REVISION OF THE BUPRESTIOvE OF THE UNITED STATES. 
1S9 
GROUP I. 
This group is distinguished by the prosternum being obtusely angulated on the sides 
behind the coxae, and then obtusely acuminate: the mcntum is entirely corneous: the 
front is not lobed, the antennal cavities are variable in size: the antennae have the pores 
diffused on the lower portion of the sides, but varying greatly in the space they occupy. 
The mesosternum is closely connate with the metasternum, and is broadly divided. The 
scutellum is small and rounded, sometimes not conspicuous: the tarsi are lobed beneath, 
and the first joint is elongated in two of our genera, and short in the third. 
Antenna) sub carina majuscula inserta); mentum late rotundatum - - Gyascutus. 
Antenna) in foveis parvis inserts); mentum late emarginatum - - Chalcophora. 
Antenna) in foveis majusculis inserta); mentum late rotundatum - - Psiloptera. 
Gyascutus Lee. 
Antenna) distantes sub carina obliqua elevata inserta), articulo lino conico paulo crassiore, 2 et 3 cylindricis, 
4to triangulari Bio baud breviore, margine inferiore poroso, 5—10 sensim paulo brevioribus, infra medium poro¬ 
sis; llmo apice lobato. Fossula) antennalcs niagnse profunda). Labrum emarginatum. Mandibula) valde 
obtusa); palpi maxillares haud dilatati. Mentum breve corncum antice late rotundatum. Prosternum lateribus 
postice angulatum, medio obtusum; mesosternum inetasterno integro connatum, sutura obliqua, late divisum. Pe¬ 
des graciles, tarsi subtus lobati, postici plerisque compressi articulo lmo elongato. 
This genus seems most related to Pelecopselaphus, which it resembles in form as well 
as in the narrow compressed posterior tarsi of some of the species: but it differs from that 
as from every other genus I have seen, by the elevated ridges above the antennas. 
The tip of the abdomen in both sexes has a transverse elevated line near the margin, 
which in the female is less distinct than in the male: in the latter the line is acute, and 
forms an acute tooth each side, thus causing the posterior outline to be distinctly sinuous, 
while in the female it is broadly subtruncate: the inferior anal plate is in the male pro¬ 
longed in the middle, forming an acute process, which, however, is usually concealed from 
view. The sides of the elytra are feebly serrate behind the middle. Our species form 
two groups; the antennal pores in the second are more numerous, covering nearly the 
whole of the sides of the articulations, and the basal joint of the posterior tarsi is less 
elongated, and less compressed. 
a. Epistoma late emarginatum: tarsi postici articulo 1 mo sequentibus duobus (equali. 
1. G. planicosta. Chalcophora planicosta Lee. Proceedings Acad. Nat. Sc., 1858, GG. Tab. XII. fig. 1. 
2. G. ob literatus. Chalcophora oblilerata Lee. ibid. 
These two species were collected by Dr. Tlios. II. Webb, on a journey from El Paso to 
