MADEIRAN COLEOPTERA, 29 
and widest a little behind the middle; coarsely punctate-striated, 
with scarcely any indications of pubescence (even beneath the 
microscope), and concolorous. Antenne and legs pale-testaceous, 
—the club of the former, and the extreme apex of the tarsi being 
dark. 
In a few specimens which I possess, the entire insect (except the 
limbs) is of a piceous, or brownish-black, hue; such examples, 
however, are both scarce and aberrant. 
The present Ochthebius is clearly the representative of the 
O. pygmeus of more northern latitudes,—exactly as the following 
one is that of the O. marinus. Both of them, however, possess so 
many characters, of form, sculpture and colour (if not indeed of 
structure likewise), which are essentially their own, that it is 
scarcely possible to regard them, however near the relation, as local 
modifications of their European allies. The O. rugulosus differs from 
the pygmeus in being rather larger, more brassy, and much more 
acuminated posteriorly; in its prothorax being altogether wider 
(especially in front) and with the lateral impression deeper and more 
curved; and in its head and prothorax being much more rugulose 
and granulated, with the forehead more depressed. The club of the 
antenn, likewise, is darker, as also more abrupt and obtuse, than is 
the case in that insect. The species was detected by myself in one 
of the streams in the north of Porto Santo, during April 1855, 
<- 
83. Ochthebius subpictus, n. sp. 
O. ovalis gracilis subenescens, capite prothoraceque viridescentibus 
necnon dense granulosis, hoc fovea magna brevi transversa lunu- 
lata in disco postico impresso, ad latera late membranaceo, elytris 
pallidioribus, punctato-striatis, subtiliter pubescentibus, obscu- 
rissime nigro-pictis. 
Long. corp. lin. 1-1}. 
O, a little more oval (as also smaller and slenderer) than the last 
species, likewise paler, somewhat less shining, and not so brassy. 
Head and prothorax very closely granulated, but with scarcely any 
punctures intermixed ; and of a more metallic tinge than the rest 
of the surface,—the depressions being generally of a greenish, and 
the elevations of a brassy hue: the former with a curved im- 
pression on either side of the forehead, between the eyes: the 
latter wide anteriorly, and more filled-out behind, with a mem- 
branous margin, than is the case in the O. rugulosus; with no 
appearance of a dorsal channel, but with a large, short, deep, 
transverse, lunulate depression on the centre of its hinder-, and 
a much shallower, obscurer and straightened one (of the same 
breadth) on its fore-disk ; also with very obscure indications of a 
curved and interrupted longitudinal costa, or raised line, on each 
