242 
REVISION OF THE BUl’RESTIDJE OF THE UNITED STATES. 
having antennal grooves on the sides of the thorax; and there appears to be no reason 
why the present species should not be placed in Coroebus. The prosternum is not lobed, 
but truncate anteriorly. C. caliginosus Lap. seems to be merely the common Euro¬ 
pean C. r u b i, with an erroneous locality. 
Agrilus Sober. 
The species of this genus are numerous, and quite difficult to distinguish, and I am not 
without fear that in some cases with more abundant material for examination I may be 
found to have made errors. I have, however, endeavoured to prevent any ambiguity in 
identifying such forms as I have had before me, by calling particular attention to those 
characters in which they differ from those most closely allied. 
According to the form of the ungues, our species constitute two large groups, to a cer¬ 
tain extent parallel with each other, and in which species occur strongly resembling those 
of the opposite series. 
A. Ungues fere fissi, basi sub-connati, partibus iuternis arcuatis, apice contiguis. 
* a. Elytra atra, subtilius confertissime granulata; capit thoraxque euprea - - Sp. 1—3. 
* * Elytra plus minusve metallica, minus subtilitcr granulato-punetata. 
b. Frons subconvexa, subglabra ....... Sp. 4 — 9. 
c. Frons planissima pubcscens (elytra fere seriatim punctata.) .... Sp. 10. 
B. Ungues vel acute vel praecipuc late dentati, dentibus apice baud contiguis. 
* d. Thorax lateribus dense pubescentibus; elytra subtilissime granulata - - Sp. 11. 
* * Thorax pube baud vittatus. 
e. Elytra impressionibus pubescentibus ornatis ..... Sp. 12—17. 
f. Elytra impressionibus pubescentibus nullis Sp. 18 — 32. 
(Elytra densius granulato-punetata: 
Scutellum cariuatum ....... Sp. 18 — 22. 
Scutellum planum ....... Sp. 23. 
Elytra fortius granulato-punetata: Sp. 24 — 32.) 
A—a. 
1. A. fuscipennis, capitc valde excavato, thoraceque cupreis, hoc vittis duabus pupurcis, valde canalicu¬ 
late, utrinque late excavato, elytris atris, subtus nigro-Eenea. Long. -47—-51. 
Gory, Mon. Bupr. 4, 238, tab. 29, f. 230. 
Southern and Western States: the largest of our species. 
2. A. a r c u a t u s, fronte baud canaliculata, capite postice excavato, thoraceque cupreis, hoc fortius rugose 
punctata, antice transversim, postice et utrinque oblique valde impresso, angulis posticis obtuse carinatis, elytris 
atris, subtus nigro-aenca. Long. -25. 
Say, Trans. Am. Phil. Soc. 6, 102. 
