62 Memoirs on the Coleoptera 



and feebly impressed at base; sterna and legs nearly smooth, the femora cylindric; 

 tibiae feebly arcuate, cylindric and unmodified; third tarsal joint well dilated, 

 the claws well developed, arcuate and widely diverging. Length 6.3 mm.; 

 width 3.7 mm. Colombia. A single specimen, sent by Desbrochers des Loges. 



The prosternal sulcus is very abrupt, deep and capacious, about 

 as wide as the beak, the anterior coxae separated by half their width. 



Hiotus n. gen. 



This is a very large genus, the characters of which, as derived 

 from the type species, differ considerably from those of Diorymerus, 

 with which it is usually associated. The body is evenly ovoidal, 

 with but little difference in width between the prothorax and 

 elytra, with polished glabrous surface, transversely swollen and 

 coarsely, densely sculptured first ventral segment and slender and 

 perfectly free but variably diverging tarsal claws. The beak and 

 the capacious deep and abruptly limited prosternal sulcus, are 

 nearly as in Diorymerus, but the antennal club is smaller, being 

 very much shorter than the funicle as a rule, densely pubescent, 

 oval, pointed and with more obvious sutures. The body varies 

 from very moderate to minute in size, including some of the smallest 

 of the entire Barinse. 



The heterogeneity of the species indicates that they should be 

 divided into a number of subgeneric groups, which may be outlined 

 as follows: 



Antennal club much longer, narrower and elongate-oval, subequally segmented. 2 

 Antennal club smaller and oval, though similarly segmented, pointed apically 



and with very distinct sutures 5 



2 — Body larger, the first abdominal segment strongly, transversely swollen and 



coarsely, very conspicuously punctate in both sexes 3 



Body very small in size 4 



3 — Outline very broadly oval, almost subcircular in some cases, the surface 



bicolored I 



Outline more rhombic-oval, of a very intense and highly polished black through- 

 out II 



4 — Tibiae angulate to strongly dentate externally at or near the base Ill 



Tibiae more slender, rounded externally toward base IV 



5 — Abdomen not modified in any way at base, flat, smooth and polished V 



These groups are very unequal in size, though none is founded 

 upon a single species, the second and third are by far the largest. 

 The last three, because of their minuteness, present in mass a very 

 different appearance from the first two, and I have no doubt at all 

 that they are all at least subgeneric and are so considered below. 



