232 



SYNOPSIS OF NORTH AMERICAN MYIUAI'OHA. 



SYNOPSIS 0¥ NORTH AMERICAN MYKIAPODA. 



Class MyriaytocLa. 



Orb. CIIILOPODA. 



Segments of the body provided with a single pair of feet. 



Sub Orb; SCHIZOTARSIA. 



Tarsi composed of a very great number of small joints. 



Fam. CERMATIID^E. 

 Gen. Cermatia. 

 G. forceps. 



Sub Ord. BOLOTAR8IA. 

 Tarsi composed of but few joints. 



Fam. UTHOBIIDJE. 



Dorsal scuta 15, two sets ; a smaller scutum alternating with a lareer 



Gen. Lithobius. 



Excavations on the posterior coxae large, ovate, arranged in a single series upon a 

 depressed face. 



L. Americanus. Scuta smooth, not rugose. Labial denticules about 10. 

 L. planus. -\ Scuta rugose. Labial denticules about 14. 

 L. paitcidens. Labial denticules about 4. 



Gen. Bothropolys. 



Excavations on the posterior coxa: small, almost round ; arranged in a three or four- 

 fold series on a scarcely depressed face. 



B. multidentatus. Ocelli on each side from 32 — 37. 



B. Xanti. Ocelli on each side 18. Surface of the scuta very roughly rugose. 



B. bipwnctatus. Ocelli on each side 18. Surface of the scuta but slightly roughened. 



f Species marked with a cross hare never been identified by the author. 



