MADEIRAN COLEOPTERA. 3 
abundantly in the former, from about 2000 feet above the sea to the 
extreme summits of the mountains; and on the highest peaks of the 
latter, where it assumes a large, pale, and exceedingly well-marked 
variety. 
29. Olisthopus acutangulus, n. sp. 
O. ovatus subconyexus nigro-fuscus eenescens, prothorace rotundato, 
elytris profunde striatis, ad humeros acutioribus, singulo punctis 
tribus impresso, interstitiis distinctius subgranulatis, margine et 
sutura vix pallidioribus, antennis pedibusque infuscatis, 
Long. corp. lin. 3. 
O. similar to the O. Maderensis, but altogether darker, and with the 
elytra much more coarsely alutaccous (and therefore less shining). 
Head and prothorax, also, just perceptibly narrower; the elytra 
much more deeply striated, and with their shoulders more acute ; 
and the limbs considerably darker,—the antenne and palpi being 
infuscated-ferruginous, and the legs infuscated-testaceous. 
The above addition to our fauna has been lately communicated by 
Mr. Bewicke, and was discovered in the south of Madeira proper by 
Mr. M. Park. It is particularly interesting as approaching, in its 
deeply-striated elytra and acute humeral angles, the Canarian O. gla- 
bratus; and as affording therefore strong presumptive evidence that 
the nearly-allied forms, glabratus, acutangulus, Maderensis and Erice, 
are no local modifications of each other, but true (though, as it were, 
consecutive) species of a well-defined geographical type. The speci- 
men in the British Museum was presented by Mr. Bewicke. 
30. Olisthopus Ericz. 
Olisthopus Erice, Woll., Ins. Mad. 37. tab. 1. f. 8 (1854). 
Inhabits the mountains of Madeira proper, ranging from about the 
agree. Since that volume was published, however, I have received a specimen 
from Prof. Heer of Zurich, which was collected by M. Hartung in Lancerota, and 
which I have not the slightest doubt whatsoever is Brullé’s insect ; and after 
a careful comparison of it with the Madeiran one, I am inclined to consider 
it as undoubtedly distinct. There is no question that the two approach each 
other very closely; and I would regard them therefore as nearly-related species of 
a somewhat local type. The Canarian representative may be known from all the 
varieties of the Madeiran one, by the shoulders of its elytra beg much more 
produced forwards, and terminating in an exceedingly well-defined angle : the 
rim, also, at that particular part, is considerably more thickened, oy elevated, 
than is the case in its Madeiran ally. The elytra of the O. glabratus are, like- 
wise, a trifle less convex and more parallel at the sides, as well as a little more 
deeply striated, than those of the O. Maderensis ; they are also more shining, 
being free from the minutely subgranulose or alutaceous sculpture, which 
(beneath the microscope) is so evident in that insect ; and in the single example 
now before me, there is scarcely any indication of paleness along the suture, and 
the dorsal impressions (so conspicuous in the Madeiran representative) are 
excessively minute. 
