ATYiazonian Prionides, 
57 
thorax in the S' has its lateral margins free from crenn- 
lations^ and is of a tawny-orange colour above and 
beneath, except a narrow mark on the hind margin on 
each side ; above, it has a few strong punctures on the 
sides, and in the deep central fovea. In the $ the 
thorax is crenulate on the sides, and has numerous 
large punctures on the sides and in the central fovea, 
most of the elevated portions being impunctate. The 
posterior part of the elytra, in both sexes, is rendered 
rough and opaque by the extreme closeness and minute- 
ness of its punctuation. In the S , the middle coxaa, 
the greater part of the anterior and middle femora, and 
the broad metasternal process, are fulvous-red. 
I met with one pair only of this species, on the trunk 
of a slender tree, in a small clearing in the forest, near 
St. Paulo, on the Amazons. They were actively moving 
about in the heat of the mid-day sun. 
The following genus seems to be a degraded form of 
the Pyrodes type, wanting the grooved mesosternum, the 
sulcate head, and many other minor characters of the 
group. Its projecting metasternum indicates a nearer 
affinity with Esmeralda than with the Poecilosomince, in 
which group it is placed by Lacordaire. Ho other 
member of the Pcedlosomince or Solenopterince is found 
on the Amazons.* 
* The following very interesting species has recently been discovered 
by Mr. Belt at Chontales, Nicaragua ; it connects the two North- American 
genera Holonotus and B'plienostetlius. 
Holonotus nigrocBneus, n. sp. 
Elongatus, convexus, scaphiformis, Sphenostetho serripenni similis, sed 
scutello baud elongate, aterrimus nitidus, supra prgecipue elytris eeneo- 
tinctus. Caput parvum, supra late sulcatum, grosse sparsim puncta- 
tum. Antennae ( $ ) dimidio corporis breviores, articulis valde com- 
pressis latis, vix punctatis. Thorax a basi usque ad apicem attenuatus 
et declivis, marginibus lateralibus integris, disco sparsim subtiliter, 
lateribus grosse et rugose pmictatus, margine postico elytris angus- 
tiore, utrinque sinuate, lobo mediano truncate. Scutellum latum, 
triangulare, apice depressum, laeve. Elytra a basi usque ad apices 
regulariter attenuata, humeris obliquis rotundatis, apicibus rotundato- 
truncatis serratis ; supra coriacea, subnitida, passim modice punctata. 
Subtus glaber, pectoris lateribus punctatis, vix pilosis; mesosternum 
crassum, apicem prosterni incumbens. Pedes nigerrimi, nitidi, tarsis 
brevibus, latis. 
Long. 1 unc. 2 lin., lat. 5 lin. ? . 
Hah. — Chontales, Nicaragua ; in Mus. nostr. 
