502 



FAMILY XV.— CORYLOPHIDJE. 



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

 ered as belonging to a subdivision of the CoecinellidcT, 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 Coecinel- 

 lida^ but also to the Silphidag, so that they are assigned a place be- 

 tween those two families. 



The principal literature treating of the family is as follows : 



LeConte.— 1 Synopsis of the Corylophi," in Proc. Phil. Acad. 

 Nat, Sci., VI. 1852, 141-145. 



Casey.— 1 ' Synopsis of the Corylophiche, " in Journ. N. Y. Ent. 

 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- Corylophid*. (After Casey.) States. Of these eight S pe- 



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

 number of others may occur. 



KEY TO INDIANA GENERA OF COBYLOPHID^E. 



a. Antennae 10- or 1 1-jointed ; thorax hood-like, completely concealing the 

 head. 



b. Body rounded, convex, glabrous; front coxa- long and narrow, en- 

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

 elongate but shorter than the second. 

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

 which is evenly rounded and strongly descending; post coxal 

 plates large with rounded outline; labrum rounded and sub- 

 quadrate. I. CORYLOPHODES. 



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

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

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

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



hl>. Body oblong or oval and pubescent ; front coxae oblong or globular. 

 (I Hind angles of thorax distinctly prolonged backwards and acute; 

 antennae 10-jointed (Fig. ISO. No. 3) ; front coxa? short, oblong. 



III. Sericoderus. 



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

 coxae larger, less deeply imbedded; globular. 

 e. Antenna' n -jointed: presternum well developed in front of ooxre. 

 f. Body elongate, subdepressed. the sides subparallel ; basal joint 

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

 bined. Sacium. 



