Peutarthrum.] RHYNCHOPIIORA. 391 



PENTARTHRTJ1VI, Wollaston. 



This genus contains three species, one from St. Helena, another 

 from Ascension Island, and a third which is found in England and 

 France on both sides of the English Channel ; they may be known by 

 the five-jointed funiculus of the antennae ; the rostrum is moderately 

 long and robust, not dilated at apex as in Cossonus, with the scrobes 

 deep and commencing in middle ; club of antennae small ; scutellum. 

 small but distinctly visible ; mesosternum rather broad. 



P. Huttoni, ATollaston. Eeddish brown, or pitchy, with the head 

 and thorax often darker than the elytra, rather shining, glabrous, 

 antennae and legs ferruginous; rostrum longer than the head, eyes 

 slightly prominent ; antennae \vith the funiculus five-jointed ; thorax 

 considerably longer than broad, narrowed in front and constricted before 

 apex, strongly punctured, less closely on disc than at sides, broadest 

 near base ; elytra cylindrical, with deep roughly punctured striae, which 

 are at least as broad as the interstices ; interstices punctured; tarsi 

 with the third joint bilobed. L. 2|-3j mm. 



Male with the rostrum thicker and plainly punctured at base. 



Female with the rostrum less thick, very shining, and almost 

 smooth. 



In damp and decaying wood, especially of casks, Ac.; very local; Plymouth 

 (J. H. Keys); Portsmouth district (H. Honcreatf) ;* Portland; it has also been 

 recorded from Alphington (Devon) and Plymouth in dead cherry wood. 



COSSONUS, Clairville. 



This is a large and important genus containing upwards of a hundred 

 species, of which three only occur in Europe } and one in Britain ; the 

 remainder are very widely distributed, but are chiefly found in tropical 

 countries ; they may be known by having the rostrum furnished with a 

 depressed triangular dilatation at apex ; the antennae are inserted in 

 front of the middle of the rostrum in both sexes and the scrobes com- 

 mence considerably in front ; the club of the antennae is large ; the 

 eyes are subrotundate ; the anterior coxse are plainly distant, and the 

 mesosternum is placed on the same level with the prostemum ; the 

 species are found in decaying wood. 



C. ferrugrineus, Clairv. (parallelopipediis, Herbst. ; linearly F. 



nee Boh. et Gyll.). Pitchy black or ferruginous, with the head and 

 thorax often darker than the elytra, which are depressed on disc ; 



* Mr. Moncreaff has sent me the following note on this species : " This rare species 

 I have found in numbers in a piece of spruce fir that at one time formed a portion of 

 a wine bin in a grocer's cellar at Southsea and which I had purchased for firewood ; 

 the larvae make oval burrows in the soft portions of the wood, aud with them I have 

 found several specimens of a parasite (Cerocephala formiciformis f)." 



