260 PROCEEDINGS OF THE ACADEMY OF [1896. 



Anisodesmus cerasinas. 



Perhaps doubtfully distinct from A. erythropus (Lucas) in the 

 greater size and lighter color, all the specimens from the interior 

 differing thus from individuals CT)llected at Monrovia. Length 

 41 mm., width of male b.b, of female 6.5 mm. The length of what 

 I have identified as erythropus is about 35 mm. The species can, 

 however, hardly be determined with confidence from Lucas' des- 

 cription. Both forms are very beautiful in life, deep wine-color, 

 with bright cherry-pink legs. 



Isodesmus immarginatas. 



Resembles Lyrodesmus and Cheirodesnms, but is distinctly broader 

 than either, and distinct from all the related forms in the absence 

 of a distinct poriferous callus, the margin being sinuate. Legs and 

 antennae more slender than in Anisodesmus, but less so than in 

 LyrodesTmis and Cheirodesmus. Color uniform black, the antennse 

 and apical joints of the legs also dark. Copulatory legs also very 

 distinct in that the outer ramus is broad and bifid, while the inner 

 is trifid, giving five distal divisions. Length -42 mm., width 5 mm. 



Isodesmus interraptus. 



Is somewhat larger than the above and has the carinje of the 

 poriferous segments pale yellow. It is known from a female spec- 

 imen only. 



Oxydesmus medius. 



Black or very dark %'inous ; carinag concolorous ; legs and antennse 

 also dark ; length 52-66 mm,, width 10-12 mm. 



Oxydesmus liber. 



Dark chocolate-brown to black ; ends of the carinse, especially the 

 submarginal ridge, yellow or orange ; antennse and legs hght yellow 

 or orange; length 68-80 mm,, width 12-13 mm. 



Bactrodesmus claviger. 



Antennae very long and slender, clavate, sixth joint longest, 

 scarcely exceeding the third ; dorsum much as in Polydesmus, with 

 three rows of scattering tubercles, each with a large clubbed hair; 

 pores dorsal, of the usual arrangement ; penultimate segment toothed 

 behind ; first legs reduced, the second greatly enlarged, especially 

 the penultimate joint ; last joint curved ; claw very short, broad ; 

 copulatory legs with the basal joint much enlarged, galeate, contain- 

 ing the apical joint when at rest ; length 7 mm,, width 1 mm. 



