40 Mr. H. W. Bates on 



doubtless arises from the absence of lobes in tlie third 

 jointj for in all Prionides where these lobes are reduced 

 in amplitude,, the fourth joint is more or less visible. 

 JSTo importance is to be attached to the form of the ligula, 

 this point being excessively variable in the Prionides. 



II. Prionides veri. 



Cohort 1. Suhterranei. 



Genus Psalidognathus. 

 G. R. Gray, in GrifiBth^s An. King. Ins. ii. 115. 



1. Psalidognathus Incas. 



P. Incas, Thorns. Arc. Nat. p. 42. 

 P. Limenius, Erichs. Archiv. fiir Nat. 1847, i. 139, ?. 



$ . Ps. cupreo-violaceus ; a femina Ps. Friendii dif- 

 fert, 1° antenuis articulo 3io rugoso-jDunctato, 2° 

 elytris magis subtiliter vermiculato-rugosis, et magis 

 distincte tricostatis, 3° prosterno fortiter scabroso. 



One example, a female, obtained at Tabatinga, on the 

 frontier of Brazil and Peru. 



Cohort 2. Sylvani, 



Genus Enoplocerus. 

 Serville, Ann. Soc. Ent. Fr. 1832, p. 146. 



1. Enoplocerus armillahis. 



Lin. Syst. Nat. ii. 622; Oliv. Ent. QQ, pi. v. f. 17, $ . 



E. maximus, elongato-oblongus, brunneus, cinereo- 



tomentosus, elytris cinnamoneis nudis, antennis 



pedibusque nigris nitidis, S scabrosis, $ Isevi- 

 bus. 



Long. unc. $ 3-4i, ? 3^. 



I obtained three examples only of this species ; on the 

 Upper Amazons, , on the trunks of dead treeg„ 



