea. The result of this examination is opposed 

 to the opinion of Pocock, Latzel and Berlese, that the present 

 family is allied most closely to the lulidae. It seems more reason- 

 able to place the Graspedosomatidse next to the Polydesmida^ and 

 to arrange the families of Diplopoda as follows : 



Glass DIPLOPODA. 



Sulsclass PSELAPHOGNATHA. 

 Order Ancyrotricha. 

 Family Polyxenid^, — genera Polyxenus and Loplioproctus. 

 Distribution : Cosmopolitan. 



*ByO. F.Cook. 



Annals N. Y. Acad. Sci., IX, Oct., 1895.— 1 



