164 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



Order I. ANAMORPHA. 



This order, although the CermatoMidw tend to form a connecting 

 link, may be divided into two suborders : 



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

 eted; COX;B of prehensorial legs joined and armed with teeth; maxillary palpus 

 3-jointed, armed with a claw, .joints without spines; dorsal plates distinctly 

 15; antennas not multiarticnlate ; 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; 

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

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

 rest reduced to mere rudiments; antenna} 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.K. I. 



aa. Tarsi not all triarticulate ; spiracles somewhat dorsal CERMATOBIHXE. II. 



Family I. LITHOBIIDJ<:. 



Aiutlysix of genera. 



a. Labrum nuidentate; a single large ocellus 011 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. CERMATOBIID^E. 



Contains the East Indian genus Germatobius Haase. 



Suborder II. -SCHIZOTARSIA Brandt. 

 Includes the following family : 



Family III. SCUTIGERIDJE. 

 Includes the cosmopolitan genus Scutigera Lamarck. 



Order II. EPIMORPHA Meinert. 



Analysis of families. 



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

 19 ; anal pleura} large, scutelliforin SCOLOPKNDRIDJE. IV. 



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

 than pairs of legs; anal pleura 1 coxiforin GEOPHILID.T-:. V. 



.lixdysis of subyenera of Lithobiu*. 



a. Posterior angles of none of the dorsal plate produced ARCUILITI-IOBIUS. 



ait. Posterior angles of the 11 and 13 dorsal plates produced HEMILITHOBIUS. 



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



1>. Coxae of last four legs with pores LITHOBIUS. 



hi. Coxa} of last five legs with pores PSBUDOLITHOBIUS. 



(matt. Posterior angles of the 7, 9, 11, and 13 dorsal plates produced.. NEOUTHOBITJ8. 

 aaaaa. Posterior angles of the 6, 7, 9, 11, and 13 dorsal plates produced. 



EUMTHOBIUS. 



