356 MEMOIRS ON THE COLEOPTERA 



OCHR^ETHES Chev. This is a neotropical genus, no member of 

 which extends to northern Mexico; it has most of the characters 

 of Cyllene, including an equally strong subsutural carina on each 

 elytron, but differs greatly in the form and structure of the pro- 

 thorax, this being relatively much smaller and subcordate in out- 

 line. The various species are sometimes difficult to differentiate, 

 owing to the very dense and more or less confused coating of ochreous 

 pubescence. Perhaps our very isolated type of Arhopalus Serv., 

 resembles Ochrcethes in thoracic structure more closely than any 

 other species of the north temperate fauna. Ochrcethes is the name 

 of the genus as originally published by Chevrolat and should there- 

 fore be adopted, irrespective of correct etymology. It has been 

 printed since as Ochrcesthes, Ochrcesthes, Ochresthes and Ochrestes; so 

 it is better to adhere to the original spelling and avoid doubt. 



GLYCOBIUS Lee. The generic name given by LeConte to Clytus 

 speciosus Say, is eminently proper and should not be changed to 

 Plagionotus. No true member of that genus approaches speciosus 

 in its very broad tapering antennge, with almost symmetrically 

 emarginate joints, or in its peculiar scheme of ornamentation. 

 Speciosus is the most conspicuous and one of the most isolated 

 Clytids of the American fauna, and its special generic name Glycobius 

 should rightfully be restored and not merged into the very chaotic 

 mixture now known as Plagionotus. 



Calloides Lee. 



It does not seem to have been noted heretofore that the remark- 

 able differences in color and vestiture pertaining to various examples 

 of Clytus nobilis Say, are due entirely to sex. The discovery of this 

 fact renders the systematic treatment of the somewhat numerous 

 species a very easy matter. Besides the five species at present in 

 my collection and defined below, the Mexican Clytus (Plagionotus) 

 regalis of Chevrolat, must be included; it almost exactly resembles 

 biformis and muliebris, but has the sculpture of the pronotum much 

 more coarsely rugulose. The species known to me may be described 

 as follows: 



Legs relatively not stout; elytra never much less than twice as long as 

 wide in either sex and generally much more, sometimes a little shorter 

 in the male than in the female 2 



Legs very stout; elytra in the male barely three-fourths longer than wide, 

 crossed by a very feeble or barely traceable submedian impression . . 4 



