49 2 Memoirs on the Coleoptera 



humeri a fourth wider than the prothorax, two and one-half times as long, the 

 sides oblique, feebly arcuate, the apex rapidly and obtusely but not very broadly 

 rounded; surface very smooth, with strong subapical umbones, prominent second 

 and third intervals at apex and a concavity between these and the umbones; 

 striae very fine and almost completely obsolete, impunctate; male abdomen with 

 a deep elongate impression medially toward base, the fifth segment not at all 

 impressed, minutely, sparsely punctate. Length 7.8 mm.; width 3.3 mm. 

 Brazil (Rio de Janeiro). October. One specimen. [Baridius conicollis Boh.] 



I had already assigned these two genera to the end of the series, 

 where they might form one of the passages to the Madopterini, 

 long before consulting the original description of Kirsch, and it was 

 therefore a source of gratification to find that the author had actually 

 assigned Anopsihis to the Madopterini. 



Tribe Madopterini 



In this tribe I have united the Nertids and Madopterids of 

 Lacordaire, which have the body peculiarly elongate and more or 

 less parallel and therefore, in habitus alone, remarkably different 

 from anything observable in the other tribes of the subfamily; 

 some of them have the pygidium exposed, and a few have this part 

 completely covered by the elytra, and the prosternum is transversely 

 truncate behind, or at least never with distinct posterior lobe. It 

 would be very difficult to find a satisfactory place for these elongate 

 parallel forms among the Centrinids or Barids, and this is the prin- 

 cipal reason for associating them to form a special tribe at the end 

 of the series — no more heterogeneous in regard to the pygidium 

 than the Madarini, where that part may be wholly concealed, 

 though generally exposed. In the structure of the prosternum 

 they more closely resemble the Barids or Sonnetius, than any of 

 the Madarids. Unfortunately there are rather numerous described 

 genera which do not seem to be represented in my collection, such as 

 Nertus, Lichnus, Lispodemus, Parallelosomus and Trachymerus , and 

 I am therefore compelled to omit these in the following comparative 

 statement : 



Pygidium distinctly exposed behind the elytra, though usually short, never 



prominent or strongly convex 2 



Pygidium covered by the elytra 6 



2 — Anterior femora bifurcate at apex, the lower ramus narrower and curved, 

 becoming parallel, sometimes subobsolete and replaced by a simple distal 

 inferior tooth, the other femora nearly always minutely denticulate beneath. 

 Body very elongate but not quite parallel, convex, glabrous or sparsely 

 squamose above; beak slender, moderately long, sometimes deeply and 

 peculiarly constricted above near the base and also below but less basally; 

 prosternum long, not modified, the coxae large, more or less narrowly sepa- 

 rated; antennae rather long and slender; tarsal claws connate. [Type P. 

 distortus nov.] Pacomes 



