INSECTA MADERENSIA. 503 



districts, occurring beneath dead leaves, stones, and logs of wood at lofty and inter- 

 mediate altitudes. It is the least common of the three, nevertheless svifficiently 

 abundant iii certain localities. In most of the ravines opening to the south of the 

 island, and on the Serra de Santo Antonio, it is tolerably plentiful ; and it was 

 captured by Professor Hear on the Pico Grande, in January of 1851. 



383. Hadrus cinerascens. (Tab. XI. fig. 4.) 



H. ovalis niger granulatus et plus minusve lutosus, elytvis substriatis. 

 Long. Corp. lin. 4^-6. 



Hadrus cinerascens, Dejeau, Cat. (3'^"« edit.) 214 (1837). 

 Asida acuminata, Kollar, in litt. 

 Hegeter ffranulosus, Faldermami, in litt. 



Habitat iu aridis subinferioribus maritimis Maderse insularumque Desertarum, sub lapidibus vel in 

 rupium fissiu-is, vulgatissimus, — odorem ingratum spirans. 



H, oval (being rather shorter and less parallel than the last species), also more coarsely and less closely 

 granulated, and more or less densely clothed with duty mud-like scales. Elytra more distinctly 

 striated than in that insect, — though the striae, especially on the disk, are sometimes very faint. 

 Antenna and tarsi somewhat obscurely piceous. 



The S. cinerascens may be readily distinguished from the last species by its 

 smaller size, shorter and more oval form, by its more coarsely and less densely 

 granulated surface, and by the somewhat distincter striae of its elytra. It is 

 usually also more or less clothed with a scaly substance, which imparts to it a 

 dirty or rusty appearance ; and which on the Dezerta Grande takes an almost 

 ferruginous hue, — at times even approximating the colom' of the red volcanic mud 

 of which the higher portions of that island are in a great measure composed. It 

 is most abimdant throughout the maritime districts of Madeira, as also on the 

 adjacent rocks and the three Dezertas ; but in Porto Santo it is represented by the 

 H. illotus, which may perhaps be in reality only a local variety of it. On the Ilheo 

 de Pora (the detached extremity of the Ponta Sao Lom-engo) it exists in the utmost 

 profusion, and attaius nearly as large a bulk as on the Ilheo Chao, — where the 

 specimens are decidedly above the average in poiut of development. It is confined 

 more peculiarly to low elevations,— congregatiag beneath stones, in company with 

 Helopida;, in the driest and most barren spots (its loftiest altitudes seeming 

 scarcely to reach the loioest limits of the H. alpinus). 



384. Hadrus illotus, WoU. (Tab. XI. fig. 6.) 



H. ovalis subdepressus niger granulatus et plerumque dense lutosus, elytris striatis. 



Long. Corp. Un. 5-6. 



Habitat in Portu Sancto insulisque parvis adjacentibus, sub lapidibus vulgaris ; prsecedentis forsan 

 varietas. 



