164 BULLKTIN 46, UNITED STATES NATIONAL MUSEUM. 



Order I.— AN AMORPH A. 



This oi<ler, jilthouph the Cermnfohi'uhc teinl to form a connectiiifj 

 link, may bci (livi<le«l into two suborders: 



a. Spinn'h's in two scries, liitcnil, with stroii^j chitinous walls; oycH not truly fac- 

 eted ; coxii' of ])rohenHori:il Ifirs joined and armed with teeth ; maxillary ]*ali>nH 

 IJ-jointed, armed with a claw, joints without sidnew; dorsal plates distinctly 

 !.'>; antenna^ not multiarticulate; tarsi not or a few of the last multiarticn- 

 late; claw of female jj^enitalia with liasal sjunes Uxciin'ALPl. 



aa. Spiracles in one series, fi, df)rsal, without stronjj; chitinous walls; eyes faceted; 

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

 maxillary palpus t-jointed, unarmed, joints with long spines; dorsal idates 8, 

 rest reduced to mere rudiments; autiuuii' and legs multiarticulate; claw of 

 female genitalia without basal spines Schizotausia. 



Suborder I.— UN UIPALPI. 



AnnhjHis of famUu'x. 



a. Tarsi of ail legs triaticulate; sjiiracles strictly lateral LrriioBllD.K. — I. 



aa. Tarsi not all triarticulate; spiracles somewhat dorsal ('eumatobiid.e. — II. 



Family 1.— LITHOBIID.E. 



Analysin of tjenera. 



a. Labruui nnidentate; a single large ocellus on each side of head; legs unarmed. 



IlENicors Newport. 

 aa. Ljiltrnm tridentate: oc«'lli absent or more tlian one; legs armed with sitines. 



LlTHomus* Leach. 



Family 11.— C'ERMATOBIID.E. 

 Contains the East Indian jieniis Cennatobius Haase. 



Suborder IL-SCHIZOTARSIA Brandt. 

 Includes the f<>llowing" family: 



Family III.— SCITTIGEKID.E. 

 Includes the cosmoi>olitau genus Scutigera Lamarck. 



Order II.— EPIMORPHA Meinert. 



J tialynis of families. 



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

 19 ; anal pleural large, scutellifonn Scolopkxdrid.k. — IV. 



aa. Pairs of legs never less than 30; antenna* 14-jointed; i)air8 of spiracles two less 

 than pairs of legs ; anal pleura; coxiform Geophilid.i-:. — V. 



"" Analysis of subgenera of Lithobius. 



a. Posterior angles of none of the dorsal jtlate produced .Vkchilithobius. 



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



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



h. CoxjTB of last four legs with pores '. Lithobius. 



bh. Coxai of last five legs with pores Pseuduli i HOBius. 



aaaa. Posterior angles of the 7, 9, 11, and 13 dorsal jdates produced.. Neolithobius. 

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



EULITHOBIUS. 



