[24] 



COSSONUS, Clairv. 



1. C. corticota, Bjack ; thorax impressed behind ; rostrum with an indented 

 line between the eyes, and another on the middle of the rostrum. 

 Inhab. U. S. 



Curculio corticola, Melsh. Cata!. 



Body deep black, immaculate, punctured ; head, punctures minute and remots 

 upon the vertex and becoming larger and more dertse towaf ds the tip of the 

 rostrum ; a profoundly indented, dilated line between the eyes ; rostrum dila* 

 ted towards the tip, piceous : thorax with a transverse obtusely indented line 

 on the anterior sub mai'gin; punctures large separate pl'ofound orbicular .minute 

 upon the anterior margin and confluent upon the posterior and lateral margins t 

 middle of the base widely indented and with a carinate line in the indentation : 

 elytra profoundly striate, striae with large profound transverse punctures. 



Length, base of rostrum to tip of elytra more than three twentieths of an 

 inch. 



A species equally common in Missouri and Pennsylvania. I have observed it 

 ttf inhabit in considerable numbers under the loose bark of yellow Pine trees 

 in October. 



2.^C. plataleat Thorax impressed behind ; rostrum punctured ; thorax rather 

 short. 

 Inhab. U. S. 



iiTeafi punctured, a little indented transversely between the eyes ; rostrum 

 dilated towards the tip, punctured antennae piceous ,- thorax with the 

 punctures not very profound, distant, irregular ; a basal indentation, with a 

 slight, obtuse carina in the middle of the indentation ; rather short, much rou- 

 nded on the sides ; elytra, striae with large punctures ; tarsi obscure piceous. 



Length nearly one fourth of an inch. 



The thorax is proportionally shorter than that of the corticola, the punctures 

 are less deeply impressed, and the rostrum is not obviously indented longitudi- 

 nally. It varies in having the tibiae obscure piceous. 



DRYOPTHORUS. Schupp. 



D. corticalis. Thorax with dilated punctures; elytra with dilated striae. 



This is so much like D. lymexy Ion Fabr. that it is considered the same : buS 

 on comparing with my European specimens, I find it smaller and the punctures 

 of the head are obsolete, whereas in the European specimens they are large 

 and obvious. This is the Curculio corticalis, Payk. of Melsh. Catalogue. 



