( Ixxvii ) 



of "obstiuate" or "pig-headed," "Cascudo" means ''with 

 a thick shell," and figuratively "of a rough extei'ior." It is 

 probable that the word is here used in the latter sense. 

 Burchell's specimens (2) and (3) are represented below. 





.*-•■!- -^■'*!--vV.-' 



-^Lj. 



Natural size. 



Two specimens of Conorrhinus megistus, Burm., together with the 

 labels which accompany them. 



Commander Walker has directed my attention to Darwin's 

 account of another species of the same genus which he 

 encountered only a few years later than Burchell, but in a 

 very different part of the continent. This species, probably 

 C. infestans, Klug., was spoken of as the Benchuca. Darwin's 

 interesting record is as follows : — " At night [at Luxan, near 

 Mendoza, Mch. 26, 1835] I experienced an attack (for it 

 deserves no less a name) of the Benchuca, a species of 

 Reduvius, the great black bug of the Pampas. It is most 

 disgusting to feel sjft wingless insects [Darwin probably 

 refers to the immature stages], about an inch long, crawling 

 over one's body. Before sucking they are quite thin, but 

 afterwards they become round and bloated with •blood, and in 



