544 CUCUJIDA. 
Taking for granted, then, that Prostomis should be removed from Passandrine, I 
associate with it an aberrant genus having also the anterior acetabula closed behind 
and the tarsi 4-jointed. The genus Dryocora, Pascoe, is a member of this subfamily. 
I may remark that I have only associated Zhione with Prostomine temporarily. If my 
suggestion to bring Rhizophagine into Cucujide should be adopted, then Thione will 
form a new subfamily allied to the two in question. 
THIONE, gen. nov. 
Corpus cylindricum, capite majore; pygidio haud obtecto. Antenne breves, 10-articulate, articulo basali 
elongato, clava biarticulata. 
Antenne short, base not at all concealed from above ; 10-jointed, club 2-jointed, 
the terminal joint with its apical portion pubescent and annulate; the basal joint 
elongate, curvate. Head very long, eyes placed near its front, epistome furcate, labrum | 
not visible. Mandibles thick, exserted ; gene prominent, but obtuse ; side of the head 
furnished with a depression directed downwards for the reception of the basal joint of 
the antenne in repose; underside without sutures behind those connected with the 
trophi. The mentum is narrowed in front, the ligula elongate, the outer maxillary 
lobe very long and slender; the palpi rather short, with simple, slender, terminal joint. 
Thorax elongate; prosternum prolonged between and under the coxe, which are thus 
embedded by it; cox small, globular so far as can be seen, their acetabula closed 
behind ; prosternal sutures obliterated. Middle coxe moderately distant. Hind coxe 
transverse, very slightly separated by an elongate abdominal process. Abdomen with 
five ventral segments, which are not connate; the three middle segments equal, short, 
each much shorter than the basal or apical one. FElytra abbreviate. Pygidium free. 
Legs rather short; tarsi 4-jointed, filiform, first and second joints furnished with 
delicate, almost hair-like membranous processes beneath, the first longer than the 
second, third small but quite free, fourth elongate, quite as long as the three basal 
joints together. 
These characters, on the whole, I consider bring the insect somewhat near to Rhizo- 
phagus, which genus is usually now placed in the Nitidulide ; its position, however, 
should, I think, clearly be in the Cucujide, from which it is supposed to be 
distinguished by the anterior acetabula prolonged externally. The anterior acetabula 
are, however, prolonged externally in Cucujus, the typical genus of the family 
Cucujide, so that there can be no reason for excluding Rhizophagus on account of 
that character; and I am quite unable to detect any other that would justify the 
exclusion of these insects from Cucujide, where they should, however, form a distinct _ 
subfamily. If Rhizophagus be brought into Cucujide, I think Thione may also be 
placed there, but it must also form a distinct subfamily from any yet recognized, 
characterized by the 4-jointed tarsi, free maxillz, closed anterior acetabula, and 
