40 
Mr. H. W. Bates on 
doubtless arises from tbe absence of lobes in the third 
joints for in all Prionides where these lobes are reduced 
in amplitude, the fourth joint is more or less visible. 
IsTo importance is to be attached to the form of the ligula, 
this point being excessively variable in the Prionides. 
II. Peionides veri. 
Cohort I. Subterranei. 
Genus Psalidognathus. 
G. R. Gray, in Griffiths An. King. Ins. ii. 115. 
1. Psalidognathus Incas, 
P. Incas, Thoms. Arc.Kat. p. 42. 
P. Limenius, Erichs. Archiv, fiir ISTat. 1847, i. 139, ?. 
9 . Ps. cupreo-violaceus ; a femina Ps. Friendii dif- 
fert, 1° antennis articulo 3io rugoso-punctato, 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 Enoploceeus. 
Serville, Ann. Soc. Ent. Fr. 1832, p. 146. 
1. Fnojplocerus armillatus. 
Lin. Syst. Kat. ii, 622; Oliv. Ent, 66, pi. v. f. 17, $ . 
E. maximus, elongato-oblongus, brunneus, cinereo- 
tomentosus, elytris cinnamoneis nudis, antennis 
pedibusque nigris nitidis, S scabrosis, ? lasvi- 
bus. 
Long. unc. $ 3-4J, $ 3^. 
I obtained three examples only of this species; on the 
Upper Amazons., on the trunks of dead 
