COLYDIID. 445 
This insect is extremely closely allied to A. crispatus, but is more parallel and less 
convex, and the sete are apparently broader and are more conspicuous. As in the 
other species, the surface is so much encrusted that the details cannot be seen; but 
the form of the elytra sufficiently distinguishes 4. setosus from A. crispatus. Five 
specimens. 
38. Adimerus dubius. 
Angustus, subdepressus, ferrugineus, rugosus, setis tenuibus ornatus ; elytris nigro-maculatis, subparallelis. 
Long. 2 millim. 
Hab. Mexico, Cordova, Jalapa (Hége), Motzorongo (flohr); British Honpuras 
(Blancaneaux). 
This species is smaller than A. setosws, and the slender sete are more like simply 
truncate hairs; the costa on the wing-case is very obscure, indeed can only be seen at. 
the base. The punctuation seems even coarser than it is in A. crispatus, from which 
species A. dubius may be distinguished by the more depressed parallel form. 
We have received ten specimens of this species; apparently it varies but little. 
Fam. COLYDIIDE *. 
This family of Coleoptera is one of considerable interest, the larger number of its. 
species being confined to the undisturbed forest-regions of the world, where they live 
amongst decaying wood or vegetable matter mingled with fungoid growths. 
The classification of the family is but little advanced ; it is indeed in an altogether 
unsatisfactory state. The Colydiide were first separated as a family by Erichson in 
the ‘ Naturgeschichte Ins. Deutschlands,’ vol. iii., where the genera were defined only in 
tabular form and by brief notes, many of them possessing no species. Owing to the 
rarity of these insects in collections, and to the unsatisfactory start made by Erichson, 
no complete attempt has been made to reconsider the groups of genera established by 
the German author. Horn has indeed contributed some valuable suggestions concerning 
the N.-American forms; but the fauna he dealt with is not specially rich in these 
insects, so that his remarks leave a very large number of the genera untouched. 
As we shall have to distinguish about forty genera in the following pages, I think it 
is necessary to devise some means for their intelligible arrangement, and I have there- 
fore drawn up a brief table of the subdivisions I propose to adopt. Although it is far 
too soon to attempt a classification intended to be permanent (for probably not one- 
tenth of the existing genera have been discovered), yet I hope the arrangement may be 
* By D. Sapp. 
3 L* 2 
