446 COLYDIIDA. 
Subfam. SYNCHITINA. 
This group comprises the larger part of the Colydiide, but in the present state of 
our knowledge I see no way of dividing it further than separating the Tarphiine and 
Colydiine ; and at present the distinction of even . these groups by rigid characters is 
no easy matter. | 
In the Synchitine the antenne are quite retractile during repose, and frequently there 
are grooves on the underside of the head to facilitate their complete retraction. All 
the cox are but little separated ; there are no depressions on the flanks of the pro- 
sternum for the antenne; the tibie are thin at the tip, and in the majority of the 
genera the anterior acetabula are open behind. 
This latter character would probably furnish a better mode of distinguishing the 
group from the Colydiine than that afforded by the relative length of the joints of the 
hind tarsus; unfortunately it has not been studied in most of the genera, and cannot 
at present be made use of. 
ANISOPAULAX. 
Anisopaulaz, Reitter, Stett. ent. Zeit. 1877, p. 324. 
This genus was established for a Mexican insect that is not included in the collections. 
our editors have amassed, and that I know only from Reitter’s description. 
1. Anisopaulax brucki, 
Anisopaulax brucki, Reitter, Stett. ent. Zeit. 1877, p. 324°. 
Hab. Mexico! (coll. von Bruck). 
This insect possesses 10-jointed antenne having a 3-jointed club. 
re 
LABROTRICHUS, gen. nov. 
Corpus elongatum, convexum, hispidum. Caput exsertum; antenne undecim-articulate, clava discrete biarti-. 
culata. Tarsi fere triarticulati; articulo basali omnium brevissimo. 
The very short basal joint of the foot distinguishes this insect from most others of 
the family. Diéstaphyla is allied in this and other respects, but differs from Labdro- 
trichus in the structure of the thorax. 
Eyes hispid. Antenne distinctly eleven-jointed, the club consisting of two perfectly 
separate joints. Antennary grooves quite absent. Anterior acetabula closed, coxe: 
moderately distant. Metasternum of moderate length. Hind and middle coxe about 
as widely separated as the front pair. Hind body moderately long; the first ventral 
segment only about as long as the second, the fourth much shorter than that preceding 
or following it. Legs hispid. Tarsi with the basal joint almost invisible, then with. 
