INSECTA MADERENSIA. 291 



Species valde indigena, et in honorem illust. C. A. Dohrn, qui in Gennania per plures annos scientise 

 Entomologicse patronus exstitit, a me denominata. 



T. narrower, and comparatively more elongated, than the T. villosm, cylindrical (though a little 

 expanded anteriorly), shining (especially the elytra), dark piceous, and besprinkled with fine, 

 erect and cinereous hairs, — which however are much shorter, and not all of them so erect, as 

 those of the last species. Prothorax large, straightened behind and dilated in front ; with a small 

 convexity (almost resembling the rudiments of a nodule) on its fore-disk ; most delicately and 

 distantly punctulated behind, — where it is nearly glabrous, and sometimes of an obscure rufescent 

 tinge ; greatly roughened in front with coarse and somewhat transverse tubercles and points, — 

 where it is produced, and (on account of the expansion) obtusely rounded ; without any appear- 

 ance of either a dorsal channel or ridge. Ehjtra minutely seriate-punctate (the punctures how- 

 ever being much larger than those on the hinder portion of the prothorax), and the interstices 

 also with a longitudinal row of small and exceedingly shallow punctui'es down each (which how- 

 ever, on account of their shallowness, are scarcely perceptible except beneath the microscope) ; the 

 pubescence rather longer than on the prothorax, and somewhat disposed in rows posteriorly ; 

 much less evidently truncated behind than in the T. villosus, — where however there are indications 

 of a few raised costse and tubercles. Antenna and legs pale testaceous. 



A very distinct species, and one of the most truly indigenous of all the Madeiran 

 Coleoptera, — occurring beneath the bark and in the rotten wood of the native 

 laiu'els (occasionally in great profusion) in most of the sylvan regions of inter- 

 mediate and lofty altitudes. It may be easily recognised by its narrow cylindrical 

 form, by the greatly roughened and dilated anterior portion of its (large) pro- 

 thorax, — the hinder haK of which is bright and almost impunctate, whilst its fore- 

 disk is upheaved into an obscure convexity (somewhat resembling an incipient 

 nodule) ; by its, also, finely sculptvu'ed elytra, and by the excessive paleness of its 

 limbs. Contrasted with the T. villosus, it is likewise darker, much more shining, 

 and less pubescent. It is an insect which does not usually make its appearance 

 much before quite the latter end of the spring. Its legitimate range would seem 

 to be from about 2000 to 4500 feet above the sea ; though it evidently attains its 

 maximum rather towards the upper than the lower extremity of those limits. 

 Thus, in the slightly raised districts of Santa Anna and Sao Vincente it is com- 

 paratively scarce, — where nevertheless I have observed it, at times, during Jime : 

 but in the more elevated (and dense) forests of the Lombo dos Pecegueiros it is 

 common ; where, in the summer of 1850, I took an extensive series of specimens, 

 — principally on the wing, or attracted to the white canvass of my tent towards 

 the dusk of the evening: whilst, ascending higher still, to the upland Serras 

 bordering on the Panal, we find it in literal profusion ; so much so indeed, that, 

 whUst encamped at the Cruzinhas (early in July of the same year), I might have 

 captured it by thousands, —especially, as at the Pecegueiros, from off my tent ; 

 although most abundantly, in that locality, during the heat of the day. 



I have dedicated the species to M. Dohrn, President of the Entomological 



Society of Stettin, to whom I am indebted for the contribution of various insects, 



for comparison, throughout the elaboration of this work. 



2 p 2 



