4 Memoirs on the Coleoptera 



Ambatini are made up of a few genera having an elongate-oval, 

 rather convex form of body, often recalling Cholus, variable form 

 of beak, decussate and apically bifid mandibles, dentate femora and 

 concealed pygidium in both sexes;, they seem to be much more 

 numerous and generically diversified in Central than in South 

 America, and I have only two species in the Brazilian material 

 collected by Mr. Smith. 



In the table of genera given below Peridinetellus Chmp., Ptera- 

 canthus Sch., and Drepanambates Jekel, are omitted, because of lack 

 of any representative material, and Psendambates Chmp., is referred 

 to the Optatini because of similarity in facies. It will be noted 

 that most of the genera are Central American : 



Anterior coxae contiguous 2 



Anterior coxae separated; beak cylindric, rather thick; tarsal claws — viewed 

 axially — connate or very approximate at base 6 



2 — Beak thick, feebly arcuate, compressed and strongly sculptured; antennae 

 inserted beyond the middle; claws arcuate and free. Central America. 

 [Type Am. solani Chmp.] Batames 



Beak more or less slender, more arcuate, cylindric and much less sculptured.. . .3 



3 — Elytra not carinulate laterally 4 



Elytra with intervals 7 and 8 costulate toward base 5 



4 — Claws straight, connate at base; antennae inserted beyond the middle of the 

 beak. Central America. [Type Am. melanops Chmp. .] Macrambates 



Claws arcuate and free; antennae inserted at about the middle of the beak; tibiae 

 pluricostulate; ornamentation circumambient. Amazon region. [Type A. 

 pictus Gyll.] • . Ambates 



Claws and general structure nearly as in Ambates, the beak cylindric, stouter, 

 the antennae at about the middle; body larger than in Ambates, with more 

 shining integuments; ornamentation more or less circumambient. Central 

 American region. [Type Ambates cretifer Pasc] Cholinambates 



Claws and general structure as in Ambates, the body less slender, with confused 

 and not circumambient ornamentation, the tibiae broader and not at all 

 costulate. Amazon region. [Type P. leopardinus nov.] Pycriambates 



5 — Antennae inserted slightly beyond the middle of the beak; prothorax trans- 

 verse, parallel, narrowed in front; elytra with peculiar ornamentation, the 

 general facies as in Cleridae. Central America. [Type Am. cleroides Chmp.] 



Anambates 



6 — Prothorax parallel, rapidly oblique at apex; elytral vestiture marmorate or 

 tessellate. Central and South America. [Type P. irroratus Fabr.] 



Peridinetus 



Prothorax conical; integuments more shining; elytral vestiture never marmorate. 

 Central America. [Type P. distinctus Pasc] Conophoria 



No representative of this tribal group, excepting the Peridinetides, 

 seems to be known south of the Amazon and its tributary streams. 



Batames n. gen. 



Besides the type named above, a considerable number of species 

 placed under Ambates by Mr. Champion, such as bisignatus Chev., 

 and pictipennis, duplicates and exclamationis Chmp., should be 



