THE MYRIAPOPA OF NORTH AMERICA. 171 



1870.— Heterostomii Humb. & Sauss. Rev. et Mag. Zool., 202. 

 1880.— Seolopendrii Humb. & Sauss. Rev. et Mag. Zool., 203. 



1881. — Seolopendaidea ancMstropM Kohlrausch. Archiv f. Naturg. (used as a tribe of 

 Scol. cribriferes). 



Analysis of the genera of SooTopenarmce. 



a. Pairs of spiracles 9. 



b. Spiracles not branchiforni. 

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



Asanada Meinert. 

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

 d. Claw of anal pair of legs not creuulate beneath. 

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



SCOLOPENDRA. — III. 



ee. Cephalic plate rounded or quadrate and partly concealed by first dorsa. 



plate Cormocephaltjs Newport. 



dd. Claw of anal pair of legs creuulate beneath Rhoda Meinert. 



bb. Spiracles branchiforni . 



/. Claw of max. palpus armed on the inner side with a long, acute tooth; 



anal pair of legs normal Otostigma Porath. 



ff. Claw of max. palpus armed ou the inner side with two long, acute 

 teeth; anal pair of legs not normal. 



g. Tarsi of anal legs much depressed Eucorybas Gerstacker. 



gg. Tarsi not flattened: leg short aud thick Cupipes Kohlrausch. 



aa. Pairs of spiracles 10. 

 h. Anal pair of legs normal. 



i. First spiracle suboval Rhysida. * — IV- 



it. First spiracle-shaped Trematoptychus Peters. 



hh. Anal pair of legs crassate; spiracle sieve-like.. Dacetum t Koch. 



Genus III.— SCOLOPENDRA. 



1758. — Scolopendra Linmeus. Syst. Nat., Ed. x., 637 (restricted by later authors to 

 morsitans). 



Type. — Scolopendra morsitans L. 



Etymology: axoXozevfipa, scolopendra. 



In the following key to the species of Scolopendra 1 have adopted 

 Poratk's name Collar ia as a subgenus including all species which have 

 the femora of penultimate pair of legs spinous. The other groups es- 

 tablished, I think, are not worthy of subgeneric rank. 



* As Branchiostoma Newport is preoccupied (Costa, Pisces, 1S34), Rhysida Wood 

 must be used instead. 



t Heterostoma Newport preoccupied (Hartm., Moll., 1843) and Dacetum Koch must 

 take its place. 



