REVISION OF THE ISUPRESTIDvE OF TIIE UNITED STATES. 
241 
on the sternum densely punctured. The last ventral segment is broadly truncate with 
the angles prominent, and armed on the side with a tooth. 
2. A. acornis, supra atra, vix amescens, thorace confertim rugose punctato, transvcrsim impresso, lateribus 
vix rotundatis fere parallelis, elytris dense fortiter scabro-rugosis, iinpressionibus vagis inaequalibus, serratis apice 
conjunctim subrotuudatis; subtus nigro-acnea, vel cyanea nitida, punctata, stcrno saepe cuprascentc dense punctato. 
Long. -4—47. 
Buprestis acornis Say, Trans. Am. Phil. Soc. 6, 159. 
Chrysobotliris punctata Mels. Proc. Acad. Nat. Sc. 2, 147. 
New York, Georgia, Mexico. The head in one specimen is tinged with green; the 
under surface varies greatly in colour, being either bronzed, black-bronzed, or dark blue. 
In five specimens before me the last ventral segment is truncate, with prominent angles; 
and has the lateral tooth strongly marked. The eyes approximate closely on the occiput. 
GROUP VI. 
In this group are species mostly of a linear form, having the antennae inserted in 
large cavities, by which the epistoma is very much narrowed behind; it is usually broadly 
emarginate in front. The anterior part of the head is vertical, and the mouth is applied 
to the prosternum. The mentum is large, triangular and entirely corneous. The pro¬ 
sternum is broad, cuneate behind, scarcely angulated on the sides: the mesosternum 
usually moderate in size, completely divided. The scutellum in our species is transverse, 
acuminate behind, and usually transversely carinate, but in some foreign genera it is sim¬ 
ply triangular. Each elytron is rounded or subangulated at base, so as to enter the base 
of the thorax, which thus becomes lobed. The tarsi are long, or moderate, and the un¬ 
gues are strongly toothed. But two genera are found in the United States, to be dis¬ 
tinguished by the form of the tarsi. 
Tarsi postici articulo 1 mo vix longiore - - - - - - Coraebus. 
Tarsi postici articulo lmo sequentibus 3 mquali - - - - - Agrilus. 
Coraebus Lap. (emend. Lac.) 
1. C. cogitans, capite valde excavato, tlioracequc obscure cupreis, hoc dense puDctato, utriuque irregulariter 
maximc excavato, lateribus nigro-marginatis, elytris atris granulatis, fascia ad dodrantem alteraque subapicali ob¬ 
solete cinerco-pubesccntibus, subtus ameoniger. Loug. -32—-37. 
Buprestis cogitans Weber, Obs. Ent. 75. 
Buprestis ignara Fabr. Syst. El. 2, 211. 
Agrilus cogitans Say, Trans. Am. Phil. Soc. 6, 104. 
Humerus ignarus Laporte & Gory, Mon. Bupr. 2, 4, tab. 1, f. 5. 
Rhscboscelis cogitans Lee. Ent. Writings of Say, 2, 598. 
Middle, Southern and Western States. Lacordaire has restricted Rhceboscelis to species 
