Mr. Waterhouse on a new genus of Carabideous Insects. 281 



one, two are usually larger than the rest. On the lower series 

 the tubercles are usually more numerous than on the upper. 



Under surface. — The triangular spaces between the avenues 

 are granulated ; among the granulations numerous large sto- 

 mata, in form linear and compressed, each placed in a smooth 

 space surrounded by a close border of flattened mammiform 

 tubercles, those forming the lateral borders largest. The 

 avenues are linear, contracting towards the arms. Suckers 

 biserial. Border of avenues formed by transverse plates, each 

 bearing four or five elongated tubercles, two of which face the 

 avenue. These plates are each bordered by a series of gra- 

 nules. 



Eye-cover formed of one large transversely-ovate tubercle 

 terminating the ray, and three or four smaller ones on each 

 side, Avith a circle of minute granules immediately surround- 

 ing the (red) eye. 



Dimensions. — Breadth across the disc 5^ inches ; length of 

 arm If inch ; breadth of arm at base -^^ inch. 



Colour. — When fresh Mr. Maclaurin states it was of an 

 orange-yellow, which with crimson-red, are the usual hues of 

 the Cushion-stars. Dried, it is of a pale j^ellow. 



EXPLANATION OF PLATE VIL 

 Fig. I. The starfish, seen from above. Fig. 4. Marginal plates. 

 Fig. 2. Portion of upper surface. Fig. 5. Border of avenue. 



Fig. 3. Ditto of under surface. Fig. G. Eye-cover. 



XLIII. — Description of a new genus of Carabideous Insects 

 brought from the Falkland Islands by Charles Darwin, Esq. 

 By G. R. Waterhouse, Esq., Assistant Secretary and 

 Curator to the Zoological Society, &c. 



Section GEODEPHAGA. 



Fam. FERONIID.E. 

 XiissoPTERUs*, nov. gen. 

 Corpus depressum, elongatum ; lateribus elytrorum subparallelis. 

 Labrum transversum, antice emarginatum. 

 Labium profunde emarginatum, dente in medio paulo producto, ad 



apicem truncate. 

 Palpi filiformes, articulo ultimo ad apicem truncato. 

 MandibulcE mediocres, edentulse, acutse. 

 Antenna mediocres, articulis subeequalibus. 



Pedes mediocres ; tibirs anteriores in maribus incrassatee, et tarsi ar- 

 ticulis quatuor dilatati. 

 This genus is founded upon an insect discovered by Mr.Dar- 



* Ai7(r6; smooth, and •nrrtgo^, in allusion to the almost total absence of 

 sculpturing on the elytra. 



