Mr. T. V- Wollaston on two new Plinthi. 19 
have not thought it worth while to destroy one of the examples 
of the P. velutinus in order to satisfy myself of a similar subanal 
contrivance in that species also. There can be no doubt, how- 
ever, that it would stridulate; though, judging from its less 
constricted or attenuated elytral apex, I should imagine that its 
notes would probably be less audible than those of its ally. 
Both the P. musicus and velutinus have strongly carinated pro- 
thoraces, and their femora have a powerful tooth beneath. 
Plinthus velutinus, un. sp. 
P. squamis atris densissime tectus, sed vix setulosus ; rostro ad basin 
(ante oculos) sat fortiter rotundato-ampliato ; prothorace inzequali, 
carinato, sed vix punctato; elytris ante apicem minus lateraliter 
constrictis, apice ipso integro, squamis albidioribus ad humeros 
ipsos, necnon aliis punctum minutum discalem et maculam vix 
majorem transversam postmediam efficientibus (omnibus plus 
minus obsoletis), ornatis, leviter striato-punctatis, interstitiis alter- 
nis obsolete elevatis; femoribus dentatis. 
Long. corp. lin. 6-6}. 
Habitat Teneriffam, in iisdem locis ac precedens, sed illo multo 
rarior. 
Nearly resembling the P. musicus; nevertheless its much 
darker surface and almost total freedom from additional decum- 
bent setz, as well as its nearly obsolete elytral patches (which, 
when not obliterated, are reduced to four small punctures, or 
spots), in conjunction with its slightly shorter and broader ros- 
trum (which is rather more distinctly widened at the base, im- 
mediately in front of the eyes), its nearly unpunctured prothorax, 
and the entire and less laterally constricted apex of its more 
feebly sculptured elytra, will readily distinguish it from that 
species. It is very much rarer than the P. musicus, occurring 
beneath stones in the moist woods of a lofty elevation; and 
although both species ascend to an altitude of at least 7000 feet 
above the sea, the P. velutinus would seem to inhabit principally 
the upper portion of that range, attaining its maximum, perhaps, 
at about the height of 6000 feet. Most of the specimens of it, 
however, which I have as yet secured were captured amongst 
the Retamas of the Cumbre, above the Agua Mansa; whereas 
the P. musicus is found, not only in that upland tract, but also 
at the Agua Mansa itself, and likewise in the sylvan districts of 
the Agua Garcia and towards Point Anaga, in the latter of which 
it is tolerably common at Las Mecedes (beyond Laguna) and 
above Taganana—making its appearance at an altitude of about 
2000 feet. 
Q* 
