260 . SUPPLEMENT. 
examined a large number of species, I am inclined to agree with him; the greater 
length of the spine at the tip of the intermediate femora which distinguishes a few 
extreme forms, and is the sole character of Hexoplon, not being supported by other 
structural modifications. One of the chief features which distinguishes Gnomidolon 
and Hexoplon from Ibidion and Octoplon appears, however, to have been overlooked by 
Lacordaire, though duly mentioned by Thomson; it is the long and slender curved 
scape, almost always produced or dentate at its exterior apex. The form of the 
antenniferous tubercles, which Lacordaire brings into the first rank of characters, 
appears to have no systematic importance. 
About a dozen species of the group Hexoplon are known, and more than a score of 
Gnoméidolon, all peculiar to Tropical America, the great majority to the Guiana and 
Brazil subprovinces. 
1. Gnomidolon letabile. (Tab. XIX. fig. 1.) 
Hexoplonti albipenni simile, sed multo minus, sparsim setosum, antennis infra sparsim ciliatis; castaneo-rufum 
politum, subtus nigricans, pectoris et ventris lateribus argenteo-sericeis ; antennis (art. 1°-2™ rufis exceptis), 
pedibus et elytris flavo-testaceis, his utrinque maculis tribus castaneo-nigris sequidistantibus, 1° lineari 
subbasali, 28 parva rotunda mediana, 34 ante-apicali, rotundata, suturali; scapo elongato curvato extus 
apice perparum producto obtuso, articulis 3°-4™ vel 3°-6™ bicarinatis ; thorace elongatissimo, levi ; elytris 
apice transversim truncatis, angulo exteriori solum spinoso, medio dorso depresso, prope suturam et basin 
lineato-punctato ; femoribus quatuor posticis valde elongatis sed gradatim (preecipue intermediis) clavatis, 
apice brevissime bidentatis, posteriorum dente exteriori paullo longiori. ; 
Var. Macula elytrorum subapicali deficiente, antennis basi tarsisque nigricantibus. 
Long. 33—4 lin. 
Hab. Panama, Bugaba (Champion). 
Many examples, apparently of both sexes. 
2. Gnomidolon insulicola. (Tab. XIX. fig. 2.) 
Parvum, lineare, castanco-rufum, politum; antennis (scapo basi obscuro excepto), pedibus (femoribus posticis 
medio fuscis exceptis) elytrisque testaceo-fulvis, his medio fascia angusta paullo obliqua (suturam haud 
attingenti) fusca maculaque vaga utrinque ante fasciam flavescenti; antennis infra sparsim ciliatis, scapo 
elongato-curvato, antice integro, apice haud producto, articulis 3°—4™ ( @ ) gracilibus obsoletissime carinatis ; 
thorace anguste cylindrico valde elongato, leevissimo ; elytris apice transversim truncatis, angulo exteriori 
longe spinoso, dorso medio depresso pauciter setoso juxta suturam et basin sat grosse seriatim punctato ; 
pedibus gracilibus, femoribus elongatis gradatim clavatis, apice bidentatis, posticorum dente exteriori 
spiniformi; pectoris ventrisque lateribus argenteo-sericeis. 
Long. 2% lin. 
Hab. Panama, Taboga Island (Champion). 
One example. 
OCTOPLON (p. 30). 
Octoplon glabriolum (p. 30). ; 
To the locality given, add :—Mexico (Hoge). 
