38 ' FAMILY IT. CAB ABID2E. 



from almost white to that of the perfect insect, and leaving the old 

 pupal skin behind the young beetle crawls forth to the shelter of 

 some object which will protect it by day, while at night it roams 

 freely in search of food or a mate with which to perpetuate its kind. 



About 13,000 species of Carabiche are known, more than 1,200 

 of which have been described from the different parts of the United 

 States. Of these 366 representing 73 genera have, up to the pres- 

 ent, been taken in Indiana, The principal papers treating of each 

 genus will be mentioned under the tribal or generic heading. For a 

 general classification of the family the student is referred to the fol- 

 lowing papers : 



LeConte.—' 'Notes on the Classification of the Carabida3 of the 

 United States/' in Trans. Amer. Phil. Soc, X, 1853, 363-403. 



7/ om .__<<On the Genera of Carabida3 with special reference to 

 the fauna of Boreal America," in Trans. Amer. Ent. Soc, 

 IX, 1881, pp. 91-196, pis. III-X. 



By Dr. Horn the Carabidae were divided into three subfamilies, 

 two of which are represented in Indiana. 



KEY TO INDIANA SUBFAMILIES OF CARABIDiE. 



a Middle coxal cavities not entirely enclosed by the 

 sterna alone, the epimeron of the mesosterniun 

 reaching the coxa on the outer side. (Fig. 26.) 



Subfamily I. Carabine, p. 38. 



aa Middle coxal cavities entirely enclosed by the sterna 

 the epimeron not reaching the coxa ; head without 

 (Aft 4, antennal grooves beneath and with one or more 



l. Coxal cavities; 2. distinct bristly hairs above the eyes. 



Epimeron; 3. Mesosterna; Subfamily II. HaRPALIN.E, p. 63. 



4. Metasterna. 



Subfamily I. CARABINAE. 



In this subfamily the epimera of the mesosteruum nearly equal 

 the episterna in size and reach the coxal cavities, forming a part of 

 their enclosing walls. The head has one or two large punctures 

 above each eve, each bearing a bristly hair ; sides of thorax usual y 

 with two similar punctures. Front tibi* cither entire obliquely 

 grooved or emarginate. The subfamily is divided into 15 tribes, ot 

 which but six' arc represented in Indiana. 



KEY TO INDIANA TRIBES OF CARABIN.E. 



a. Front coxal cavities oiien behind. 



h liind eoxas separated; labrum deeply forked. 



) 



