wo. 1831. NEW TROPICAL MILLIPEDS—COOK. 463 



tremely small and are often quite remote from the margins of the 

 carinae. 



The bodies of the Stylodesmidae and most of their allies are charac- 

 terized by the strongly convex dorsum and strongly decurved carinas, 

 which contrast with the flat, depressed bodies and horizontal carinas 

 of the Pterodesmidae and related types, but this new form shows that 

 no general distinction in the shape of the body can be maintained. 

 It is one of those forms that are usually called aberrant, because they 

 do not readily find places in previous classifications. The study of 

 this type has led to a comparison of members of several other groups 

 and a review of the pertinent literature. It has also been necessary 

 to consider the characters of some undescribed forms that were 

 accessible for comparison. 



The new genus is named in honor of Mr. Chatelaine, not only 

 because he collected the specimen on which it is based, but in recog- 

 nition of his services to science in the study of the language and 

 customs of the natives of Angola, as shown in his writings on these 

 subjects. 1 



CHATELAINEA, new genus. 



Plate 60, figs, la-ln. 



Type. — Ghatelainea pterodesmoides, new species. 



Body rather small, oblong, depressed, the segments with broad, 

 nearly horizontal carinae. 



First segment large, projecting in front of the head; subflabelli- 

 form, about twice as broad as long, widest near the middle, twice as 

 wide as the head; anterior margin evenly curved, divided by fine 

 notches and radiating impressed lines into 10 subequal lobes; lateral 

 angles rounded. 



Segments plane or somewhat concave above, the carinae slightly 

 elevated; dorsal surface covered with minute hairs and irregular 

 granules or tubercles, becoming definitely raised areas along the 

 margins of the carinae and in the middle of the dorsum. 



Lateral carinae with three or four deep notches in the posterior 

 border and one or two in the lateral border, deeper on poriferous 

 segments. The lobes between the notches form convex areas distinct 

 from the more irregularly roughened remainder of the surface. The 

 anterior margin is bordered by a narrow raised ridge. (PI. 60, 

 fig. la.) 



Repugnatorial pores located on the dorsal surface at the base of 

 the posterior lateral lobe of the carina, which is more deeply notched 

 and more prominent above on poriferous segments. Poriferous lobe 

 shorter than the others on anterior segments, but longer on posterior, 



1 Folk Tales of Angola, Kimbundu Grammar, etc. 



