ICG BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



aa. Pairs of spiracles 10. 



//. Anal pair of legs normal. 



i. First spiracle suboval RH YSIDA * Wood. 



ii. First spiracle trema-shaped TREMATOPTYCHUS Peters. 



hh. Anal legs crassate ; spiracles sieve-like DACETUM t Koch. 



Subfamily IV. SCOLOPENDROPSINJE. 



.1 null/His of genera 



a. Ocelli absent. 



1>. Tarsi of anal legs triarticulate. 

 v. Dorsal plates not silicate, first without a sulcus, last somewhat pointed. 



SCOLOPOCRYPTOPS Newport. 

 cc. Dorsal plates bisiilcate, first with a transverse sulcus, last not pointed. 



OTOCRYPTOPS Haase. 



11). Tarsi of anal legs 14-joiuted NEWPQRTIA Gervais. 



aa. Ocelli four; tarsi triarticulate as in Scolopocryptops .. SCOLOPENDROPSIS Brandt. 



Family V. GEOPHILIDAE. 



Analysis of the subfamilies of G-eophilidce. 



a. Pleura? of prehensorial legs exposed on each side of the basal plate ; cephalic 



plate long ; basal plate small MECISTOCEPHALIN j\ V. 



aa. Pleurte of preheusorial legs not exposed on each side of the basal plate. 

 1). The spiracle, and dorsal plates touching no pleural plates between them. 



GEOPTIILIN.E . VI. 

 bl). Between the spiracle and dorsal plate are 1-3 rows of small pleural plates. 



IIlMANTARIINTE. VII. 



Subfamily V. MECISTOCEPHALIKUE. 

 Includes Mecistocephalus Newport. 



Subfamily VI. GEOPHILIN^E. 



Analysis of the genera of GeojthiUnd'. 



a. Mandibles without a dental plate. 



1). First pair of maxilla- with two palpi form processes G-KOPHILUS Leach. 



l)l>. First pair of maxilhe without two palpiform processes. 

 e. Exterior part of first maxilla' Inarticulate. 



d. Anal legs 7-jointod; mandibles with five pectinate plates. 



MESOCANTHTS Meinert. 



dd. Anal legs li- jointed; mandibles with a single pectinate plate. 

 e. Penultimate pair of legs normal. 

 /. Claw of prehensorial legs without a basal tooth. 



g. Claw of prehensorial legs not excavated.. . CH.ETECIIELYNE Meinert. 

 gg. Claw of prehensorial legs excavated on under side. 



ACATHOTHUS}; Bollmau. 



* As Jlranehiostoma Newport is preoccupied (Costa, Pisces, 1834), Dr. Wood in 

 1S(J1 proposed the name l{hynida to take its place. 



Mlelerostoma Newport is pro-occupied (Hartm., Moll.. 1X13), and Dacclitm Koch, 

 must be used instead. 



tAcATHomrs, gen.nov. Type Seolioplanes gracilis Hollman. Ann. A'. Y. Ac. Sci., 

 110,1888. Deriv. : uyaQbc., g 1; -J/Hoc, character. 



