472 PR0GEEDIN08 OF THE NATIONAL MUSEUM. vol.40, 



prominent papilliform processes, a tendency only faintly suggested 

 on the posterior segments of Cliatelainea. 



The repugnatorial pores are extremely minute, much more so than 

 in Cliatelainea, but they occur on the same segments, near the base 

 of the posterior lobe of the carina, near the base of the lateral notch. 

 A further peculiarity of Iomus is that the segments without pores, 

 4, 6, 8, 11, and 14, have a distinct tubercle near the middle of the 

 carina, while such tubercles are usually quite absent on poriferous 

 segments. (Fig. 2.) 



The basal joints of the antennas are rather more slender in Iomus 

 than in Cliatelainea, and the second joint is much shorter than the 

 third, whereas in Cliatelainea it is distinctly longer than the third. 



The first segment of Iomus has the anterior margin only slightly 

 upturned and the marginal areas are indicated below by very faint 

 impressed lines. The last segment does not project as in Cliatelainea, 

 but is covered and concealed under segment 19, somewhat as in 

 Stylodesmus. 



In the absence of any definite indication of affinity with members 

 of other families of Stylodesmoidse, it seems to be necessary to con- 

 sider Cliatelainea as representing a distinct group. 



CHATELAINEID.E, new family. 



African millipeds of the superfamily Stylodesmoidse, but with 

 external similarity to the Pterodesmoidse. 



Body small, oblong, depressed, with horizontal or slightly ascend- 

 ing carina?, deeply lobed on the lateral and posterior margins. 



First segment moderately large, rounded in front, covering th« 

 rather small, depressed head. 



Dorsal surface of segments nearly flat, covered with slightly convex 

 rounded or radiating areas and hispid with short hairs, but without 

 prominent spines, crests or tubercles. Poriferous carinas deeply 

 lobed on the lateral margins; posterior corners produced into long 

 recurved teeth on posterior segments. 



Repugnatorial pores opening on the dorsal surface, near the base 

 of the posterior lobe of the carinas, not borne on a prominent cylin- 

 drical or conical tubercle. 



Supplementary margin dissected into minute oblong lobes. 



Last segment with a projecting conical apex, not covered by the 

 penultimate segment, but exceeded by the greatly produced posterior 

 corners of the penultimate. 



Legs slender, joint 2 nearly as long as joints 3 and 6. 



Gonopods with basal joint expanded and hollowed out to contain 

 the small retracted second joint. 



