166 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



aa. Pairs of spiracles 10. 



h. Anal pair of legs normal. 



i. First spiracle suboval Rhysida * Wood. 



ii. First spiracle trenia-shaped Trematoptychus Peters. 



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



Subfamily IY. — Scolopendropsiioe. 



Analysis of genera 



a. Ocelli absent. 



b. Tarsi of anal legs triarticnlate. 

 c. Dorsal plates not sulcata, first without a sulcus, last somewhat pointed. 



Scolopocryptops Newport. 

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



Otocryptops Haase. 



bb. Tarsi of anal legs 14-jointed Newportia Gervais. 



aa. Ocelli four ; tarsi triarticulate as in Scolopocryptops - - Scolopendropsis Brandt. 



Family V.— GEOPHILIDAE. 



Analysis of the subfamilies of Geophilidce. 



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



plate long ; basal plate small . Mecistocephalinj^. — V. 



aa. Pleurae of prehensorial legs not exposed on each side of the basal plate. 

 b. The spiracle and dorsal plates touching no pleural plates between them. 



GEOPHILIN.E . — VI. 

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



Him antariin^e . — VII. 



Subfamily V.— Mecistocephalin^e. 



Includes Mecistocephalus Newport. 



Subfamily VI. — G-eophilin^e. 



Analysis of the genera of GeophiUnce. 



a. Mandibles without a dental plate. 



b. First pair of maxilhe with two palpiform processes Geophilus Leach. 



bb. First pair of maxillie without two palpiform processes. 

 c. Exterior part of first maxillae biarticulate. 

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



Mesocanthus Meinert. 

 dd. Anal legs 6-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/ETECHelyne Meinert. 

 gg. Claw of prehensorial legs excavated on under side. 



AgathothusI: Bollmau. 



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

 1861 proposed the name Iihysida to take its place. 



t Heierostoma Newport is preoccupied (Hartm., Moll., 1843), and Dacetum Koch, 

 must be used instead. 



tAGATHOTiius, gen. no v. Type — Scolioplanes gracilis Bollmau. Ann. N. Y. Ac. Sci., 

 110,1888. Deriv. : hyadbe, good; ?/6oc, character. 



