164 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



Order I.— ANAMORPHA. 



This order, although the Germatobiidce tend to form a connecting 

 link, may be divided into two suborders : 



a. Spiracles in two series, lateral, with strong chitinous walls; eyes not trtfly fac- 

 eted ; coxae of prehensorial legs j oined and armed with teeth ; maxillary palpus 

 3-jointed, armed with a claw, j oints without spines; dorsal plates distinctly 

 15 ; antennae not multiarticulate ; tarsi not or a few of the last multiarticu- 

 late ; claw of female genitalia with basal spines Unguipalpi. 



aa. Spiracles in one series, 6, dorsal, without strong chitinous walls ; eyes faceted ; 

 coxse of prehensorial legs not distinctly coalesced, armed with long spines ; 

 maxillary palpus 4-jointed, unarmed, joints with long spines; dorsal plates 8, 

 rest reduced to mere rudiments ; antennae and legs multiarticulate ; claw of 

 female genitalia without basal spines Schizotarsia. 



Suborder I.— UN. UIPALPI. 



Analysis of families. 



a. Tarsi of all legs triaticulate ; spiracles strictly lateral Lithobiid^e. — I. 



aa. Tarsi uot all t Particulate; spiracles somewhat dorsal Cermatobiidce. — II. 



Family I.— LITHOBIID.E. 



Analysis of genera. 



a. Labrum uuidentate; a single large ocellus on each side of head; legs unarmed. 



Henicops Newport. 

 aa. Labrum tridentate ; ocelli absent or more than one ; legs armed with spines. 



Lithobius* Leach. 



Family II.— CERMATOBIIDCE. 



Contains the East Indian genus Germatobius Haase. 



Suborder II. -SCHIZOTARSIA Brandt. 



Includes the following family : 



Family III.— SCCTTIGERnXEJ. 



Includes the cosmopolitan genus Scutigera Lamarck. 



Order II.— EPIMORPHA Meinert. 



Analysis of families. 

 a. Pairs of legs 21 or 23; antennas more than 14-jointed; pairs of spiracles 9, 10, or 



19 ; anal pleurae large, scutelliform Scolopendrid^e. — IV. 



aa. Pairs of legs never less than 30; antennas 14-jointed; pairs of spiracles two less 



than pairs of legs ; anal pleurae coxiform _ Geophilid^e. — V. 



* Analysis of subgenera of Lithobius. 



a. Posterior angles of none of the dorsal plate produced Archilithobius. 



aa. Posterior angles of the 11 and 13 dorsal plates produced Hemilithobius. 



aaa. Posterior angles of the 9, 11, and 13 dorsal plates produced. 



b. Coxae of last four legs with pores . Lithobius. 



bb. Coxae of last five legs with pores Pseudolithobius. 



a-aaa. Posterior angles of the 7, 9, 11, and 13 dorsal plates produced.. Neolithobius. 

 aaaaa. Posterior angles of the 6, 1, 9, 11, and 13 dorsal plates produced. 



Euhthobius. 



