550 FAMILY XIX. COLYDIID^. 



In habits the Colydiida are in part carnivorous, as the larva? of 

 certain genera are known to feed upon those of other small, wood- 

 boring forms. About 600 species are known, 70 of which are from 

 North America. These are divided among numerous tribes and 

 genera, many of the latter containing but a single species. The only 

 paper which treats of the family as a whole is by 



#>,..__ Synopsis of the Colydiidie of the U. S.," in Proc. 

 Amer. Phil.'soc,, XVI 1. 1878. 555-592. 



Other short papers by Casey on isolated species have appeared 

 in the Annals of the N. Y. Academy of Science. Fourteen species 

 of the family, distributed among 11 genera, have been taken in 

 Indiana. Several other genera are doubtless represented in the 

 State, and are included in the generic keys which follow: 



KEY TO INDIANA TRICES OF COLYDIID.E. 



ii. Antenna' inserted under a distinct frontal ridge; front coxa.' distant 



from the mesosternum. 

 />. Last joint of palpi not needle-shaped. 

 c. Front coxa? slightly separated. 



(1. First joint of tarsi short; form elongate or oval. 



Tribe I. SYNCIIITINI, p. .V.n. 

 (Id. First joint of tarsi longer than the second; form cylindrical. 



Tribe II. COLYDIINI, p. 55:>. 

 c<: Front coxa' widely separated: form elongate, subdepressed. 



c. Antenna' arising under a frontal margin: lirst ventral segment 

 not elongate; trochanters free. 



Tribe III. PYCNOMERINI, p. ~>~>'<. 



i'i'. Antenme free at base; first ventral segment elongate; trochanters 

 closely united to the femora. 



Tribe IV. BOTIIRIDERINT. p. 55(5. 



1>1>. Last joint of palpi needle-shaped: antenna? free at base; form short, 

 oval, depressed. Tribe V. CERYLONTNI. p. 557. 



an. Antenna? inserted on the front : trout coxa? inclosed behind by the meso- 

 sternum. Tribe VI. MT-R.MIDITNI. p. 557. 



Tribe I. SYXCHITINI. 



Elongate or oval species having the surface often ribbed and 

 more or less bristly; tarsi short, the first three joints subequal and 

 together not longer than fourth. The following genera are known 

 to be or should be represented in Indiana : 



KEY TO INDIANA fiENERA OF SYNCHITINI. 



n. Front cuxal cavities open behind. 

 '. Antenna' 10-jointed. club solid. 



c. Head beneath without antennal grooves. I. SYNCHITA 



