lO 
OXYDESMIDAl, 
Anterior segments dorsally somewhat thickened, raised and prominent over 
a bright-colored median area occupied by several mesial tubercles of each of 
the last two rows ; tubercles of anterior segments not conspicuously enlarged 
or coalesced into ridges or processes: Genus Lyodesmus, nov., tyv^ 
zoster, sp. 7 i., East Africa. 
Some or all of the anterior segments (1-4) with the median or posterior 
tubercles conspicuously enlarged. ......... 
Segments 1-4 with the median and especially the posterior tubercles evi- 
dently hypertrophied, but not coalesced in the median line : Genus Rhodo- 
mus, nov., type Rh. priodus, sp. n.. East Africa. 
Segments 1-4, or some of them, with a conspicuous median process formed 
by the coalescence of two or more of the posterior tubercles. 
Third segment only with a process ; this is comb-like, very large, and re- 
curved so as to cover entirely the median part of the fourth segment : Genus 
Ctenodesmus, nou., type Ct. gibber, sp. n.. East Africa. 
Processes of first and second segments distinct, equal to or smaller than that 
of the third segment. . . . . . . . . . . . 
Segments 2-3 with the two median tubercles of the posterior row enormously 
hypertrophied into a long, slender, recurved, canaliculate process ; the first 
segment has also a small process : Genus Ceratodesmus, nov., type C. ajisatus, 
sp. n.. East Africa. 
Process not long, slender, and recurved; appearing rather in the form of a 
transverse crest of enlarged tubercles coalesced at base, and scarcely projecting 
beyond the posterior margin of the segment. ...... 
Fourth segment normal; copulatory legs slender, the two princinal rami 
extended into long, slender, falcate, approximate, incurved processes ; a slen- 
der ventral ramus extends mesad and distad to meet or cross its fellow : Genus 
Phobodesmus, nov., type Ph. cristatus, sp. n.. East Africa. 
Fourth segment with a distinct process similar to that of the third ; copula- 
tory legs pedicellate, stout, not deeply divided into slender rami : Genus Oro- 
desmus Ck., East Africa. 
EIST OF SPECIES. 
1. ScYTODESMUS KRiBi Cook ; Kamerun ; Berlin Museum. 
2. ScYTODESMUS coNNivENS, Sp. H. Smaller and more convex than Sc. kribt ; 
lateral carinse narrower, the edges with four or five sharp teeth ; copu- 
latory legs similar to those of Sc. kribi, but shorter and more robust ; 
length about 18 mm., width 5 mm. ; locality Bismarckburg, Togo Col- 
ony, collected by Conradt ; Berlin Museum. 
3. Plagiodesmus obliques Cook ; Congo Valley ; British Museum. 
4. Plagiodesmus occidentalis (Karsch) ; Quango; Berlin Museum. 
5. Lacnodesmus campii (Cook); Congo Valley; U. S. Nat. Museum. 
6. Lacnodesmus valgus, sp. n. Very distinct from the other species in size, 
dorsal sculpture, and form of copulatory legs. Segments with tubercles 
slightly developed, appearing as broadly rounded or flattened rugulose 
prominences or convex areas ; last segment with sides diverging, though 
the apex proper is rather narrow ; copulatory legs with the apical arms 
more crassate and the lateral spine longer than in L. campii ; length 70 
mm. ; locality Africa ; Philadelphia Academy. 
