CERAMBYCIDAE. 271 



is produced by rubbing the hind femora against the edge of the 

 elytra, a phenomenon of which the first record has been made by 

 Mr. C. V. Kiley.* 



Our species fall naturally into the following tribes: — 



Eyes strongly granulated ; 



I. Prothorax pluridentate on the side ; 



3d antennal joint very long. Ergatini. 



3d antennal joint moderate. Mallodontini. 



II. Prothorax parcidentate on the sides ; 

 Metathoracic epimera parallel ; 



Antennae filiform. Derobkachini. 



Antennae imbricate. Prionini. 



Metathoracic epimera narrowed beliind. Tragosomini. 



III. Eyes finely granulated. Solenopterini. 



Tribe I.— ERGATIXI. 



One species, Ergates spiculatus Lee. of large size (55-63 mm. 

 long), is not uncommon on the maritime Pacific slope and in New 

 Mexico. The tribe is easily known by the prothorax being much 

 broader in the male than in the female, and finel}^ punctured; 

 in the latter sex the sculi)ture is very coarse, and the small teeth 

 of the lateral margin longer and more acute. The head is small, 

 the eyes I'eniform and coarselj granulated; antennae 1 1 -jointed, . 

 slender, two-thirds the length of the body in the Z , about half 

 the length of the body in the 9, rough with elevated punctures, 

 with the 3d joint as long as the three following united ; porif- 

 erous spaces on the 3d joint small inconspicuous, on the under 

 surface near the distal end, gradually becoming larger, until the 

 outer joints become entirely poriferous, and irregularly reticulated 

 with fine elevated lines forming elongate cells, which are much 

 less distinct, and in fact hardly to be seen in the male. 



The generic characters are not sufficiently distinct from th(! 

 European species E. faber to warrant the retention of the genus 

 IVichooiemis proposed in the earliest description of this insect. 



Tribe II.— MALLODOiVTIlVI. 



This tribe contains also sp(!cies of very large size (one from 

 Florida is before us that is 61 mm. long), with the sides of the 



* Canadian Entomologist, iv. 139. 



