Mr. Waterliouse on Carabideous Insects. 351 



land. This view, bold as it is, is strikingly supported by the 

 fact ascertained by Mr. Kemp, that the terraces encircle the 

 highest hills in the neighbourhood of Galashiels, almost to 

 their summits. But as my object in this paper was merely 

 to explain the difficulties suggested by my former one, I shall 

 not anticipate the more able communications about to appear 

 on this important and absorbing subject, or the pleasure to 

 be derived from the * Etudes sur les Glaciers de la Suisse * 

 of Prof. Agassiz himself. J. E. Bowman. 



Manchester, Nov. 16th, 1840. 



XLII. — Carabideous Insects collected by Charles Darwin, 

 Esq., during the Voyage of Her Majesty's Ship Beagle, By 

 G. R. Waterhouse, Esq. 



[Continued from p. 257.] 



All the species noticed in this communication are from Mal- 

 donado, La Plata. 



Genus Brachinus. 



Sp. 1. Brachinus maculipes. 



B. niger ; capite, thorace, pedibus, pectoreque ferrugineis ; germ- 

 bus nigris ; antennis fuscescentibus ; articulis primo et secundo 

 ferrugineis, tertio quartoque nigris : elytris subcostatis. 



B. crepitanti fere similis, at duplo major. 



Long 6J lin. ; lat. 2J lin. 



In form and appearance this species greatly resembles the Bra- 

 chinus crepitans, but its size is much larger ; the eyes are rather 

 more prominent, the elytra are black, and in the specimen before 

 me, destitute of the blue or green tint usually observable in that 

 species, and the striae are a trifle more distinct ; it moreover differs 

 in having the apical portion of all the femora black. Like B. cre- 

 pitans, the third and fourth joints of the antennae are black, but the 

 following joints are pitchy-black, and thus differ from the corre- 

 sponding joints in that species : the abdomen is black beneath, but 

 the chest is pitchy-red. 



But one specimen of this species was brought home by Mr. Dar- 

 win : it is readily distinguished from Brachinus Platensis by its larger 

 size, the black third and fourth joints of the antennae, the black tip 

 to the femora, and the darker colour of the elytra. 



Sp. 2. Brachinus Platensis. 



B. ferrugineus ; elytris fuscescenti-nigris, subcostatis ; abdomine 

 ad apicem nigricante. 



B. crepitanti simillimus, sed paulo major. 

 Long 4£— 5 lin. ; lat. 2— 2 J lin. 



