86 Memoirs on the Coleoptera 



prothorax, the striae very fine and subobsolete, the sutural, and 9 and 10, 

 posteriorly, deeper; strial punctures fine, remote and very feeble; under 

 surface rather finely, sparsely punctate; abdomen (cf) with a small, rounded 

 and feeble basal impression, which is finely pubescent, or ( 9 ) perfectly 

 simple and rather convex; legs similar in the sexes throughout, the outer 

 margin of the tibiae rounded basally. Length 4.2-4.4 mm.; width 2.75-2.9 



mm. Brazil (Santarem). Two specimens nigricauda n. sp. 



Body more elongate-oval, the coloration and lustre exactly similar, except that 

 the pronotum is very obscure rufo-piceous and not intense black; beak and 

 antennae nearly similar; prothorax less transverse, only slightly more than 

 one-half wider than long, similarly sculptured, except that the fine and 

 sparse punctures of the pronotum are much deeper and more distinct; basal 

 lobe more broadly rounded; scutellum similar; elytra fully as long as wide, 

 a fifth wider than the prothorax, broadly and obtusely oval, the feeble 

 humeral callus with slightly darker coloration than the ground, as in the 

 preceding; striae fine and shallow but very much more distinct than in 

 nigricauda, the punctures similarly widely spaced but distinctly stronger; 

 femora strongly, loosely punctate; abdomen (d") as in the preceding. 

 Length 4.25-4.5 mm.; width 2.7-2.8 mm. Brazil (Chapada). January 

 and November. Three male specimens, found on flowers near the forest. 



subsimilis n. sp. 



It is interesting to note that the abdomen lacks the asexual basal 

 modifications, which are almost uniformly present in the Diory- 

 merini, the sexual characters being of the same nature as in the 

 majority of the subfamily, and this is another very important point 

 of difference between the two tribes Coleomerini and Diorymerini. 

 The above two species are undoubtedly very closely allied, but 

 appear to have become distinctly differentiated by reason of en- 

 vironmental conditions. 



Coleomerus Schon. 



The species are rather numerous in this genus, almost uniformly 

 deep black in color, shining and with deep and rather smooth 

 elytral striae or grooves and flat intervals. There is no essential 

 sexual difference in the abdomen, so far as known, this being 

 strongly and uniformly convex as a rule and finely, remotely and 

 sparsely punctulate, the first suture extremely fine, the last three 

 moderately coarse and abruptly refiexed and finer at the sides. 

 The head, with large, more or less approximate eyes, is very much 

 as in the Zygopinae. The species at hand are the following: 



Elytral grooves rather fine but sharply defined and deep 2 



Elytral grooves relatively very coarse and deep 5 



2 — Eyes separated by half the width of the beak or a little more 3 



Eyes separated by less than half the width of the beak in both sexes 4 



3 — Body larger in size, broadly oval, deep polished black throughout, nearly 

 smooth above, strongly and rather closely punctate beneath, finely and 

 sparsely on the abdomen; beak moderately thick, feebly arcuate, distinctly 

 though loosely sculptured, as long as the head and prothorax ( 9 ), a little 



