Genus Centrinus and its Allies. 327 
prothorax, cordiform, rather slightly convex, deflexed at the 
sides, narrowly striate, interspaces broad, flattish, crossed by 
minute, waved, raised lines, between them whitish piliform 
scales ; body beneath black, shining ; mesosternum, epimera, 
and sides of the abdomen covered with yellowish-red piliform 
scales ; fore legs much longer than the others, their tarsi 
dilated and fringed with long blackish hairs. 
Type of Optatus. Pectoral canal distinct ; anterior cox 
contiguous ; mesosternum raised, nearly vertical in front ; 
first abdominal suture distinct ; scrobes oblique, the posterior 
half passing beneath the rostrum, but not united to its fellow ; 
femora toothed ; claws free, but approximate. 
Centrinus cupreus. 
C. rhombicus, nitide cupreus, glaber, prothorace modice convexo, 
obsolete punctato; elytris leviter striato-punctatis ; corpore infra 
valde nitido, maculis quatuor aureo-squamosis decorato. Long. 
34 lin. 
Hab. Parana. 
Rhombic, glossy copper-coloured ; rostrum slender, mode- 
rately curved, finely and remotely punctured; scrobes post- 
median ; antenne ferruginous ; scape rather short; funicle 
twice as long as the scape, first two joints equal in length ; 
club short, subpyriform ; prothorax slightly convex above, 
obliquely punctured, except at the apex, the base bisinuate, 
scutellar lobe moderately broad; scutellum transverse, the 
apex mucronate; elytra broader than the prothorax at the 
base, shoulders rounded, finely striate-punctate, interspaces 
impunctate, near the apex on each elytron a shortly elevated 
callus; body beneath glossy brown, with a large dense patch 
of rich golden-yellow scales on each side of the metasternum 
and another on the pectus, the metasternum with minute but 
distinct scattered punctures; legs rather stout, tibie short, 
sulcate ; second joint of the tarsi as broad as the third. 
This species is nearly allied to C. lucens and C. cupratus, 
but these have the body beneath entirely glabrous, and have 
more of a golden tint ; the former has the second joint of the 
funicle half as long again as the first, the anterior coxe more 
approximate, a coarser and closer punctuation on the meta- 
sternum, &c. They belong to the Diastethus division, which 
has for its type C. tumzdus, Boh. 
Centrinus guttatus. 
C. ovatus, niger, albo-guttatus, capite prothoraceque antice aureo- 
squamosis ; pedibus ferrugineis, squamis oblongis separatim in- 
