CERAMBYCIDAE. 2&1 



able ; middle coxal cavities open externally ; mesosternum some- 

 times wide and emarginate behind, sometimes triangular and 

 pointed, side pieces large ; nictasternuni with side pieces wider 

 than usual. Legs moderate in length, thighs generally strongly 

 clubbed, 1st joint of hind tarsi at least twice as long as the 2d. 

 Abdomen with ventral segments slightly diminishing in length, 

 5th, iu S, short, subemargitiate. 



The antennas, in %, are usually longer than the body, and 

 thicker at base than in 9 . Flying hairs are seen on the legs and 

 antennae, and frequently on the body. 



As in the Stenopteri, thei'e are mute and sonant genera, and 

 according to the sculpture of the mesonotum they may be arranged 

 as follows: — 



A. Mesonotum with a large, undivided, very finely striate stridulating 



surface. 

 Hind coxse not prominent, thighs slender. Gonocallus, 



Hind coxse very lu-ominent, thighs strongly clubbed ; nietasteriuim 

 with scent pores ; 

 Elytra with ivory lines. Physocnemum. 



Elytra uniform. Rhopalopus. 



Hind coxae not prominent ; metasternum without scent pores ; 



Prosternum broad or moderate, hind coxse inclosed by side pieces 

 and 1st ventral segment. Hylotrupes. 



Prosternum ' very narrow, pointed, hind coxae not inclosed; pro- 

 thorax rounded. Phymatodes. 



B. Mesonotum polished, with large scattered punctures ; 



Mesosternum broad, emarginate. Merium. 



Mesosternum obtusely triangular. Callidium. 



C. Mesonotum punctured and. pubescent at the sides, with a medial stri- 



dulating surface. Xylocrius. 



Gonocallus is established on C. collare Kirby (lepidum Lee), 

 a very anomalous species with slender thighs, and the % antenme 

 12-jointed. It is an annectent branch towards IStenosphenus and 

 Clytus. 



Semanotus does not appear in the above scheme, as the former 

 representative of the genus in our fauna, G. ligneum Fabr., ap- 

 pears to us more naturally placed as a section of Hylotrupes, 

 differing merely by the sternal pieces being less dilated. 



We have retained Merium Kirby, because the type J/. Proteus, 

 though agreeing with Callidium in the sculpture of the meso- 

 notum, differs essentially in the form of the mesosternum; the 



