310 
Mr. H. W. Bates on Gerambycidm 
Genus Dodecosis. 
Bates,, Entom, MontHy Mag. iv. 27 (1867); Lacord, 
Gen. viii. 398. 
(Charac. emend.) . Corpus subcylindricum. Caput 
antice verticale^ breve, tuberibus antenniferis elevatis, 
supra acutis ; palpi brevissimi, apice truncati, vix securi- 
formes ; antennae corpore duplo longiores, filiformes, 
robustge, distincte 12-articulatge, longe pilosae, articulo 
Imo brevi claviformi, 3io paulo 4to breviori, a 4to ad 
12mum aequalibus, simplicibus. Thorax cylindricus, elytris 
multo angustior, inermis, antice et postice transversim 
impressus. Elytra linearia, apice breviter truncata. 
Pedes modice graciles, femoribus paulo incrassatis. Pro- 
sternum inter coxas angustum ; coxis exserto-conicis, 
extus angulatis ; acetabula intermedia extus aperta. 
This genus seems not to fit into any of the sub-families 
or ^^groupes^^ into which Lacordaire has divided the 
Cerambycidce, In its completely 12-jointed and exces- 
sively short antennae, and perpendicular forehead, it 
is unlike any other genus known to me. In facies, 
however, it resembles somewhat the Ohriinm, and it 
seems less out of place in this sub-family than in any 
other. 
1. Dodecosis sajperdAnaj Bates, 1. c, 
Fulvo-testacea, sub-opaca, longe tenuiter pilosa ; an- 
tennis (articulo primo excepto) fusco-nigris, articulis basi 
pallidis j fronte convexa ; thorace lateribus antice breviter 
tuberculato, disco paulo elevato ; elytris dense punctula- 
tis, sutura margine laterali carinaque dorsali ante apicem 
desinente elevatis. 
Long. 34 lin. $ , 
Dab. — River Tapajos. 
One example only. 
The insect resembles, in its general shape, and to some 
extent in the filiform antennge, certain slender species of 
8aperdince, 
