80 LONGICORNIA. 
JETHECERUS. 
Aithecerus, Chevrolat, Ann. Soc. Ent. Fr. 1862, p. 532. 
Two species only are known of this distinct and beautiful North-American genus, 
one of which extends its range to Mexico. 
1. Aithecerus wilsoni. 
Arhopalus Wilsonii, Horn, Proc. Acad. Phil. xii. 1860, p. 570, t. 8. f. 4°. 
Aithecerus Wilsonii, Lacordaire, Gen. Col. ix. p. 183, nota; id. Atlas, t. 94. f. 5. 
Aithecerus Wilsoni, Chevrolat, Ann. Soc. Ent. Fr. 1862, p. 583 °*. 
Hab. Nort America, Texas !1.—MExico ?. 
OXOPLUS. 
Oxoplus, Leconte, Proc. Ac. Phil. xiv. 1862, p. 41; Lacordaire, Gen. Col. ix. p. 179. 
According to Lacordaire’s description, this genus is distinguished from its allies 
by the relatively short hind femora and tarsi, and the somewhat elongated scutellum. 
These features are passed under silence by Leconte; and the species he includes seem 
to resemble much in colour those of the genus Metaleptus. Four species have been 
described—three from Lower California and New Mexico, and one from Southern 
Mexico; a fifth is here added from the last-named region. 
1. Oxoplus ornaticollis. 
Oxoplus ornaticollis, Lacordaire, Gen. Col. ix. p. 180, nota; id. Atlas, t. 94. f. 4. 
Hab. Mexico, Oaxaca. 
2. Oxoplus pecilus. 
Elongatus, fere cylindricus, subtus dense fulvo-pubescens, capite nigro, thorace fulvo maculis quinque nigris; 
scutello modice elongato, apice attenuato, nigro; elytris fulvis, fascia subbasali antice utrinque ad humerum 
curvata latera haud attingente trienteque apicali nigris ; antennis pedibusque nigris. 
Long. 103 lin. 
Hab. Mexico, Tehuantepec (Sumichrast). 
Much resembling the figure given by Lacordaire of his 0. ornaticollis, but differing 
in the much less prominent thoracic tubercles, the broader scutellum, and the black 
marks of the thorax, these latter consisting (instead of three vitte) of five spots, two in 
a line on each side and one near the base in the middle. The under surface is densely 
clothed with long silky pubescence of a golden-tawny hue, the episterna of the meso- 
thorax being black. The elytra are very closely punctured, coarsely at the base, 
more minutely towards the apex; and there are two faint elevated lines down the 
middle of each. | 
