550 INSECTA MADERENSIA. 



lato depresso, prothorace trans verso-subquadrato obsolete canaliculate, elytris fusco-testaceis, 

 antennis pedibusque sat robustis, illis basi dilutioribus, his testaceis. 

 Long. corp. lin. 1|. 



Habitat Maderam borealem, inter muscos uvidos et lutum juxta aquas desilientes fodiens, rarior : ad 

 Sanctum Vincentium mense Junio a.d. 1850 pauca specimina inveni. 



H. rather broad and linear, black or browTiish-black, head, prothorax and elytra most delicately and 

 closely granulated, and with small punctures intermked ; nearly opake, and subdepressed. Head 

 wide, and with the forehead somewhat flattened. Prothorax also rather wide, transverse-sub- 

 quadi'ate (being of nearly equal breadth before and behind) ; and with an obscure dorsal channel. 

 Elytra more or less brownish-testaceous, being generally palest towards the suture. Abdomen 

 with the apical segment and the extremity of the basal ones obscurely fuscescent. Antenna and 

 kffs not quite so long as in the H. uhliquepunctata, but altogether a little robuster ; the former 

 rather less slender at their base, wliere they are diluted in colouring ; the latter testaceous. 



Distinguished by its comparatively wide head and prothorax (the former of 

 which is more depressed than in any of the other species), by its brownish-testa- 

 ceous eh-tra, rather robust limbs, and by its serai-opake and very minutely granu- 

 lated surface (on \^hich there arc most delicate punctures intermixed). In its 

 habits it is intermediate between the strictly subaquatic and terrestrial forms, 

 residing in damp spots (generally amongst mud or moss) on the ledges of the 

 dripping rocks or in the vicinity of cascades, — but not, like the S. obUqueimnctata 

 and the Taclnjusa r(q)tor'u(, beneath stones and shingle at the margins of streams. 

 I have captured it sparingly towards the northern coast, — especially at the edges 

 of the first waterfall, along the Sao Viucente beach, in the direction of Seisal. 



419. Homalota gregaria. 



H. angusto-lincaris nigra (vel fusco-nigra) obsoletissime granulato-punctulata nitida depressa, pro- 

 thorace postice vLx angustato et fove& media abbreviate impresso, elytris subtestaceo-fuscescen- 

 tibus, antennis pedibusque longiusculis, ilUs fuscis, his testaceis. 



Long. Corp. lui. l^-lj. 



Homalota gregaria, Erich. Gen. et Si)ec. Staph. 87 (1839). 



Tachyitsa immunita. Id. 916. 



Homalota gregaria, Eedt. Fna Aiistr. 659 (1849). 



Habitat sub lapidibus vix supra oram maritimam Portus Sancti jacentibus, uon infrequens. 



H. narrow and linear, black (or brownish-black), head, prothorax and elytra most obsoletely granu- 

 lated, and with scarcely appreciable punctures intermixed ; shining, and depressed. Prothorax 

 rather small, and very slightly narrowed behind ; and \nth a central depression, or shallow fovea, 

 posteriorly. Elytra more or less fuscescent, being palest (and generally somewhat testaceous) 

 towai'ds the suture. Antenna and legs about as long as in the previous species, but rather 

 slenderer ; the former entirely of a dull reddish -brown, or fuscous ; the latter testaceous. 



