464 Coleopterological Notices, IV. 



invariably with a short acute internal pjiur at the apex. The tarsi 

 may be shorter or longer than the tibiae generally with the third 

 joint dilated and bilobed, but occasionally also with the second as 

 widely dilated as the third as in Barinus ; in Calandrinus, Zaglyptus, 

 Eunyssobia and Plocamus the tarsi are very slender, with the third 

 joint not or scarcely wider than the second, while in Barinus bivif- 

 tntiis they are extremely broad. The tarsal claws may be connate 

 or divergent, rarely single; in Centrinus senilis Gyll., they become 

 robust, and excavated along the under surface; they are never 

 toothed, cleft or appendiculate, this being as singularly constant a 

 peculiarity of the Barini, as the seven-jointed antennal funicle.^ 

 The structure of the abdomen is comparatively constant and of no 

 value in classification as far as can be observed ; the last three sutures 

 are always posteriorly reflexed at the sides. 



The secondary sexual characters of the male are numerous, varied 

 and often of a decidedly radical nature. In many species of the 

 genus Centrinus, for example, the male has a long corniform process 

 before each anterior coxa and a deep prosternal fossa, while the 

 female is devoid of the processes, and may not only have the pro- 

 sternum flat or with a very feeble sulcus, but the coxte also more 

 widely separated. In some species of Centrinus, as before remarked, 

 the basal joint of the antennal club is the only part subject to second- 

 ary sexual modification in the male. In conformity with a general 

 rule in the CurculionidsB, the antennae are usually inserted relatively 

 nearer the tip of the beak in the male than in the female, the beak 

 being nearly always smoother, somewhat longer, Mess punctate, more 

 ?lender and sometimes more strongly arcuate in the latter sex. 

 The abdomen generally has, near the base, a small, moderately deep 

 impression, as in many tribes not only of this but of other families. 

 Finallv, among the more special and singular secondary male cha- 

 racters, mention should be made of the dentate anterior trochanters 

 of Centrinus acuminatus and globifer, and of a very remarkable 

 structure which I have noticed in an undetermined Brazilian species, 

 the sides of the prothorax behind the apex having a large impres- 



1 As a most notable exception, it should be stated that in the genus Enops 

 of Pascoe, the claws are described as bifid ; but the author appears to be in 

 some doubt as to the true affinities of Enops, and it is quite possible that it 

 will have to be referred to another tribe. 



2 In Conoproctus there is an extraordinary reversion of this rule, the beak 

 in some species being much longer in the male than in the female. 



