102 EAST AFRICAN POLYDESMOIDEA—COOK. 



Color very dark wine-red, sliglitly paler on the posterior part of the 

 segments and carinpe. 



Length, 42 mm.; greatest width, 8 mm. 



Locality. — East Africa. One male specimen in the British Museum. 



This species, rather than the following, is made the type of the 

 new genus because the male is known. The two sjiecies are, however, 

 closely related. From the above description some minor details are 

 wanting which have been supplied in the case of the next species. 

 In most of these the two species are more probably alike than different, 

 but careful comparisons could not be made, for the descriptions were 

 not made with both specimens at hand. 



ORODESMUS BICOLOR, new species, 



(PI. V, figs. 8-14.) 



Vertex without hairs, very prominent, densely rugose, the wrinkles 

 somewhat longitudinal, below irregular and gradually becoming obso- 

 lete. A very deej) and broad sulcus, the sides of which are rugose like 

 the neighboring surface. Above and outside of the antennal sockets 

 is a large oblique depression, in which the wrinkles are coarser, but not 

 so dense. Post-antennal organ prominent, with a raised margin. 



Clypeus shining and nearly smooth, very sparsely hirsute below, ex- 

 cept just above the labrum, where a transverse furrow contains a row 

 of hairs. A broad, rather deep, obliquely oval depression subparallel 

 to the margin below and laterad from antennal sockets. 



Labrum with a moderately deep three-toothed emargination, above 

 which is a distinct transverse furrow with a row of very numerous, 

 fine, decurved bristles. 



Antennae wanting. 



Stipes of gnathochilarium hirsute with long hairs along the anterior 

 and lateral margins. 



First segment subcrescentic ; medianly convex anteriorly and broadly 

 emarginate on each side of the convexity; anterior corners broadly 

 rounded, the posterior jiointed, slightly less than a right angle. Lat- 

 eral margins with three broad, rather indistinct teeth. Surface of seg- 

 ment granular rugulose, with three transverse rows each of ftmr pointed 

 conic tubercles, the surface about each somewhat elevated, but not 

 divided into areas. The tubercles are confined to the middle of the 

 segment, not extending to the carinae ; the first row, close to the anterior 

 margin, is nearly straight, the tubercles close together, at equal dis- 

 tances, with the middle ones somewhat larger and slightly farther ahead 

 than the others. The second row has the tubercles much wider apart, 

 at equal distances, with the middle ones considerably ahead of the 

 others, but not noticeably larger. The posterior row, close to the pos- 

 terior margin, is somewhat shorter than the anterior, the two middle 

 tubercles very close together, very much the largest of the segment, 

 and somewhat behind those of the same row. Near the end of the 

 carinse is a well-pronounced ridge, starting from the posterior corner, 



