COLEOPTERA. 
21 
Pachymerus incrustatus, Sch. 
Breviter ovato-subquadratus, niger , tomento albido aut jlavo-albido dense 
teclus; thoracis longitudinaliter elevati et canaliculati maculis dua- 
bus subconnexis ante-apicalibus , elytrorumque basi quadricallosorum 
callo humerali , litura transversa intra-marginali versus medium ma- 
culaque marginali ante-apicali nigro-fuscis ; antennarum basi apice- 
que , pedibus quatuor anterioribus tarsisque posterioribus plusminusve 
ferrugineis; pygidio ovato-sublrigono , subperpendiculari y lateribus 
utrinque tuberculo instructo ; femoribus posticis inius ante apicem 
dente magno tribusque parvis adjectis , armatis. 
Longit. major indiv. (cap. infl.) 2^ lin. = 4f g millim. 
Latit. infr. hum. 1^ lin. = 2f g millim. 
Longit. minor, indiv. (cap. infl.) 1^ lin. = 3 millim. 
Latit. infr. hum. § lin. — lio millim. 
Patria : Columbia ( Lebas ); India occidentalis ( Olivier — Chevr. y Sch.) : 
Brasilia (Dej., Dup ., subnomine Pachym. luridus, Dej.; D. Saun¬ 
ders). 
This species, widely distributed in the South-American continent, 
varies much in size and colour. Gyllenhal and Sehonherr having had 
specimens without antennas, and having omitted several particularities, I 
think it useful to add the following characters:— 
Antennae moderate sized, reaching the base of the thorax: basal and 
apical joints more or less light ferruginous; generally black or dark fuscous 
from the 5th to the 10th, but sometimes the 7th to 10th only are black; in 
some of those individuals where the dark colour is more extended, the ter¬ 
minal joint is also fuscous, but always lighter. 
Thorax longitudinally elevated in the middle; this elevation divided 
by a thin longitudinal channel; each side of the base having a tubercle 
separated from the central elevation by a deep impression. 
Elytra having at their base, exactly behind the thoracieal tubercle, a 
short callosity, and their shoulders are also callose: these form a transverse 
basal row of four tubercles (two on each elytron) ; they have also a minute 
callosity a little above the apex. 
Pygidium ovate-subtrigonal, subperpendicular, rather convex, with a 
small tubercle in the middle of each lateral margin. 
