128 ZOOLOGICAL EXERCISES. 
Tribe HYDRADEPHAGA. 
ANALYSIS OE THE FAMILIES. 
A. Anterior legs short ; antennze long Dyticider. 
B. Anterior legs long ; antennze short Gyrimdee. 
Tribe BRACHELYTRA. 
ANALYSIS OF THE FAMILIES. 
A. Tarsi five-jointed . Staphylonde. 
B. Tarsi apparently three-jointed . . Pselaphider. 
Tribe PALPICORNIA. 
ANALYSIS OF THE FAMILIES. 
A. Tarsi filiform, often ciliated .  Hydrobude. 
B. Terminal joint of anterior tarsi dilated Spheridude. 
Tribe CLAVICORNIA. 
ANALYSIS OF THE FAMILIES. 
. Antenne elbowed ; ‘ : Histeride. 
. Antenne straight. 
a. Legs capable of being retracted into 
cavities in the body a Byrrhide. 
b. No cavities in the body for the legs. 
* Coxee of the four anterior legs small 
> 
and globular . , ; Colydiide. 
** Coxee of the legs normal. 
+ Tarsi dilated : .  Nitidulide. 
++ Tarsi simple. 
1 Antenne long : Cucujide. 
2 Antenne short. 
Club two or three-jointed Trogostide. 
Club four or five-jointed Silphidee. 
