338 SUPPLEMENT. 
The head in this species is narrower than the thorax ; red, but pitchy or leaden as far 
as it is inserted in the thorax; very finely and indistinctly punctured. Thorax entirely 
orange-red, scarcely visibly punctured, the sides very little widened. Elytra leaden 
grey, with a fine silky pubescence, which is pruinose (like that in Colyphus limbatus), 
the alternate interstices finely raised, the punctuation very fine, close, and confluent. 
Legs black, femora orange-red. Abdomen distinctly brassy ; metasternum bluish. 
A very distinct species, easily recognized by the short clubbed antenne and details 
mentioned. 
Two specimens only *. 
4. Pecilochroa frontalis. 
Aterrima, nitida; capite antice cum ore flavo, prothoracis lateribus aurantiaceis; elytris crebre fortiter punc- 
tatis. Long. 53 millim. 
Hab. GuatEMALa, near the city 5000 feet (Salvin). 
Entirely black, with the exception of the front of the head and the sides of the thorax ; 
antenne scarcely at all clubbed, as they are in P. thoracica (Clerus thoracicus, Oliv.) ; 
the yellow part of the front extending back beyond their insertion nearly to the base 
of the eyes; crown and disc of the thorax glabrous; the latter is shorter than in 
P. thoracica (which this species much resembles), and the anterior constriction is deeper, 
with the sides more bulged below it ; the black centre of the disc, moreover, is continued 
quite to the front edge, whereas in P. thoracica it is only united to the front by anarrow 
strip. Elytra more deeply punctured than in P. thoracica, and faintly substriate. 
One specimen. | 
P. thoracica, Oliv., which this species so much resembles, is found in various parts of 
the United States and in Canada. | 
THANASIMUS (p. 147). 
1 
4. Thanasimus 
Hab. Muxtco, Cerro de Plumas (Hége), Totosinapan (Sallé). 
There are two specimens of a Thanasimus which are not in a condition to render it 
desirable they should be described as new; they are allied to Clerus nigripes (which 
would itself be better transferred to this genus), but differ, however, from any of the 
varieties of that species known to me, infer alia, by having.a black abdomen. 
CLERUS (p. 148). 
Clerus sphegeus (p. 150). 
To the Mexican localities given, add :—Pinos Altos in Chihuahua (Buchan-Hepburn). 
One example. 
* The antennzx are represented too short in the figure. 
