128 LONGICORNIA. 
TRESTONIA. 
Trestonia, Buquet, Arcan. Nat. p. 45. 
Five or six species are known of this genus, confined, like the preceding, to Tropical 
America. 
1. Trestonia assulina. (Tab. IX. fig. 15.) 
Trestonia assulina, Bates, Trans. Ent. Soc. 1874, p. 226". 
Hab. Nicaracva, Chontales (Bel¢ +). 
Group HIPPOPSINI. 
Lacordaire’s “groupes” Hippopsides, Spalacopsides, and Ischiolonchides, combined, 
form a natural assemblage of forms closely allied to Onciderini, but distinguished by the 
contraction of the crown of the head and the deflection of the lower part (with the mouth) 
downwards and backwards towards the prosternum—a peculiarity which is carried to an 
extreme in some of the genera, such as Spalacopsis, one of the most eccentric forms in 
the whole of the Longicornia. The less-specialized genera, such as Dorcasta and Bebelis, 
connect the group with the Ataxiini. Hippopsini are equally well represented in 
the Eastern and Western hemispheres, but they are most numerous in South-eastern 
Asia and its islands (including the Philippines) and in Tropical America, a few only 
being found in Africa, Tropical and Southern, and in temperate latitudes of America 
and Asia. One genus, Calamobdius, occurs in Southern Europe. 
HIPPOPSIS. 
Hippopsis, Serville, Encycl. Méth. Ins. x. p. 336; id. Ann. Soc. Ent. Fr. 1835, p. 41. 
Ten species have been described, from Tropical and Temperate America and from 
Tropical Asia and Africa. 
1. Hippopsis lineolata. (Tab. IX. fig. 18.) 
Hippopsis lineolata, Serville, Encycl. Méth. Ins. x. pp. 42, 336; id. Ann. Soc. Ent. Fr. 1835, p. 42, 
nota’; Bates, Trans. Ent. Soc. 1872, p. 2027. 
Hab. Mexico; Guatemana, San Gerénimo (Champion); Nicaracua, Chontales (Belé?, 
Janson).—SovutH AMERICA, Brazil 1. 
The comparison of a large series of specimens from North America (Texas), Central 
America, and South Brazil has led me to the conclusion that there is no valid difference 
between this species and H. lemniscata (Fab.) from the United States. The apex of the 
elytra varies in one and the same locality as to the amount of its prolongation ; and it was 
only the silence of Fabricius as to there being any pointed prolongation in H. lemniscata 
