162 DESCRIPTIONS OF AND OBSERVATIONS ON 



Var. B. Thorax colour of the elytra. 



The great indentation of the vertex distinguishes this species from 

 others of this country. Herbst's figure only tends to mislead, if indeed 

 it can be intended for this insect at all. It is too robust, the thorax is 

 not represented as indented, and the elytra are punctured in striae, with 

 large punctures. 



2. A. geminatus, Nob. A numerous species; the colour of the 

 head and thorax often resembling those of the preceding species, but 

 the acute, arcuated, elevated line at the posterior angles, is similar to 

 that of the linearis, F. of Austria, which it very much resembles. 



3. A. politus, Nob. Much like arcuatus, but a little more robust, 

 and of a brilliant colour. Like the other species its elytra are denti- 

 culated at tip. Having examined numerous specimens, I find that it 

 is not of a larger size than geminatus. 



4. A. arcuatus, Nob. A little larger than geminatus, and resem- 

 bling it in the character of the elevated line at the posterior thoracic 

 angles, but the antennae are much more slender and elongated. 



5. A. granulatus, Nob. This species has three hardly visible ful- 

 vous spots on the elytra ; one on the depressed base, one near the suture 

 before the middle, and one behind the middle, also near the suture. I 

 have a specimen in which these spots are not at all visible. 



The elevated line at the posterior angles of the thorax is short, but 

 very obvious. 



6. A. bilineatus, Weber, Nob. In my printed description an error 

 occurs. When describing the elytral vittae, instead of " extended to- 

 wards the tip, where it gradually approaches the scutel," I should have 

 said suture instead of "scutel." 



7. A. lateralis, Nob. I stated in the description that the elytra are 

 entire ; I would add that they are not obviously denticulated at tip. 



8. A.pusillus, Nob. The smallest North American species I have 

 yet seen. 



The above species of agrilus, excepting the first, I described in the 

 Journal Acad. Nat. Sc. and the Annals of the Lyceum of Nat. Hist, of 

 New York, under the genus Buprestis, to which most entomologists 

 yet refer their kindred species. 



