Mr. C. O. Waterhouse on new Coleoptera. 379 
the present also we have no sound data for deciding whether, 
how, and when the Ascones and Leucones were developed from 
the Pharetrones. It is, however, certain that the family 
Sycones branched off very early (at least in the Jurassic 
period). 
[To be continued.] 
XLI.— Descriptions of new Coleoptera belonging to the 
Genera Monomma, Silis, and Lithinus. By CHARLES O. 
Waterhouse. 
Monommidae. 
Monomma quadrimaculatum, sp. n. 
Elliptico-ovale, convesum, piceum, nitidum; elytris nigro-piceis, 
maculis rotundatis rufis notatia. 
Long. 2|- lin. 
General form of M. philippinarum. Head very closely, 
finely, but distinctly punctured. Thorax densely and rather 
strongly punctured; the sides not reflexed, but narrowly im¬ 
pressed within the margin. Elytra rather strongly and closely 
striate-punctate; the punctures in the scutellar region much 
larger, the first stria very short; the interstices rather closely, 
very delicately, but distinctly punctured; each elytron with 
two rather large round spots, one near the shoulder, the other 
6ubapical. 
Hob. Philippine Islands [Cuming). 
Monomma pilosum , sp. n. 
Elliptico-ovale, leviter convexum, nitidum, nigro-fuscum, fulvo- 
pilosum; thorace subtiliter irrcgulariter punctulato, angulis 
anticis productis obtusis, marginibus piceis ; elytris sat fortiter 
atriato-punctatis, striis apicem versus evanescentibus ; prosterni 
projectura valle marginata, medio fortiter parce punctato ; tarsia 
longis. 
Long. 6-L lin. 
Rather an elongate species, not very convex, blackish 
brown, with very short fulvous pubescence above. Thorax 
not quite twice as broad as long, very finely and not very 
thickly punctured, the lateral margins flattened but not re¬ 
flexed. Elytra scarcely broader than the thorax, three times 
as long, rather attenuated towards the apex; the lines of 
punctures are well marked, but disappear towards the apex; 
