48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



Description. — Body elongate-oval and less than four times as long 

 as broad ; both specimens measuring 13 mm in length and 3.7 mm in 

 width. Dorsum strongly convex, much more so than in trinidadensis, 

 and the lateral carinae descend more obliquely. 



The living animals were dull black above throughout, lighter be- 

 neath. 



Head with a very pronounced, broad, deep furrow just above 

 the antennae separating the frontal region from the raised, medianly 

 furrowed, granular vertex ; clypeal region suddenly elevated above the 

 frontal region, smooth and shining. 



First segment about a third narrower than the midbody segments ; 

 anterior margin evenly rounded, the surface behind the marginal 

 areas with densely scattered small granules. 



Fig. 24.—Docodesmns robustns. a, last 2 segments, anal valves and scale, ventral 

 view; b, side view of a gonopod from above and slightly behind. 



Ensuing segments without longitudinal or transverse lines divid- 

 ing the surface into large polygonal areas, and without any definite 

 series of large tubercles ; instead, the dorsal surface, except the usual 

 smooth sulcate areas of the posterior margin and the lateral carinae, 

 is densely scattered with small tubercles of various sizes, the median 

 ones somewhat rounded but those on the sides of the dorsum and 

 adjacent carinae are definitely cuspidate and each is surmounted by 

 a very tiny and very short seta. Posterior marginal areas at the middle 

 of the dorsum very short, not projecting beyond the margin as crena- 

 tions except on several of the last segments. Anterior raised rim con- 

 tinuous across the dorsum, where its apex is slightly undulated. 



Last segment with two large appressed, triangular tubercles above. 

 Lateral lobes large, the median one broad, rounded-transverse behind. 

 Ventrally, the four apical setae are protected on each side by a strong 

 conic tubercle which projects backward (fig. 24, a). 



