390 Memoirs on the Coleoptera 



more than twice as wide as long (c?)> or much smaller but transverse and semi- 

 circular ( $ ), closely punctate; abdomen scarcely modified in the male, the last 

 three sutures very coarse ; anterior coxae widely separated, the posterior prosternal 

 lobe broad, extending rather behind the mesocoxal tangent and feebly sinuato- 

 truncate. Length 2.2-2.5 mm.; width 1.3-1.4 mm. Brazil (Santarem). Five 

 specimens. 



This species agrees rather well structurally with the northern 

 forms, but the thoracic punctuation is much less uniform. 



Micromadarus n. gen. 



In this well defined genus the body is very small for the present 

 section, stout, suboblong-oval, convex and subglabrous, the elytra 

 with dense basal squamose areas somewhat as in Linomadarus . 

 The beak is moderate, cylindric, gradually more arcuate distally, 

 very feebly sculptured, separated by the faintest possible broad 

 impression and with the mandibles obtuse at apex, non-decussate, 

 straight and dentate within. The antennae are very slightly post- 

 median, the first funicular joint as long as the next three, the second 

 barely longer than wide, the others moderately transverse, increasing 

 in size, the club large, oval, as long as the six preceding joints. 

 Prosternum peculiar, being elevated in a strong narrow transverse 

 ridge between the coxae, thence sloping upward and feebly concave 

 to the apex, the posterior lobe scarcely at all evident, but on a level 

 with the mesosternum, the coxae separated by one-half more than 

 their width. The legs are slender, the femora not at all inflated, 

 minutely denticulate beneath, the tarsal claws short and arcuate. 

 The prothorax is abruptly tubulate, the basal lobe very short and 

 feeble, broadly rounded, the scutellum closely fitted, ogival and the 

 elytra deeply but not coarsely grooved. The pygidium in the type 

 is small, vertical, transverse, rounded beneath, flat and densely 

 punctate. The type is the following: 



Micromadarus collaris n. sp. — Oblong-suboval, convex and deep black through- 

 out, moderately shining, the elytra somewhat alutaceous; beak (cf) evenly 

 cylindric, shining, finely, sparsely punctate, distinctly arcuate, straighter basally 

 and a fourth longer than the head and prothorax; antennae blackish; prothorax 

 large, nearly a third wider than long, the parallel sides unevenly arcuate, very 

 rapidly rounding and subtransverse at apex to the tubulation, which is somewhat 

 more than half as wide as the base; disk widest at basal third; punctures nude, 

 moderate in size but deep, dense laterally, a little smaller and well separated 

 medially, without well defined smooth line; elytra small, oval, but little longer 

 than wide, not wider than the prothorax and only two-fifths longer; grooves 

 narrow, smooth, becoming coarser and somewhat crenate basally, the intervals 

 glabrous, finely but distinctly and confusedly punctate, the second and third 

 each with an oblong spot of dense whitish scales at base, the outer the longer; 

 male abdomen minutely, sparsely punctate, shining, with a very feeble simple 

 medio-basal impression, the first suture almost obsolete. Length 2.8 mm.; 

 width 1.3 mm. Brazil (Santarem). One specimen. 



