42 RHYNCHOPHORA. 
one in front of, and another behind, the apical declivity ; fourth interstice with three 
short, very distant marks, the sixth with two short marks on the posterior portion, the 
eighth with a mark on the middle. Under surface shining; metarostrum regularly 
biseriately foveolate ; metasternum and abdomen not impressed. Base of hind femora 
compressed and lamelliform above. 2 
We have received only one specimen of this fine and interesting insect. 
HETEROBRENTHUS, gen. nov. 
Antenne mediocriter crasse et elongate, haud pubescentes. Rostrum maris supra omnino muticum, apice 
dilatato, antennarum insertione fere mediana. Caput angustum, utrinque post oculos tuberculatum, 
vertice emarginato, angulis posterioribus liberis. Femora anteriora dentata, intermedia et posteriora 
mutica. Tibie anteriores intus dentate. 
The species I separate under this name has perhaps more the appearance of a true 
Brenthus than of Rhaphirhynchus ; nevertheless its affinities appear to be chiefly with 
the latter genus and Adrentodes, from both of which it differs by the form of the male 
rostrum, by the unarmed middle and posterior femora, and by the want of setosity on 
the antenne. The shape of the head is peculiar, and is nearest to that of Psalobrenthus. 
There is, on the upperside, a well-marked constriction between the head and the neck, 
and the angles of the vertex project a little backwards over this, and are somewhat 
depressed ; the eyes are placed at some little distance from the back of the head, and 
behind them a small angular projection exists on each side. The metarostrum of the 
male is rather long, but the antenne are inserted distinctly behind the middle of the 
rostrum. On the underside the neck is very prominent, as in Mhaphirhynchus, but 
there is no true excision between it and the head. The structure of the breast and 
abdomen shows nothing remarkable, being much the same as in Rhaphirhynchus. 
1. Heterobrenthus distans, sp. n. (Tab. Il. figg. 9, 6; 9a, profile of the 
side of the head; 9%, tip of antenna.) 
Angustus, piceus ; elytris vage flavo-signatis, ad suturam profunde bistriatis, externe obsolete seriatim punc- 
tatis; tibiis anterioribus intus dentatis. 
Long. 10-19 millim. 
Hab. Mexico, Juquila (Sallé), Temax in North Yucatan (Gaumer); GUATEMALA, 
Panzos, El Reposo (Champion) ; Nicaragua, Chontales (Janson). 
Antenne rather long and stout, reaching back two-thirds of the length of the thorax, 
destitute of outstanding sete. Metarostrum of female moderately long, broad, deeply 
impressed. Eyesrather elongate. Vertex flat, placed above the eyes, on the middle with 
faint indications of an elevation; hind margin excised, hind angles prominent. Thorax 
elongate, smooth, moderately shining. Elytra with two deep striae near the suture, 
externally with only obsolete distant punctures serially arranged, piceous; third inter- 
stice red, the colour interrupted on the middle; a long red mark behind the shoulder, 
