CERAMBYCIDAE. 291 



Our genera may be grouped as lullows: — 



Palpi with last joint broadly triangular. Poecilobrium. 



Palpi slightly dilated ; tarsi tumid. Eumichtlius, 



Palpi not dilated, last joint cylindrical ; 

 Eyes coarsely granulated ; 



Prothorax much narrowed behind. Phyton. 



Prothorax equally narrowed before and behind, tuberculate at the 

 sides. Obrium. 



Eyes very finely granulated ; prothorax with dorsal and lateral tubei cl<-s ; 

 Punctures fine, flying hairs sparse. Hybodera. 



Punctures coarse, flying hairs long, numerous. 



Mesosternum wide. Callinius. 



Mesosternuni narrow. Megobrium. 



Pcecilobrium Horn, is founded on CaUimus chalybeus Lee, a 

 small highly polished blue si)ecies from California, with the elytra 

 sparsely punctured, and the front thighs sometimes yellow. 



Phyton contains (Jallidium pallidum Say, from the Atlantic 

 States. Obrium has two species in the Atlantic States. 



Eumichlhus aedipus Lee, is a small species from Vancouver, 

 daik brown, finely punctured and pubescent, with two narrow 

 cinereous elytral bands, between which the color is darker. The 

 first two joints of the tarsi are swollen. 



Hybodera tuberculala, from California and Vancouver, of brown 

 color, with a large basal patch, and posterior transverse band of 

 pale sericeous pubescence. Besides the sculpture, it differs from 

 Cartallum by the prothorax having four discoidal tubercles, and 

 a smaller medial one. 



Callinius contains two species from California. They resemble 

 very much the European Cartallum ebulinuni, but apart from the 

 specific differences in color they have the last joint of the palpi 

 quite cylindrical, and the mesosternum very wide. They con- 

 stituted Pilema Lee, which, according to Bates, does not differ 

 from the European Callimus. 



Mr</obrium Hdivardnii Lee. is a Californian species, 12 niin. 

 long, of a testaceous color, with the punctures of the elytra sparse, 

 arranged in rows near the base, obsolete behind the middle. 



Lacordaire mentions that the front coxal cavities of Callimus 

 are not angulated externally; on examination they seem quite as 

 much so as in the other genera of this group, though the eoxal 

 fissure is not as widely open as in the next tribe. 



