6 U.S. NATIONAL MUSEUM BULLETIN 266 



Lophoproctinus notandus Silvestri 1949, p. 4. 

 TYPE: Location unknown. 

 TYPE LOCALITY: San Francisco, Veracruz, Mexico. 



Family POLYXENIDAE 



Genus BARROXENUS Chamberlin 1940a, p. 3. 



TYPE SPECIES: Barroxenus panamanus Chamberlin, by original des- 

 ignation. 

 Barroxenus panamanus Chamberlin 1940a, p. 3. 



TYPE: Collection of R. V. Chamberlin. 



TYPE AND PARATYPE LOCALITY: Barro Colorado Island, Canal 

 Zone, Panama. 



Genus POLYXENUS Latreille 1802, p. 45. 



TYPE SPECIES: Scolopendra lagura Linnaeus, by monotypy. 

 Polyxenus poecilus Chamberlin 1923a, p. 400. 



TYPE: Mus. Calif. Acad. Sci., no. 1256. 



TYPE LOCALITY: Isla Santa Ine'z Sur, Golfo de California, Baja Cal- 

 ifornia, Mexico. 



PARATYPE LOCALITIES: Puerto Bellandra, Isla Carmen; Isla Mon- 

 serrate, Golfo de California, Baja California, Mexico. 



Subclass CHILOGNATHA 



KEY TO SUPERORDERS OF CHILOGNATHA 



1. Gonopods of male modified from one or both pairs of legs at caudal 



end of body; legs of 7th segment not modified PENTAZONIA 



Gonopods of male modified from at least one pair of legs of 7th seg- 

 ment. 



2. First legs of 7th segment of male not modified; eight pairs of legs 



in front of gonopods COLOBOGNATHA 



First legs of 7th segment of male modified into gonopods; seven 

 pairs of legs in front of gonopods HE LMINTHOMOR PH A 



Superorder PENTAZONIA 



KEY TO ORDERS OF PENTAZONIA 



1. Body short, composed of 14 to 16 segments, and contractible into a 



ball GLOME R IDA 



Body elongate, composed of 19 to 21 segments, not contractible in- 

 to a ball GLOMERIDESMIDA 



