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Genus IV. — Phloeotrupes, Erichs. The funiculus of the antennae six- 

 jointed, the knob quadriannulate, orbiculate and compressed. The tibiae externally 

 convex, muricate, and internally concave. This contains two Brazilian species, both 

 new. 



Genus V. — Phloeoborus, Erichs. The funiculus of the antennae six-jointed, 

 the knob quadriannulate, oblong, acuminate. The tibiae compressed externally, 

 denticulated. Contains three Brazilian species, all new. 



Genus VI. — Hylesinus, Fab. The funiculus of the antennae seven-jointed, 

 the knob quadriannulate, oblong, acuminate. The apex of the tibiae compressed 

 externally, denticulate. The type is the H. crenatus of Fabricius. 



Genus VII — Phloeotribus, Latr. The antennae inserted in the front of 

 the face, the funiculus five-jointed, the clava trilamellate. The tibiae compressed, 

 externally denticulated. The type and only known species is the P. Olece, Lat. 



Genus VIII Diamerus, Erichs. The funiculus of the antennae six- 

 jointed, the knob solid, suboval, compressed. The tibiae compressed, externally 

 obsoletely denticulated. The only species known is the Hylesinus hispidus, 

 Klug, from Madagascar. 



Genus IX. — Polygraph us, Erichs. The funiculus of the antennae four- 

 jointed, the knob solid, suboval, acuminate. The tibiae externallydenticulated. 

 Comprising also but one species, the Hylesinus pubescens, Fab. 



Genus X. — Eccoptogoster, Herbst. The funiculus of the antennae six- 

 jointed, the knob solid, compressed, suboval. The tibiae compressed, entire, with 

 the apex uncinate. Here range 1. E. destructor, Oliv., which lives in the Birch ; 

 2. E. scolytus, Herbst., which is destructive to Elms ;* 3. E. pygmceus, Fab. ; 



4. E. intricatus, Koch., which is the E. pygmceus of Gyllenhal : it lives in Oaks ; 



5. E. multistriatus, Marsham ; 6. E. minutus, Panz. 



Genus XL — Camptocerus, Lat. The funiculus of the antennae seven- 

 jointed, the knob solid, compressed, suborbiculate. The tibiae entire, their apex 

 uncinate. The species of this genus are confined to South America, and consist 

 of the following, described by Fabricius : — 1. Hylesinus asneipennis ; 2. Hyl.fas- 

 ciatus ; 3. Hyl. gibbus ; 4. Hyl. suturalis ; 5. Hyl. niger. 



* Some mistake appears to exist with regard to the species so destructive to the Elms 

 in the vicinity of the metropolis, which must be this, and not the E. destructor, as supposed 

 by our entomologists. The insect is committing ravages to a great extent, and unless 

 some timely check be devised, it is to be feared that, in the course of a few years, not a 

 single Elm will exist near London. The remedy already suggested is, that trees which 

 are found to be infected should be immediately cut down and barked ; and it is supposed 

 to be erroneous that only diseased trees are attacked : further observation has shewn that 

 it is the male which prepares the tree for the reception of the female by boring holes in 

 the bark. It has been supposed that the mortality occasioned in these trees was owing to 

 their striking the root into the blue London clay, and thus becoming poisoned ; but that 



this is incorrect is proved by young as well as old trees being subject to the calamity Ed. 



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