152 Mr. Kirby on some new genera and species 



Plate V. Fig. 5. & c. 

 Long. Corp. Lin. 6. 



Habitat in America Septentrionali, ex statu Massachussets dicto 

 a D. Drake medico mihi benevole transmissus. 



Desc. Reliquis major. Corpus nigrum, vel piceo-nigrum, 

 glabrum, subnitidum. Caput excavato-punctatum : punctis sub- 

 confluentibus. Antennoe articulis intermediis rufescentibus. La- 

 bium subrhomboidale, postice profunde emarginatum. Prothorax 

 ( Plate Y,lBig, 6. c). subquadratus, variolosus, lacunosus, medio ob-* 

 soletius sed latius canaliculatus ; angulis posticis extantibus denti- 

 formibus, triangularibus, acutis ; anticis obtusioribus intus fovea 

 adjacente, postice item foveae duae majusculae, oblongae notandae. 

 Elytra subrugosa, lacunosa, variolosa. Abdomen segmento dorsali 

 penultimo utrinque tuberculo apice spiraculifero( Plate V. Fig. £?.), 

 quod etiam in reliquis speciebus obtinet sed minus conspicue. 



This species is larger than either of those described in the eighth 

 number of the Journal, and is sufficiently distinguished from 

 them by its channelled prothorax with very prominent angles. 

 The species which I then described as the original C, Castanece* 

 of Knochj and which was sent me under that name from America, 

 upon a comparison with his description and figure, which I have 

 since had an opportunity of consulting, I find to be quite a dis- 

 tinct species. I propose therefore calling it C. Harrisii^ from 

 Dr. T. Harris, who sent it me. Knoch says of his insect, " Tho- 

 rax pr ope basin latissimus,^^ whereas in C. Harrisii the protho- 

 rax is square (Plate V. Fig. 3. tf.) ; in C. Castanece, also the la- 

 bium is wider than long, but in the former it is nearly round. 

 In his the prothorax is covered with puncta, but in mine it is 

 partly levigated. The sculpture of the elytra also differs. C. 

 Castanece approaches much nearer to that which I have called 

 C. variolosusy (Plate V. Fig, 4) but it is larger, the prothorax 

 is wider posteriorly, and the notch of the labium is not near so 

 deep. We have therefore already four species of this remark- 

 able genus, which appears to belong exclusively to North America : 

 at least nothing similar seems to have been found in the vast col- 

 lections of S* American insects that have been sent to this country. 



* Plate V. Fig. 3. 



