106 LONGICORNIA. 
other two species they are nearly parallel at first for a short distance and do not 
diminish again in width till shortly before the apex. The consequence of this diffe- 
rence in the curvature of the sides is that the greatest width of the elytra falls a little 
nearer the middle in P. albisetosa than it does in the allied species. Together with 
this difference of form, there is a distinguishing character in the clothing of the surface, 
furnished by the small pencils of short white bristles, which are conspicuous in P. albi- 
setosa but are not noticeable in the other two species. 
ADETUS. — 
Adetus, Leconte, Journ. Ac. Nat. Sci. Phil. ser. 2, ii. p. 161 (1852). 
Agennopsis, Thomson, Arch. Ent. i. p. 802 (1857). 
Talepora, Fairmaire, Ann. Soc. Ent. Fr. 1859, p. 521. 
Tautoclines, Thomson, Physis, 1. p. 155 (1868). 
Distinguished from Parmenonta, to which it is very closely allied, by the metasternum 
being of normal length. The species have no longer any resemblance in form to Par- 
mena and the Dorcadionini. Including Zautoclines (admitted, with some reservation, by 
Lacordaire, but which possesses no points of difference applicable to the extensive 
series of species now known), the genus is a large one, including more than a score 
of species, all peculiar to America and ranging from Chili in the south to Mexico in 
the north. A. analis, recorded from Pennsylvania, is said by Leconte to be a South- 
American insect. The species of Central America are numerous, and varied in form 
and markings. | 
1. Adetus muticus. (Tab. VIII. fig. 4.) 
Agennopsis mutica, Thomson, Arch. Ent. i. p. 802 (1857). 
Agennopsis pygea, Bates, Ann. & Mag. Nat. Hist. ser. 3, xvii. p. 295 (1866). 
Agennopsis mexicanus, Thomson, Physis, ii. 153 (1868) *. 
Adetus muticus, Bates, Trans. Ent. Soc. 1872, p. 234’. 
Hab. Mexico!; Guatemata, San Gerénimo (Champion); Nicaragua, Chontales 
(Belt ).—Souta AMERICA, Cayenne to South Brazil. 
2. Adetus costicollis. (Tab. VIII. fig. 5.) 
Adetus costicollis, Bates, Trans. Ent. Soc. 1872, p. 199°. 
Hab. NrcarAcua, Chontales (Bel¢ 1). 
The mesosternal prominence is less advanced than in A. muticus, and is strongly 
sulcated in the middle. 
3, Adetus griseicauda. | 
Tautoclines griseicauda, Bates, Trans. Ent. Soc. 1872, p. 199°. 
Hab. Nicaragua, Chontales (Bel¢ 1). 
