MILLIPEDS OF MEXICO AND CENTRAL AMERICA 105 



PARATYPE LOCALITIES: Same and Trinitaria, Chiapas, Mexico. 

 Orthoporus zizicolens (Chamberlin). New combination. 



Gymnostreptus zizicolens Chamberlin 1938a, p. 168. 



TYPE: Collection of R. V. Chamberlin. 



TYPE AND PARATYPE LOCALITY: Ziz Cave, Oxkutzcab, Yucatan, 

 Mexico. 



Superorder COLOBOGNATHA 



The two most recent revisionary papers on the superorder Colobognatha 

 are Verhoeff 1941 and Attems 1951. The first proposes numerous nomen- 

 clatorial changes, principally in genera of the family Siphonophoridae, 

 and adds no new species from the area encompassed by this list. Attems' 

 paper is a revision of the superorder but it omitted mention of so many 

 previously described genera, and contained such obvious errors, as well 

 as departures from the rules of nomenclature, that it is a most unsatis- 

 factory treatment. To produce a workable and acceptable classification, 

 both papers need a thorough study by someone with a large reference col- 

 lection of species at hand. The proposals in these papers have been 

 limited here to inclusion of the two species described by Attems from 

 Costa Rica. 



KEY TO THE ORDERS OF COLOBOGNATHA 

 1. Gnathochilarium having the usual parts represented in miHipeds; seg- 

 ments with a distinctly impressed median sulcus. 



PLATYDESMIDA 

 Gnathochilarium represented by a triangular plate, or the usual di- 

 visions indistinctly indicated at most; segments without an im- 

 pressed median sulcus POLYZONIIDA 



Order PLATYDESMIDA 



KEY TO THE FAMILIES OF PLATYDESMIDA 



1. Sterna narrow, the coxae close together separated only by a prominent 



sternal process AN DROGN ATHIDAE 



Sterna very broad and lacking median processes; coxae very widely 

 separated PL ATYDESMIDAE 



Family ANDROGNATHIDAE 

 Genus BRACHYCYBE Wood 1864, p. 187. 



TYPE SPECIES: Brachycybe lecontei Wood, by monotypy. 

 Brachycybe producta Loomis 1936, p. 367. 



TYPE AND PARATYPE LOCALITY: Baja California, Mexico. 



OTHER LOCALITY: Vernal Falls, Yosemite National Park, Mariposa 

 Co., California, (Causey 1955). 



