26 COLEOPTERA OF INDIANA. 



'/'/. Antenna? with the terminal joints forming a lamellate club com- 

 posed of movable plates cr leaves, capable of separation and 

 usually of accurate apposition; legs mure or less fossorial ; 

 tarsi five-jointed ; food variable, either decaying wood, duni: 

 carrion or foliage. Series IV. LAIIELTJCORNIA, p. 903. 



bb. Fourth and fifth tarsal joints firmly united, the fourth joint very 

 small, the tarsi therefore appearing but four-jointed ; sole usually 

 densely pubescent ; antennae filiform, rarely serrate or thickened 

 towards tip ; leaf-eaters or wood-borers. 



Series V. PHYTOPHAGA, p. 1005. 



aa. Front and middle tarsi five-jointed, hind tarsi four-jointed, the joints 

 usually slender and bare or at most sparsely haired or spinose ; 

 other characters and food habits very variable. 



Series VI. HETEKO.MIOKA. p. 1242. 



Series I. ADEPHAGA. 



The members of this series always have the mouth parts highly 

 developed, the outer lobe of the maxilla? being nearly always di- 

 vided into a two-jointed palpus, so that there appear to be six palpi. 

 Abdomen with the exposed segments one more in number at the 

 sides than along the middle, the number usually being five along the 

 middle and six at each side. They are for the most part active, pre- 

 daceous and carnivorous in habit. Five of the seven families com- 

 prising the series are represented in Indiana. 



KEY TO INDIANA FAMILIES OF ADEPHAGA. 



(/. Terrestrial species; antennae with at least the six outer joints pubes- 

 cent; inetasternum with an antecoxal piece, separated by a well 

 marked suture, reaching from one side to the other and extending 

 in a triangular process between the hind coxa?. 



l>. Antenna? inserted on the front above the base of the mandibles ; 

 inner lobe of the niaxilhe ending in a movable hook; eyes large 

 and prominent ; head vertical, wider than thorax. 



Family I. CICINDELID.*:. p. 1:7. 



1>I>. Antennae arising from the side of the head between the base of the 

 mandibles and the eyes; inner lobe of maxillae not ending in a 

 movable hook; eyes usually of moderate size; head horizontal 

 or slightly inclined, usually narrower than thorax. 



Family II. CABABID.E, p. oO. 



(/. Aquatic species; antennae destitute of pubescence; rnetasternuni (e^ 

 cept in Haliplidae) without an antecoxal piece but prolonged behind 

 in a triangular process. 

 c. Eyes two; antenna* slender and filiform or setaceous; abdomen 



with six segments. 

 d. Antennae ten-jointed; hind coxae prolonged as large plates ef 



ing the femora and a large part of the abdomen; hind legs not 

 formed for swimming. Family III. HALII>LIU ':, p. 1:00. 



