NO. 1154. AMERICAN MEROCHETA— COOK. 459 



Last 8e<?ment with the apical papilla? located below the projecting 

 notched rira. 



Anal valves and preanal scale entirely flat. 



The afiinities of this and the preceding genus may prove to lie with 

 Doratodesmus rather than with other American forms or even Cyrto- 

 desmus. 



In the greatly enlarged second segment and the tnberculate segments 

 this genus resembles Oncodesmus rather than Ci/rtodesmus, but the 

 his])idity of the tubercles gives a general appearance more like that of 

 Cyrtodesmus, for Oncodeamus is coarsely granular and not hispid at all. 



CYLIOCYRTUS ASPER (Peters). 



(Plato XXX, figs. 3a, 3(/.) 



Cyrtodesmus asper Peters, Monatsber, R. Akad., Wise, Berlin, 1864, j). 618. 



Type. — Berlin Museum. 

 Locality. — Bogota, Colombia. 



Family CYCLODESMIDiR Silvestri. 



Cyclodesmidw Silvestri, Ann. Mas. Civ., Geneva, 1895, XXXIV, p. 747. 



Body very small, about five times as long as broad; dorsum very 

 strongly convex, the carinaj broad, vertical ; surface of segments smooth 

 and polished. 



Antennte moderately robust, filiform, joint 6 slightly longer than 

 joint 2, and distinctly larger than joints 3 to 5, which are subequal. 



Second segment crescentic, much smaller than the third, which has 

 the carina' much expanded and projecting downward far beyond the 

 level of the others. 



Lateral carime rounded-triangular on anterior segments, with a 

 straight lateral margin and distinct posterior corner on posterior seg- 

 ments. 



Kepugnatorial pores wanting. 



Supplementary margin wanting. 



Last segment large, subquadrate, many times broader than the cari- 

 nje of segment 19; its posterior margin forms an even, thin edge. 



Copulatory legs not known. 



Genus CYCLODESMUS Humbert and Saussure. 

 Cyclodesmus Humbert and Saussure, Revne et Mag. Zool., 1869, p. 149. 



CYCLODESMUS AZTECUS Humbert and Saussure. 



Cyolodesmus aztecus Humbert and Saussure, Revue et Mag. Zool., 1869, p. 150; 

 Etudes Hur les Myriap., 1872, p. 24, pi. i, figs. 3-3c. 



Type. — Supposed to be in Paris. 

 Locality. — b^astern cordilleia of Mexico. 



