ANALYTICAL TABLES. 195 



Table for Determining the Families of Coleoptera. 



(Adapted from LeConte and Horn's Classification of tlie Coleoptera of North 



America.) 



A— Head not distinctly prolonged Into a beak. 

 B— Hind tarsi with the same number of joints as the others. 

 C — Fourth and fifth tarsal joints not connate. 

 D— First ventral segment divided by the hind coxal cavities, so that the 

 sides are separated by the very small medial part. 

 E— Metasternum with an antecoxal piece, separated by a well marked 

 suture, reaching from one side to the other, and extending in a tri- 

 angular process between the hind coxse. 

 F — Antennae ll-jointed: habits terrestrial. 

 G— Antennae arising at the .side of the head between the base of the 



mandibles and the eyes (Carabidas. ) 



GG— Antennae Inserted on the front above the base of the mandibles. 



(Cinclndelld^ ) 

 FF— Antennse 10-Jolnted; habits aquatic; hind coxae fixed and with 

 large plates almost entirely concealing the abdomen. 



(Haliplidas.) 

 EE— Metasternum without antecoxal piece, prolonged Into a triangular 

 process posteriorly ; habits aquatic. 

 F— Antennae slender, filiform or setaceous; abdomen with six seg- 

 ments ; eyes two (Dytiscidse.) 



FF— AntennEB irregular, very short; abdomen with seven segments; 



eyes four (Gyrinidae.) 



DD— First ventral segment visible for its entire breadth. 



E— Antennae clavate or capitate, not lamellate (ClavlcomidaB ) 



r— Dorsal segments of the abdomen entirely corneous ; elytra usually 

 short. 



G — Abdomen flexile, ventral segments eight (StaphylinidEe ) 



GG — Abdomen not flexile, segments five or six (Pselaphidifi. ) 



FF— Dorsal segments of the abdomen partly membranous; elytra 

 usually long. 

 G — Tarsi five-jointed, at least on one pair of tarsi. 

 H — Mentum large, quadrate: palpi distant at the base; habits 



usually aquatic (Hydrophilidae. ) 



HH— Mentum moderate or small; labial palpi approximate at the 

 base. 

 I— Ventral segments 1-3 connate. 

 J— Fifth joint of tarsi longer than the others combined ; claws 



large (Parnidae.) 



J J — Fifth joint of tarsi not longer than others combined; claws 



usual (Rhyssodidae.) 



II— Ventral segments free. 

 J— Anterior coxs. large, conical, prominent. 

 K— Posterior cox® more or less conical and prominent. 



L— Eyes finely granulated, sometimes absent (Silphidee.) 



LL— Eyes coarsely granulated (ScydmEenid®.) 



KK— Posterior cox® not prominent. 

 L— Antennae moderate m length, capitate; posterior cox® 

 sulcata for the thighs ; body usually scaly or pubescent. 



(Dermestidae.) 

 LL— Antennae long, slender, sometimes capillary; last ven- 

 tral segment elongate ; tarsi long and slender. 



(Scaphidiid®.) 

 JJ— Anterior coxae conical, transverse, slightly proiiinent; 



prothorax strongly toothed on the sides (Derodontidae.) 



JJ J— Anterior coxae not prominent. 

 K — Anterior coxa3 rounded or oval. 

 L— Posterior coxiE not sulcate for the reception of the 

 thighs. 



M— Posterior coxae contiguous (Phalacridae. ) 



MM— Posterior coxa3 separated. 



N— First ventral segment more elongated (PtinidiE.) 



NN— Ventral segments sub-equal. 

 0— Middle coxal cavities open externally. . .(Cucujldae.) 



