238 { March, 
rather, his companion Villagomes) found the first specimen, and it was 
by dint of swimming from rock to rock in the cold, rapid waters that 
he succeeded in obtaining a good series of three of his species, besides 
two new Oxycheile. I had myself occasion to observe that some of the 
handsomest species of Odontocheila (a closely-allied genus) preferred 
the margins of shady streams. I never found O. Batesii except on 
aquatic plants and grasses, and only in the shade of the forest. 
As to the generic characters, they require some modification. The 
bi-spinose apices of the femora are not a constant feature; and the 
“elytra apice explanata, singulatim acute acuminata” of Mannerheim 
applies only to the males of some species. The labrum in none of the 
eight species in my own collection agrees with the definition originally 
given by Mannerheim, “ guinque dentatum, dentibus tribus mediis ap- 
proximatis, minutis, acutis ;” it is, however, as in Mannerheim’s typical 
species, always short and transverse; but in none, male or female, is 
there more than one central tooth ; this is always a little elevated, and 
sometimes projects as a longish spine, though in one species it is short 
and obtuse: beneath this central tooth, on each side, the fore margin 
is a little uneven, but there is nothing approaching the tridentate form, 
and no trace of an exterior tooth on each side ; the angles are rounded 
or truncate. The labrum offers no sexual differences. The mandibles 
are longer and have longer and stronger teeth than in Odontocheila, but 
the palpi afford probably the best structural means of distinction, the 
terminal and penultimate joints of the maxillary being much elongated 
and scarcely unequal in length; thus differing from Odontocheila, in 
which the penultimate is much abbreviated. The antepenultimate ven- 
tral segment in the ¢ is very deeply cleft in the middle, and the 
third segment strongly dilated posteriorly on each side. 
The following notes comprehend all the known species, of this rare 
and beautiful genus. 
Oxyeonta SCH@NHERRII. 
Mannerh., Bull. Mose., 1837, 11, 19. 
Mannerheim described this typical species from a single male taken 
near Antioquia in the valley of the Cauca, and therefore distant some 
500 miles of latitude from the locality of Mr. Buckley’s species. It is 
7 lines in length, obscure brassy, the elytra with the margin and suture 
narrowly bordered with green, and having three marginal spots, the 
humeral and apical oblong, and the middle one rounded. The colour of 
the labrum is not mentioned; the elytra are given as regularly and 
finely punctured, with their apices singly produced and acute. The 
