23. Segments thirty to thirty-five; color yellowish, with a dark mid-dorsal 



band 



Brachyinlus Berlese 

 (Julus Linn, (part) ) 

 Segments thirty-five to sixty; color brownish to whitish or light mottled; 

 with a dark band between the eyes 24. 



24. With thirty-five to forty-two segments 



Diplondus Berlese 



(Julus Linn, (part) ) 



With forty-nine to sixty segments 



Ophyiulus Berlese 



(Julus Linn, (part) ) 



KEY TO THE COMMON GENERA OF CHILOPODA 

 OR CENTIPEDES 



1. With fifteen pairs of legs 2. 

 With twenty-one or more pairs of legs in the adult IL 



2. With eight dorsal plates; legs very long 



Scutigeromorpha, ScuUgera Lamarck 

 With fifteen leg-bearing segments; legs short Lithohiomorpha (or Litho' 

 hiidae) 3. 



3. With one ocellus or with none 



Lamyctes Meinert 

 (Hemcops Newport) 

 Eyes with many ocelli 4. 



4. Coxal pores numerous, in three to five series; mostly west of the Rockies 



Bothropolys Wood 

 (Eulithohius Stuxberg) 

 Coxal pores not in several series 5. 



5. No articular spines on legs; southeastern states 



Watohius Chamberlin 

 Legs with articular spines 6. 



6. Spines of one gonopod (foot of male modified for copulation) at an angle 



with the spines of the other, when viewed from the rear; southern 



states 7. 



Spines of both gonopods of a pair in the same horizontal plane; more gen' 



erally distributed 8. 



7. Antennae twenty-segmented 



Arenohius Chamberlin 

 Antennae with more than twenty segments 

 Gosihius Chamberlin 



8. Angles of dorsal plates not produced posteriorly 



ArchiUthohius Stuxberg 

 Posterior angles of a few dorsal plates produced 9. 



9. Posterior angles of four dorsal plates produced (7, 9, 11 ^ 13) 



J\leolithohius Stuxberg 

 Posterior angles of two or three dorsal plates produced 10. 



220 



