466 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Closely allied to the preceding-, but distinct in the much less promi- 

 nent elevations of the segments. The surface itself seems, however, 

 to be rougher than in T). earlei and the adherent matter is more abund- 

 ant, giving the creature a more uniform and darker color. Following 

 is Bollman's original description of the species, evidently drawn partly 

 from living material. The II. S. National Museum contains one of the 

 original specimens, the female. 



General color pinkish, especially posteriorly, anterior half of sepjihents darkest, 

 a black median dorsal line, antenna' dark, logs pale. IJody widest and highest 

 anteriorly, tapering posteriorly, smootli, seta' absent. Vertex smooth, somewhat 

 eulcate. Antenna' subelavate, about equaling width of body. Dorsal plates smooth, 

 four preceding the last with an indistiuct row of obtuse scales ; lateral plates, except 

 the first, antepenult and ]>onult, with their posterior margin serrate. Anal plate 

 triangular with the angles ronnded, sparsely pilose. Legs long and slender, extend- 

 ing beyond sides of body. Male : Ventral plate of second pair of legs produced 

 into two short cones; coxa> of second and third pairs )nore pilosi! than others; 

 copulation foot much twisted, end expanded and divided, pilose. Length of body, 

 7 mm. ; width, 2 mm. 



Habitat. — Little Rock and Okidona. 



From this it appears that the copulatory legs are also considerably 

 different from those of J), earlei as here figured. 



The curious cavities described on the segments of J), earlei are i)res- 

 ent in identical form in the present species, but their unique character 

 and position might well account for their being overlooked. Moreover, 

 they are in most cases filled up and concealed by adherent particles of 

 dirt. 



Genus CYPHODESMUS Peters. 



Oniscodesmiis Saussuuk, Morn. Mex. Myriaj)., 18(50, p. 20 (not Oniseodesmus Ger- 



vais and (ioiulot). 

 CyphodexmiU Thtkus, Monatsber. K. Akad. Wiss. Berlin, 1864, p. 530. 



The affinities of Gyphodesmn.'i seem to lie with Desmonns; at least 

 this is the inference otie is obliged to draw from the descriptions and 

 figures ol the type and only known species. Generic distinctness is, 

 however, indicated by the comparatively slight development of the 

 carina' of the third segment in GyphodesmuH., the mu(!h larger, more 

 prominent, and somewhat spiniform process with which the segments 

 are armed, and finally the much greater size, being several times as 

 large as Dcsmonus. It would seem doubtful whether Gyphodesmns is 

 able to coil up as effectively as Desmonns, as the anterior segments are 

 figured like the others, with a transverse row of tubercles. No mention 

 of the large cavities of the segments of Besmonus is made, but their 

 unusual position miglit well account for their being overlooked, as in 

 the case of Bollman's species of Besmonus. 



