426 EHYNCHOPHORA. [DryocveUiici. 



2. Elytra without scale-like pubescence, glabrous 

 or with outstanding hairs ; club of anteniuo 

 orbicular and compressed. 



A . Base of thorax finely bordered ; prosternum 

 with a short process ; size very small ; club 

 of antennae divided by three constricting 



sutures into four joints PITYOPHTHOBTJS, Eich. 



B. Base of thorax not bordered. 



a. Club of the antennae with the second joint 

 crescent-shaped and completely embracing 

 the sides of the first joint which is oval ; 

 scutelluin rudimentary ; elytra with re- 

 flexed portion dentate in the male, not 



dentate in the female XYLOCLEPTES, Ferr. 



b. Club of antennae with the second joint 

 variable in shape but not embracing the 



sides of the first joint; scutellum distinct. 



a*. Prosternum with a sharp and distinct 



angular process between the anterior 



coxae, 

 af. Elytra not excavate at apex which 



is applied to the abdomen. 

 a+. Club of antennae simple, orbicular, 

 with curved sutures, concave towards 

 apex ; mentum oblong-quadrate, 



sub-mentum invisible TAPHRORYCHUS, Eich. 



bj Club of antennae truncate at apex, 

 the basal joint being corneous and 

 the remaining oints lying within 

 it ; mentum broadly cordate, sub- 



mentuin large and concave anteriorly DRYOC-ETESj Eich. 

 bf. Elytra excavate at apex which is 

 horizontal or almost horizontal behind 



the apex of abdomen TOMICUS, Latr. 



b*. Prosternum without or with a very 

 short process between the anterior 



coxae. 



af. Tibise almost linear without furrows 

 for the reception of the tarsi ; apex of 

 elytra with large teeth in the male, 

 and with a strong impression on each 



side of suture in the female .... PITYOGENES, Bedel. 

 bf. Tibias dilated, furnished with fur- 

 rows for the reception of the tarsi ; 

 apex of elytra without large teeth or 

 deep impressions in the sexes . . . XYLEBORUS, Eich. 



Before Mr. Blandford pointed out to me further distinguishing cha- 

 racters I had included both Taplirorychus, Eichhoff, and Lymantor, 

 Lowendal, under Dryoccetes ; I had, however, thinking that others might 

 not be of the same opinion as myself, appended the extracts given below 

 from Bedel (Faune, Col. du Bassin de la Seine, p. 396) and from 

 Lowendal's table in the Entomologiske Meddelser-Andet. Bild. Forstc 

 Hefte. p. 8. The following is a portion of the table given by M. 

 Bedel : 



