84 Memoirs on the Coleoptera 



The position of these species among the Brazilian forms may be 

 judged easily by the characters as given. They are doubtless allied 

 rather closely to Diorymerus quadristriatas , of Champion, but there 

 the scutellum is said to be transverse. 



The species described by Mr. Champion as Diorymerus erythro- 

 notus, constitutes another subgeneric group of Hiotus, which may 

 take the name Hiotidius (n. subgen.). It is distinguished by a 

 marked peculiarity of the tibiae, these being subtriangular in form, 

 the outer angle minutely subprominent. The beak is also longer 

 and thinner, and the first ventral feebly but abruptly flattened 

 medially. The anterior femora are peculiarly swollen basally. 

 The species Diorymerus punctatus Chmp., will also form part of 

 this subgeneric group. Of erythronotus , I have five specimens, 

 taken by Mr. Townsend at Frontera, in Tabasco — the original 

 locality. They vary in size to an unusual degree. The tarsal 

 claws are slender, arcuate, free and widely diverging. 



Tribe Coleomerini. 



A few generic groups forming this tribe, while allied in certain 

 features, such as the inferiorly sulcate femora, to the Diorymerini, 

 differ in some radical peculiarities. The most important of these 

 differences are the entire form of the body, which has the normal 

 convexity of the subfamily, not at all similar to the high vaulted 

 profile seen in all the Diorymerini, and the form of the pectoral 

 canal, which is not confined to the ante-coxal part of the prosternum, 

 as in that tribe, but extends posteriorly into the mestasternum, 

 except in Cryptobaris, forming a closed receptacle for the beak 

 when retracted, somewhat as in the Ccelonertini, which follow, and 

 in the subfamily Cryptorhynchinse, except that in the Coleomerini 

 the channel posteriorly, though sharply defined, is notably shallow. 

 The floor of this canal is made up of a rather complex arrangement 

 of the sclerites, the sutures all distinct. The body is briefly oval, 

 generally — but not always — glabrous, the sculpture usually feeble 

 and sparse though sometimes dense and conspicuous. The man- 

 dibles are always prominent, straight and attenuated, and come 

 together on a perfectly straight line, as in typical Centrinini. The 

 tarsal claws are always slender, arcuate, free and divergent. 



The five following genera are founded upon peculiarities of the 

 antennal club, form of the hind femora, sculpture, relative degree 

 of separation of the eyes and some other differential features: 



Eyes more or less approximate above 2 



Eyes well separated ; femora not at all inflated 4 



2 — Antennal club larger, nearly as long as the preceding six joints, ovoidal, 

 asymmetric and solid, the sutures very fine and indistinct; hind femora not 

 inflated; eyes separated above by a little more than half the width of the 



