ALCIDION.—HEXACONA. 157 
fascia and the apex. From A. brachiale, which it resembles in size, shape, and markings, 
it is at once distinguishable by the greatly prolonged outer angle of the apex of the 
elytra. 
4, Alcidion scutellatum. 
A, eulopho affine, paullo magis couvexum elytrisque lateribus magis rotundatis etc., elongato-ovatum, cinereo- 
fuscum, elytris utrinque plaga magna laterali sat ante apicem atro-fusca, antice litura angulata, intus 
(suturam versus) lineola, aterrimis marginata; antennis rufo-testaceis, articulis omnibus apice nigris, scapo 
subtus valde flexuoso; thorace lateribus medio paullo tumidis, disco nigro bituberculato ; scutello nigro, 
linea mediana pallida; elytris apice oblique sinuato-truncatis, angulo exteriore producto, tuberculo com- 
presso, fere conico, centro-basali, costulis dorsalibus et carina laterali obtusis nigro-guttatis; tibiis anticis 
intus bisinuatis. 
Long. 4 lin. 
Hab. Guatemata, Cerro Zunil (Champion). 
5. Alcidion privatum. (Lophopwum privatum, Tab. XII. fig. 10.) 
Alcidion privatum, Pascoe, Trans. Ent. Soc. ser. 8, vol. v. p. 2367; Bates, ibid. 1872, p. 236°. 
Hab. Guatema.a, San Gerénimo, Duefias (Champion); Nicaragua, Chontales (Belt'). 
—Sovutu America, Colombia, Santa Martha 2. 
6. Alcidion brachiale. (Tab. XII. fig. 13.) 
Alcidion brachiale, Bates, Trans. Ent. Soc. 1873, p. 214°. 
Hab. Mexico, Cordova (Sallé); Guatemaia, Sabo (Champion); Nicaracua, Chontales 
(Belt 1). 
7. Alcidion adjunctum. 
Alcidion adjunctum, Thomson, Syst. Ceramb. p. 544. 
Hab. Costa Rica. 
HEXACONA. 
Corpus elongatum, subtrigonum, vix convexum. Caput antice latum ; oculi parvi, distantes ; frons planata, verti- 
calis. Antenne corpore paullo longiores, setacee, brevissime setosw, scapo robusto et elongato, valde 
flexuoso fere difformi, apice subtus valde producto; articulo tertio quam scapum paullo longiore. Thorax 
transversus, tuberculis magnis quatuor conico-compressis: viz. duobus lateralibus, duobus discoidalibus. 
Elytra elongato-trigona, tuberculo utrinque centro-basali valido conico, carina obsoleta dorsali. Pro- et 
mesosternum lata. Femora valde clavata; tarsi postici articulo primo quam duo sequentes conjuncti 
dimidio longiore. 
This genus forms part of a small group, which are allied to Alcidion, but are 
distinguished by the thorax being armed with medio-lateral spines or tubercles. To 
the group belong the genera Tithonus, Belesthes, Cleodoxus, Lathreus, Lophopaum, &c., 
most of which consist at present of one species only. In Hexacona these tubercles are 
as largely developed and as conical as in many of the Acanthoderini, and are accom- 
