502 FAMILY XV. CORYLOPIIID.'E. 



The members of this family have been by most authors consid- 

 ered as belonging to a subdivision of the Coecinellidse, but the form 

 of the mandibles and the structure of the tarsi are sufficient to 

 separate them. Moreover, they differ widely in food-habits. How- 

 ever, they are related closely in structure not only to the Coccinel- 

 lida? but also to the Silphida\ so that thoy are assigned a place be- 

 tween those two families. 



The principal literature treating of the family is as follows: 



LcConte. — "Synopsis of the Corylophi," in Proe. Phil. Acad. 



Nat. Sci., VI, 1852, 14H45. 

 Casey. — "h'yuopsis of the Corylophidfe," in Journ. N. Y. But. 

 Soc., VIII, 1900, 60-75. 



About 200 species of the 

 family are known. Casey 

 in his Synopsis lists 54 spe- 

 cies, divided among ten 

 genera, from the United 



Fig. 180. Antenna: of CoTi/JopAifc (After Casey.) StatCS. Of thcSe eight Spe- 



cies, belonging to five genera, have been taken in Indiana, while a 

 number of others may occur. 



KEY TO INDIANA GENERA OF COEYLOPHID.T:. 



u.. Antennae 10- or tl-.iointed; thorax hood-like, completely concealing the 

 head. 

 6. Body rounded, convex, glabrous; front coxse long and narrow, en- 

 closed within deep cavities; antenna^ 11-jointed, the third joint 

 elongate but shorter than the second. 

 c. Head very deeply inserted within the thorax, the front margin oi' 

 which is evenly rounded and strongly descending; post coxal 

 plates large with rounded outline; labrum rounded and sub- 

 quadrate. I. CORYLOPHODES. 

 Of. Head less concealed by the overhanging margin of the thorax, but 

 not visible from above; pctst coxal plates very short; labrum 

 small, triangular, its apex, acuminate ; tarsi short, dilated ; hind 

 angles of thorax acute, feebly prolonged. II. Gronevis. 

 bh. Body oblong or oval and pubescent ; front coxte oblong or globular. 

 <1. Hind angles of thorax distinctly prolonged backwards and acute; 

 antenna^ tO-.iointed (Pig. 180, No. 3) ; front coxa» short, oblong. 



III. Sericoderus. 

 dd. Hind angles of thorax not prolonged backwards, rectangular ; front 

 cox;c larger, less deeply imbedded ; globular. 

 e. Antenna' ]l-.ininted; presternum well developed in front of coxa'. 

 /. I'.ddy eli)ni;,ili', sul)depressed, the sides subparallel ; basal joint 

 <ir hind tarsi short, scarcely as long as the next two com- 

 bined. Sacidm. 



