EUSTILBUS.—LIOPHALACRUS. 2595 
Readily distinguished by the pallid colour and the angulate fascia behind the middle 
of the wing-cases. There is a sutural stria and faint indications of other strie on the 
elytra, but no punctuation whatever. The antenne are slender, with elongate club. 
Two examples. 
5. Kustilbus placidus, sp. n. 
Rotundato-ovalis, testaceo-brunneus, antennis pedibusque testaceis; levigatus, elytris stria subtilissime 
posterius impressa. 
Long. 2 millim. 
Hab. Muxtco, Teapa in Tabasco (H. H. Smith). 
This species is without trace of sculpture on the elytra, and the sutural stria is very 
fine and near to the suture, and only visible on the declivous apical part. The form is 
more rotund than in our other species of Eustildus. The antenne have a rather 
broad club; and the scutellum is quite small. Two examples, found in February 
1888. 
6. Kustilbus zqualis, sp. n. 
Ovalis, valde convexus, testaceo-ferrugineus, nitidus, fere levigatus ; elytris stria suturali abbreviata. 
Long. 17 millim. 
Hab. Gvaremata, near the city, San Gerénimo (Champion). 
Antenne short, but with rather elongate club. Thorax truncate at the base in the 
middle, and not margined. Elytra a good deal narrowed behind, very shining, their 
sutural stria placed very near the suture and not extending far forwards. 
Seven examples. In this minute Eustilbus the sete on the prosternal process, 
though very fine, are remarkably elongate. 
LIOPHALACRUS, gen. nov. 
Corpus hemisphericum. Tarsi posteriores minus elongati, articulo primo brevi, secundo elongato. Tibie 
minute calcarate. Pedes intermedii late distantes ; metasternum inter hos haud marginatum ; mesosternum 
conspicuum ; prosternum apice minute setosum. 
A not very distinct genus; allied by the structure of the breast to Hustilbus, but by 
the hind tarsi nearer to Litolibrus, and indeed in this latter respect forming a connecting- 
link between Olibrus and Litolibrus. The basal joint of the hind tarsus is short, and 
not very closely connected with the second joint, though no motion appears to be 
possible between them; the second joint is more than twice as long as the first. The 
metasternal process is very broad, and the mesosternum forms in front of it a piece of 
more than usual size, the two being separated by an extremely fine raised margin. 
