INSECTA MADERENSIA. 63 



In spite of the large number of TrecM described below, there is but one amongst 

 them of the ordinary European form, the remainder beiag moulded on a type 

 •which would seem to be peculiarly IMadeiran, and almost in fact to merit separa- 

 tion from the normal members of the genus. In its usual state Trechus is winged, 

 has the central tooth of the emargiaation of its mentum entu-e, and the ultimate 

 joint of its palpi very decidedly conical (being of the same breadth at the base as 

 the penultimate one is at the apex) ; whereas, with the single exception just men- 

 tioned, all oiu' present species are apterous, the tooth of then* mentimi is imiver- 

 sally bifid, and the terminal articulation of then palpi has a tendency to become 

 rather more fusiform than conical. StUl, since in then- very elongated linear 

 paraglossae, and in the two internally-produced dilated joints of then male tarsi, 

 they retain the essential characters of the true TrecM, I would not regard the 

 above aberrations as indicative of more than a weU-defined subsidiary section,— 

 especially since the non-development of wings may be ahnost looked upon as a 

 geographical deficiency amongst the Coleopterous population of these islands, — 

 and have therefore merely proposed a subgeneric name in case that it should be 

 found desu-able, at any futiu-e period, to isolate it as a distinct group. The Trechi 

 are particiLlarly partial to damp spots, nevertheless they are not so subaquatic in 

 then- habits as the BemhicUa, being found beneath stones, logs of wood, and dead 

 leaves within the sylvan districts, more than at the edges of streams and on wet 

 mud,— the localities eminently selected by the latter. In Madeii-a they are nearly 

 exclusively confined to the dense ravines of intermediate and lofty altitudes. 



§ I. Alatus : mentum deiite medio iiitegro instructum : paJpi articulo ultimo conico. 



46. Trechus fimicola^ Wall 

 T. oblongo-ovatus depressus cliluto-testaceus, capite nigra, piothorace subcordato basi utrinque vix 



impresso angulis posticis subrotundatis, elytris substriatis, antennis pedibusque testaceis. 

 Long. corp. lin. I5-I7. 



Habitat Maderam borealem, stercore bovino arido in castanetis Sanctae Annte Junio exeunte a.d. 1850 

 a meipso sat copiose repertus. 



T. oblong-ovate, flattened, shining, and brownish- or lurid-testaceous. Head black. Prothorax 

 somewhat cordate, or subquadrate and nan-owed behind ; the posterior angles a little rounded ; 

 with a faint dorsal channel ; and a scarcely perceptible impression on either side at the base ; 

 sometimes a little rufescent, and with the extreme lateral edges generally dark. Ehjtra with very 

 obsolete indications of striae towards the suture, but almost unstriated towards the margin ; and 

 with two very minutely impressed points on the disk of each. Antenna, mouth and legs testa- 

 ceous; the first short and robust. 



Of aU the Madenan Trechi which I have hitherto detected, the present one is 

 the only species which may be said to be truly typical of the genus. It may 



