1878. ] 507 {Horn. 
mark these two genera as members of another family which may be called 
DiIscOLOMID 4. 
Mychocerus and Murmidius must also form a distinct family following 
the example of Duval. 
The arrangement followed in the present paper, although substantially 
that of Erichson, is based on other characters which appear to me more 
natural and constant. I have added a new tribe, Rhagoderini, to contain 
those genera without retractile antenne, and also Deretaphrini for those 
genera ‘with the anterior cox contiguous or very nearly so. The tribes 
thus become increased to seven and are distinguished as follows : 
Antenne perfoliate, not retractile, distant at base from the eyes.. sehs eicieece 
Rhagoderini. 
Antenne capitate, retractile, arising close to the eyes. 
Last joint of palpi not acicular. 
Anterior cox slightly separated. Head horizontal. 
Hirstip Olt; OftALSh SMOG. 2a s\elcle eye =fe.c\* ice) =, </e ode gat Synchitini. 
First joint of tarsi longer than the second. .............. Colydiini. 
Anterior coxse contiguous or very nearly so. Head deflexed...... Bae 
Deretaphrini. 
Anterior coxze distant. 
Antenne arising under a frontal margin. First ventral segment not 
elongate. ‘Trochanters free .......... AGaoeBads Pycnomerini. 
Antenne free at base. First ventral elongate. Trochanters closely 
connate with the femora....... ofocuooesbaon sant Bothriderini. 
Last joint of palpi acicular. 
First ventral elongate. Antenne free at base............ Cerylonini. 
Tribe l. RHAGODERINI. 
Antenne perfoliate, inserted under the frontal margin at a distance from 
the eyes, not capitate nor retractile. Anterior coxee small, rounded, moder- 
ately separated by the prosternum, which is more elevated than the coxe, 
and slightly dilated behind them. Middle coxe more distant than the an- 
terior. Posterior coxe oval, small, variably distant, their cavities partially 
closed externally by the metasternal side pieces which are narrow. Tarsi 
short, the first three joints not longer than the fourth Abdominal seg- 
ments gradually decreasing in length, the fourth, however, shorter than the 
fifth. Tibize without terminal spurs. 
In the above characters a certain number of genera agree, 
important differences, however, are found, which, with the 
increase of the number of the genera, will warrant the divi- 
sion of the tribe into several. First in importance is the 
structure of the anterior coxee, which are very plainly open 
behind in Rhagodera and Corticus, and closed in Anchomma. 
The eyes exhibit the next important difference. In the two 
