INSECTA MADERENSIA. 67 



A very distinct little species, and readily known from the remainder by its com- 

 paratively subcordate protborax, wbicb has the hinder angles prodviced into a 

 minute point, and by its diluted, cloudy surface, — the darker portions shading off 

 so gradually, and yet so unequally, into the lighter ones as to give the insect 

 somewhat the appearance of tortoiseshell. It is more deeply striated than any of 

 the rest, and the impressed points on its elytra are usually larger and more 

 apparent. It is generally taken in company with the T. flavomarginatus, which 

 at first sight it slightly resembles. It is however by far the rarer of the two, and 

 occm's in lofty rather than in intermediate altitudes. My specimens are princi- 

 pally from the Lombo dos Pecegueii'os, the Cruzinhas, the Lombo das Vacas, and 

 the Fanal. 



B. Eh/tra, suturd ohscurissimd excepta, concoloria. 



50. Trechus iimbricola, Woll. (Tab. II. fig. 3.) 



T. oblongo-ovatus subconvexus nigro-piceus, prothorace subquadrato basi utrinque profunde impresso 

 angulis posticis subrectis, elytiis striatis, antennis pedibusque pallidis. 

 Var. |3. paulo minor et interdum picescentior, elytris profuudius striatis. 

 Long. Corp. lin. 2|-2§. 



Habitat Maderam borealem sylvaticam, sub lapidibus truncisque arborum prolapsis, a 3000' s. m. 

 usque ad 5000' prsedominans : ad Lombo dos Pecegueiros abundat, qua mense Julio a.d. 1850 

 sat copiose collegi. 



T. oblong-ovate, rather convex, shining, and piceous-black ; when immature more or less ferruginous. 

 Prothorax subquadrate ; the posterior angles a little thickened, and nearly right angles ; with a 

 dorsal channel ; and a deep fovea on either side at the base. Elytra rather lightly striated ; and 

 with two impressed points on the disk of each near the third stria from the suture, which is just 

 perceptibly paler than the rest of the suiface, especially behind. Antenna ferruginous ; palpi 

 and the legs testaceous, — the femora at base and the tibice towards the apex (especially the hinder 

 ones) being usually a little dusky. 

 Var. j3. rather smaller, and a little more piceous ; the prothorax a little narrower, and the elytra 

 more deeply striated. 



Readily known by its large, elongated outline and dark piceous hue, — its legs 

 and antenna3, and the suture behind, being alone pale. Although not so broad, in 

 j)roportion, as the T. nigrocruciatus, it is the longest of the Madeii'au Treclii ; and 

 it would appear moreover to be one of the rarer, or at any rate the more local, 

 species. It is confined to the damp sylvan districts of intermediate and lofty 

 elevations ; and seems to be commoner in the region of the Lombo dos Pecegueiros 

 than in any other portion of the island which I have had an opportunity of inves- 

 tigating, — where, diu'ing Jidy 1850, 1 captured it from beneath stones and decaying 

 logs of wood in comparative abundance. I have Likewise taken it, though more 

 sparingly, on the Lombo das Vacas, in June ; as also at the Cruzinhas and the 



Fanal. 



k2 



