THE MYRIAPODA OF NORTH AMERICA. 165 



Family IV. SCOLOPENDRID.K. 



.iinili/sis of x 



a. Pairs of legs 21. 



b. Tarsi, except anal, biarticulate; pairs of spiracles 19; ocelli absent. 



PLUTONIIN.E. I. 

 bb. Tarsi, except last two, biarticnlate ; pairs of spiracles 10; ocelli absent or 



single CKYPTOIM N i . II. 



bbb. All the tarsi triarticulatc; pairs of spiracles 9 or 10; ocelli i. 



SroLol'I.MHUN.K. III. 



an. Pairs of legs 23; tarsi, except the last two, biarticulate; pairs of spiracles 10; 

 ocelli absent or present SCOLOPENDKOI-SI N i : . IV. 



Subfamily I. PLUTONIINJE. 



Contains the European genus Plutonium Cavarma. 



Subfamily II. CRYPTOPIN.E. 



.i IKlll/XJH of l/l'lll-rit. 



a. Last dorsal plate normal; anal legs not crassate. 



b. Ocelli absent CltYPTOPS Leach. 



bb. Ocelli present, single EREMOPS* Bollman. 



((. Last dorsal plate twice as large as preceding; anal legs short and thick; ocelli, 

 absent THEATOPS Newport. 



Subfamily III. SCOLOPENDKIN.K 



Analysts of gencni. 



a. Pairs of spiracles 9. 



b. Spiracles not branchiform. 

 c. Claw of maxillary palpus simple, unarmed; anal pair of legs short and 



crassate \ SAN ADA Meinert. 



cc. Claw of maxillary palpus armed on the inner side with two teeth. 

 <l. Claw of anal pair of legs not crenulate beneath. 



c. Cephalic plain subcordiform, usually partly covering lirst dorsal plate. 



So il.OI'KNDRAt LilllliCUS. 



IT. Cephalic plate more or less round or quadrate; partly concealed l>\- ih-.st 



dorsal plate CORMO< EI-IIAI.US Newport. 



iltl. Claw of anal legs crenulate K'HODA Meinert. 



bb. Spiracles branchiform. 



/'. Claw of maxillary palpus armed on the inner side with a long acute 



tooth; anal pair of legs normal OTOSTICMA Porath. 



//'. ('law of maxillary palpus armed on the inner side \\ ith two long acute 



teeth; anal pair of legs not normal. 



;/. Tarsi of anal pair of legs very much depressed . . Kr< i >KYIIA> ( icrstiickcr. 

 </</. Anal legs short and thick but the tarsi not tlattened. 



CtTil-KS Kohlraiisch. 



*Kn'inoj>x, Noiu. gen. nov. for Moito/i* (Jervais. which is preoccupied. 

 \ Scolopendrn may be divided into two sul>gcnera. 



n. Only the femora of anal pair of legs u ith spines Sculopendra. s. sir. 



aa. Femora of more than anal pair with spines ( 'oil aria Porath. 



