INSECTA MADERENSIA. 65 



A most elegant species, and apparently one of the rarest of all the Madeiran 

 Coleoptera. It may be at once known from the remainder of the genus here 

 described by its large ovate outHne, by its posteriorly widened prothorax, and by 

 its brightly spotted elytra, — which last indeed might almost have been described 

 as quacU-ipunctate did not the existence of the pale varieties seem rather to imply 

 that they should be regarded, more correctly, as testaceous, with two darker bands 

 (the one sutural, and the other postmedial, — and iatersecting each other at right 

 angles) placed vipon them, and which are so immensely developed as to cover the 

 entire sm*face except a conspicuous spot at each of the shoulders, the apex, and a 

 narrow connecting line along the margin. It occurs only at very lofty elevations, 

 its range being the vipper limits of the sylvan districts, and extending perhajjs 

 from about 4500 to 5000 feet above the sea. It is found beneath dead rotting 

 leaves in the vicinity of the springs and small trickling streams ; imder which 

 circmnstances I captured it at the Cruzinhas, during my encampment there in 

 July 1850, as also at the extreme head of the Ribeu-o Fundo, — on the northern 

 edge of the Fanal. 



48. Trechus flavomarginatus, WoU. (Tab. II. fig. 2.) 



T. oblongo-ovatus depressiis nigro-piceus, prothorace subquadrato basi vix angustato et utrinque im- 

 pressD angulis posticis subrectis, elytris striatis ad marginem prsesertim antice et postice flavo- 

 testaceis, antennis infuscatis, pedibus paliidis. 

 Var. /3. paido major et latior, valde depressus, elytris minus profunda striatis atque latius flavo- 

 marginatis. 



Long. Corp. liu. l^^-li. 



Habitat per regionem Maderae sylvaticam, sub lapidibus truncisque arborum projectis, prsesertim in 

 locis humidiusculis, toto auno frequens. 



T. oblong-ovate, depressed, shining, and piceous-black. Prothorax subquadrate, rather wider in front 

 than behind ; the posterior angles nearly right angles ; with an obscure dorsal channel ; and a 

 distinct fovea on either side at the base. Elytra deeply striated ; and with two distinctly im- 

 pressed points on the disk of each near the thu-d stria from the suture ; with the margins, espe- 

 cially about the shoulders and apex, more or less distinctly testaceous-yellow ; and the suture also 

 just perceptibly pale. AntenncB darkly infuscate; their basal joints, the palpi and the legs very 

 pale testaceous, — the tibia at apex, especially the hinder ones, being a little dusky. 

 Var. /3. rather larger, and proportionably wider, also somewhat more depressed ; the elytra less 

 deeply striated, and with the margins and suture more broadly and distinctly testaceous. 



Appareiitly the most abundant of all the Trechi peculiar to these islands ; and 

 it may perhajjs be regarded as especially characteristic of the Madeii^an type, — 

 occupying somewhat of a central position from which most of the others would 

 seem to radiate. It presents, in common with the T. dilutus, a very evident inter- 

 mediate link between the large, ovate, spotted form of the T. nigrocruciatus and 



