232 SYNOPSIS OF NORTH AMERICAN MYRIATODA. 



SYNOPSIS OF NORTH AMERICAN MYRIAPODA. 



Class Myriapoda. 

 Ord. chilopoda. 



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



Sub Ord. SCHIZOTARSIA. 

 Tarsi composed of a very great number of small joints. 



Fam. CERMATIID.E. 



Gen. Cermatia. 

 G. forceps. 



Sub Ord. HOLOTARSIA. 

 Tarsi composed of but few joints. 



Fam. LITHOBIID.E. 



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



Gen. Lithobius. 



Excavations on the posterior coxa? large, ovate, arranged in a single scries upon a 

 depressed face. 



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

 L. planus.^ Scuta rugose. Labial denticules about 14. 

 L. paucide?i8. Labial denticules about 4. 



Gen. Bothropolys. 



Excavations on the posterior coxa 1 small, almost round ; arranged in a three or four- 

 fold series on a scarcely depressed face. 



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



B. Xanti. Ocelli on each side IS. Surface of the scuta verj roughly rugose. 



II. bipunctaius. Ocelli on each side Is. Surface of the scuta but slightly roughened, 



| Species marked with a cross have never been identified bj the author. 



