THE MYRIAPODA OF NORTH AMERICA. 165 



Family IV.— SCOLOPENDRIDyE. 



Analysis of subfamilies, 



a. Pairs of legs 21. 



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



Plutoniin^. — I. 

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



single Cryptopin/E. — II. 



bbb. All the tai-si tri articulate; pairs of spiracles 9 or 10; ocelli 4. 



SCOLOPENDRINVE.— III. 



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

 ocelli absent or present Scolopendropsin-e. — IV. 



Subfamily I. — Plutoniin^e. 



Contains the European genus Plutonium Oavanna. 



Subfamily II. — Cryptopin^e. 



Analysis of genera. 



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



b. Ocelli absent CRYPTOPS Leach. 



bb. Ocelli present, single Eremops* Bollman. 



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

 absent Theatops Newport. 



Subfamily III. — Scolopendrin^e. 



Analysis of genera. 

 a. Pairs of spiracles 9. 



b. Spiracles not branchiform. 

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



crassate Asanada Meinert. 



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

 (I. Claw of anal pair of legs not crenulate beneath. 

 " e. Cephalic plate subcordiform, usually partly covering first dorsal plate. 



SCOLOPENDRAt LinniBUS. 



ee. Cephalic plate more or less round or quadrate; partly concealed by first 



dorsal plate . Cormocephalus Newport. 



dd. Claw of anal legs crenulate Rhoda Meinert. 



bb. Spiracles branchiform. 



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



tooth ; anal pair of legs normal Otostigm a Porath . 



ff. Claw of maxillary palpus armed, on the inner side with two long acute 



teeth; anal pair of legs not normal. 

 g. Tarsi of anal pair of legs very much depressed . . Eucorybas Gerstiicker. 

 gg. Anal legs short and thick but the tarsi not flattened. 



Cupipes Kohlrausch. 



* Eremops, Nom. gen. nov. for Monops Gervais, which is preoccupied. 

 t Scolopendra may be divided into two subgenera. 



a. Only the femora of anal pair of legs with spines Scolopendra, s. stir. 



aa. Femora of more than anal pair with spines Collaria Porath. 



