64 J RHYNCHOPHORA. 
BRENTHUS. 
Brentus, Fabricius, Mant. Ins. i. p. 95 (1787). 
Brenthus, Schinherr, Gen. Cure. i. p. 342; Lacordaire, Gen. Col. vii. p. 442. 
This genus includes twenty-five species; it is one of the most characteristic genera of 
the Coleoptera of the Neotropical region. 
In the collection of Mexican insects formed by M. Sallé there exists a specimen 
obtained from Sturm’s collection and labelled by him “ Brenthus sub-bisulcatus, mihi, 
Mexico.” ‘This is a species of the Madagascar genus Piazocnemis, or rather, perhaps, 
of a genus closely allied to Piazocnemis. As I feel sure it was labelled as Mexican 
by some error, I have not included the species in our descriptions, though it appears to 
be undescribed ; it has the scape of the antenne unusually long. 
§ 1. Prothorax sulcate along the middle, either on the basal half only or for the 
greater part of the length. 
1. Brenthus deplanatus. 
Brentus caudatus, Oliv. Ent. v. no. 84, p. 440, t. 2. fig. 10 (1807) * (nec Herbst). 
Brenthus caudatus, Gyll. in Schénh. Gen. Cure. 1. p. 343°. 
Brenthus deplanatus, Gyll. in Schénh. Gen. Cure. v. p. 528°. 
Hab. Mexico 3, Orizaba (Sallé), Cerro de Plumas (Hoge); Guatemana, Cerro Zunil 
(Champion), Panzos (Conradt); Nicaracua, Chontales (Belt, Janson); Panama, Bugaba, 
Volcan de Chiriqui (Champion).—Soutu America, Surinam ! 2°, Brazil °. 
This varies greatly in size, but not very much in other respects. The elytral caude 
are not sexual in B. deplanatus; they vary in length according to the size of the 
individual, and in large females are nearly or quite as long as in the males of the same 
size. We have received a series of about seventy examples. 
2. Brenthus armiger. 
Brentus armiger, Herbst, Kafer, vii. p. 196, t. 108. fig. 5°. 
Brentus canaliculatus, Fabr. Syst. Eleuth. ii. p. 551°. 
Brenthus canaliculatus, Schénh. Gen. Cure. i. p. 346°. 
Hab. Mexico, Ventanas, Presidio (Forrer), Orizaba, Toxpam, Playa Vicente (Sad/é), 
Cordova, Bobo, Cerro de Plumas (Hége); British Honpuras, Belize, R. Sarstoon 
(Blancaneauxr); GUATEMALA, San Juan in Vera Paz, Mirandilla, Cerro Zunil (Champion), 
Coban (Conradt, Champion); Nicaracua, Chontales (Belt, Janson); Panama, Bugaba, 
Volcan de Chiriqui (Champion).—Sovutn America® to Brazil °. 
The yellow marks on the elytra are variable in this species, and may be completely 
absent. The elytral caude in the male vary greatly in their length ; they are never 
present in the female. In the latter sex the yellow marks are not nearly so variable 
