Mr, C. O. Waterhouse on new Coleoptera. 157 
ancient genus preserving most of the essential features of 
Belogona Euadenia, and Helicella, an early branch of the 
Belogona Siphonadénia, but decidedly nearer to the latter 
genus. Should the myologic character mentioned prove to be 
as in ordinary Helices, Cylindrus will stand near STelicella 
and the genus Hygromia (Fruticicola of authors). 
In either event, I contend that Cylindrus is a genus of 
Helicide belonging to the division Belogona Siphonadenia ; 
that it has no affinity with the Pupa or Buliminus groups 
beyond the bond uniting all Pulmonata Geophila; and that 
it is only another instance of that parallelism or homoplasy 
which has in many times and places moulded creatures of 
widely diverse structure into a deceptive external similarity. 
XXI.—Descriptions ef new Coleoptera in the British 
Museum. By Cuartes O. WATERHOUSE, F.E.S. 
Lucanide. 
DIGONOPHORUS, gen. nov. 
General form parallel, depressed. Mentum transverse, 
obliquely narrowed in front, with the front margin emar- 
ginate. Antenne not very long, flattened, and, when at rest, 
lying in a distinct but shallow impression at the side of the 
submentum; the seventh joint about as broad as long, 
shining; the eighth, ninth, and tenth forming a rather small 
club, the joints pilose, except the base of the eighth. Pro- 
sternal process horizontal, convex, nearly parallel, narrow, 
only very slightly narrowed towards the apex, vertical poste- 
riorly. Mesosternum swollen and convex between the cox, 
only slightly sloping, almost vertical anteriorly. Anterior 
tibie formed much as in Cladognathus bison g, four poste- 
rior tibize without spines. ‘Tarsi densely pilose below. 
I think this curious insect must be placed next to Clado- 
gnathus, from which it differs in the small antennal club, 
short transverse mentum, narrow subparallel prosternal 
process, and convex rather prominent mesosternum, &e. 
The female is unknown to me. 
Digonophorus Atkinson, sp. n. 
dc. Elongatus, parallelus, depressus, piceo-rufus, nitidus; man- 
dibulis capite duplo longioribus, depressis, parallelis, ante apicem 
intus processu valido antrorsum oblique directo instructo; capite 
