560 CUCUJIDA. 
greatly broader than the eighth, and the eleventh being smaller than the tenth and not 
so distinctly disconnected from it as usual. The punctuation of the elongate, straight- 
sided thorax is extremely obsolete, and there is a vague depression at the base in the 
middle. The elytra are in colour and form like those of Mausibius, and are covered 
with a dense, seriate subangulose sculpture, amongst which no definite punctures can 
be detected ; the sutural stria is distinct only at the tip. 
SILVANUS. 
Silvanus, Latreille, Gen. Crust. et Ins. iii. p. 19 (1807). 
This genus includes a variety of species, several of which are found in food-stuffs, 
and are therefore more or less nearly cosmopolitan. 
1. Silvanus surinamensis. 
Dermestes surinamensis, Linn. Syst. Nat. i. 2, p. 565°. 
Hab. Guatemata, Rio Maria Linda (Champion).—Sourta America, Surinam !. 
Cosmopolitan. 
2. Silvanus muticus, sp. n. 
Ferrugineus, opacus, subdepressus, densissime sculpturatus ; capite post oculos omnium minutissime spinosis ; 
prothorace basin versus angustato, dorso longitudinaliter late bi-impresso, angulis anterioribus bene 
productis, obliquis. 
Long. 3 millim. 
Hab. Guatemaa, San Gerénimo (Champion). 
There are in the Mediterranean region two forms mixed under the name of Silvanus 
bidentatus. S. muticus resembles them extremely, but is distinguished from both by 
the fact that the head is almost destitute of a spine behind the eyes. This character 
readily distinguishes S. muticus from the Central-European S. bidentatus: the 
Mediterranean form has the tooth smaller than the Central-European form, but still 
larger than it is in S. muticus ; it, moreover, has the thorax nearly unimpressed and is 
a little narrower and less depressed. I think S. muticus represents a distinct species 
of this difficult group, though I have only a single example to deal with. 
8. Silvanus guatemalenus, sp. n. 
Ferrugineus, opacus, subdepressus, latiusculus, densissime sculpturatus ; capite post oculos inerme ; prothorace 
basin versus leviter angustato, angulis anterioribus bene antrorsum productis. 
Long. 33-33 millim. 
Hab. GuaTEMALA, near the city, Capetillo, Cerro Zunil, San Gerénimo (Champion). 
This is another very close ally of S. didentatus, and is the largest—especially the 
broadest—insect I have seen of the group. The antenne are rather longer and thicker 
