THE MYRIAPODA OF NORTH AMERICA. 161 



Subfamily XVI. — Sph^riodesmin^e. 



Analysis of the genera. 



u. The fourth aurl fifth dorsal plates largest; some of the posterior with a row of 



tubercles Sph.eriodesmus Peters. 



aa. The, third and fourth dorsal plates largest; dorsal plates tuherculated. 



Cyphodesmus Peters. 

 aaa. The third dorsal plate largest; dorsal plates smooth. 



Cyclodesmus Humb. and Sauss. 

 aaaa. The second dorsal plate largest. 



b. Anal segment small Oniscodesmus Gervais and Goudot. 



bb. Anal segment large as in the Glomeridce Cyrtodesmus Gervais. 



Order III.— ONISCOMORPHA. 



This order contains the family Glomeridce, which is related to the 

 preceding family. 



Family VII.— GLOMERID^. 



Analysis of the subfamilies of Glomeridce. 



a. Segments 13; pleural plates 11 or 12; pairs of legs $ 21, $ 23; ocelli in more than 

 one series Sph.ekotheriin.'E. — XVII. 



aa. Segments 11 or 12; pleural plates 10; pairs of legs 9 17, $ 19; ocelli in a single 

 series Glomeriinte.— XVIII. 



aaa. Segments 9 ; antenna? 5-jointed ; ocelli in several series . . . Olic.aspiin.e. * — XIX. 



Sub-family XVII. — SphtERiotheriin^g. 



Analysis of the genera of Sphceriotheriince, 



a. Antennae 7-jointed, the sixth joint smaller than the fifth. Sph.erotherium Brandt. 

 aa. Antennae 6-jointed, the sixth much larger than the fifth Zephroxia Gray. 



Subfamily XVIII. — Glomeriinte. 



Analysis of the genera of Glomeriinw. 



a. Mentum bipartite; dorsal plates smooth, not marginate. 



b. Copulation feet of the male 5-jointed, ending in a simple, weak, crooked joint, 

 • which bears a short and thick bristle; 12 dorsal plates plainly developed. 



Glomeris Latreille. 

 bb. Copulation foot of male 3-jointed, ending in a shear or forceps-like piece, which 

 does not bear a bristle; only 11 dorsal plates plainly developed. 



Latzelia tBollman. 

 aa. Mentum entire; dorsal plates warty and scaly, their borders strongly margined. 



Gervai.sia Waga. 



Subfamily XIX. — Oligasphn^e. 

 Contains the South- African genus Oligaspis Wood. 



* If Wood's description of the genus Oligaspis is correct it should represent a new 

 subfamily. As shown by the figures his types are adult specimens. 



t Latzelia gen. nov. Type: Glomeris minima Latzel. I have named this new genus 

 after Dr. Robert Latzel, of Vienna, the illustrious Austrian myriapodist, and the 

 describer of Glomeris minima. 



2097— Xo, 46 11 



