uncharacterized species of Humolpide. 495 
transverse, its apex broadly truncate; eyes oval, 
obsoletely sinuate; antennz nearly equal to the body in 
length, the three lower joints fulvous, the rest black. 
Thorax twice as broad as long; sides subangulate, 
armed in the middle with three very short subacute 
teeth, anterior and posterior angles mucronate; upper 
surface very coarsely and irregularly punctured, deeply 
and broadly excavated on either side. Hlytra much 
broader than the thorax, narrowly oblong, subparallel, 
conjointly angulate, rotundate at the apex; above 
convex, slightly excavated transversely below the basilar 
space, the humeral callus prominent; surface rugose, 
strongly and closely punctate, each elytron with several 
ill-defined longitudinal cost, which are only visible here 
and there on the surface; one of these near the lateral 
margin is more distinctly raised and entire. 
The robust form, the coarsely-punctured and deeply- 
excavated thorax, together with the rugose-punctate 
elytra, will at once separate this species from its allies. 
Metaxyonycha Bates. 
Elongata, convexa, fulva, nitida, antennis, basi ex- 
ceptis, tibiis tarsisque nigris ; thorace irregulariter punc- 
tato, utrinque sat profunde transversim excavato ; lateri- 
bus tridentatis ; elytris anguste oblongis, apice conjunctim 
angulato-rotundatis ; convexis, infra basin excavatis, 
callo humerali prominenti ; crebre sat fortiter sed confuse 
punctatis, basi et ad apicem obsolete costatis, costis 
duabus externis magis elevatis, integris; fasciis duabus 
latis, una basali, utrinque anguste abbreviata, secunda 
infra medium, communi ad marginem lateralem non 
extensa, viridi-cyaneis. Long. 5}—6 lin. 
Hab. Upper Amazons, Ega, St. Paulo; collected by 
Mr. Bates. 
Head coarsely punctured, front deeply excavated ; 
clypeus trigonate, less strongly punctured than the 
upper face; eyes rotundate-ovate, very slightly sinuate ; 
three lower joints of antenne fulvous, the rest black. 
Thorax nearly twice as broad as long; sides rounded, 
armed in the middle with three short obtuse teeth, 
anterior and hinder angles mucronate; disk rather 
coarsely and irregularly punctured, deeply excavated 
