ADIMERUS. 44] 
Fam, ADIMERIDA*. 
Tarsi quasi biarticulati ; articulo basali dilato, subtus spongioso ; articulo ultimo versus basin articuli basalis- 
inserto ; articulis duobus parvis ad basin articuli terminalis adjunctis. 
The little insects for which I establish this family have a structure of the tarsus 
which has not yet, so far as I am aware, been observed elsewhere in the order 
Coleoptera. The tarsi look at first sight as if they were composed of only two joints, 
the basal joint having a form and structure similar to the third joint of the tetramerous 
Coleoptera, and the terminal joint being inserted near its base above; more careful 
examination, however, shows that there are two small joints attached to the base of 
the terminal joint. This character is of considerable interest : it is well known that in 
many Coleoptera, with feet of less than five joints, a small joint can be detected at the 
base of the terminal joint, so that some writers have used the terms pseudo-pentamera 
and pseudo-tetramera for such insects. In the foot of the Adimeride the dilated joint 
bearing the pubescence is the basal one, while interposed between it and the terminal 
joint are two small joints analogous to the single joint similarly placed in the pseudo- 
tetramera I have referred to. 
The other characters, which will be found in some detail in the description of the 
genus Adimerus, are those of the Colydiide; the division of Colydiide to which the 
family Adimeride perhaps most approximates is the Rhagoderine. ‘The Adimeridee 
in appearance more resemble the Aglycyderide, but are distinguished therefrom by the 
dilated joint of the foot being the first, not the second, and by the anterior acetabula 
being open instead of closed. 
ADIMERUS, gen. nov. 
Antennz ad capitis latera, sub margine, insertz, setosz, decem-articulate ; articulo ultimo clavam parvam 
formante. Coxe anteriores parve, rotundate, sat distantes ; posteriores parum distantes, sat magne, 
breviter transverse. 
Labrum small, simple, visible beyond the edge of the epistome ; mandibles bidentate 
at tip; mentum quadrate; labial palpi three-jointed, terminal joint large; maxillary 
palpi with rather large, oval, terminal joint. Antenne very squamose or setose, 
especially at the base, inserted at the side of the head at a little distance in front of 
the eye, in a cavity protected above by a slightly overlapping edge ; first and second 
joints thick, joints 4-9 small and bead-like, tenth joint forming a small club. Prothorax 
formed as in the Colydiid, with slightly open anterior acetabula ; the coxe quite 
depressed, small, rather widely separated by a margined prosternal process, which 
spreads out behind them, forming an acute angle separated by a quite narrow 
* By D. Smarr. 
BIOL. CENTR.-AMER., Coleopt., Vol. II. Pt. 1, October 1894. 3 L* 
