THE LAMELIjICOEN BEETLES 



KEY TO SUBFAlIIl.ir« OF SC'AKAB.EID.l!;. 



911 



a. Abdomimil spiracles sitii.-ited in a line on the meinbnutc connecting the 

 dorsal and ventral horn-like plates, the last one, lilse the others, 

 covered by the elytra ; upper surface Of head usually much dilated 

 on the front and sides; dung eating or skin beetles. 



Subfamily I. Laparosticti, p. 911. 

 tia. Abdominal spiracles, except the front one or two, not situated on the 

 membrane above mentioned, the last one usually visible behind the 

 elytra ; upper surface of head rarely dilated ; vegetable feeding spe- 

 cies. 

 6. Abdominal spiracles in part situated on the superior portion of the 

 ventral segments, the rows of spiracles feebly diverging. 



.Subfamily II. Melolonthtn.e. p. 947. 



66. Abdominal spiracles (excepting the three front ones) situated on the 



dorsal portion of the ventral segments, forming two rows which 



diverge strongly. Subfamily III. Pleurosticti, p. 9S0. 



Subfamily I. LAPAROSTICTI. 



In addition to the characters above given the Laparosticti, or 

 Coprophaga, as they are sometimes called, are distinguished by hav- 

 ing the suture separating the elypeus from the head distinct, and 

 not transverse but extending upward to^vard the vertex; club of 

 antennffi consisting of only three joints. They all live on decompos- 

 ing matter, most of them in duug or fungi. The subfamily is di- 

 vided into eight tribe.s, six of which are represented in- Indiana. 



KEY TO INDIANA TRIBES OF LAPAHOSTIOTI. 



a. Abdomen with six visible ventral segments. 



6. Autenufe with eight to ten joints ; mandibles concealed by the ely- 

 peus except in the genera JigiaUa-anA Ocliodwiis. 

 c. Hind tibije with a single terminal spur (except in Ganthon nigri- 

 cornis) ; form shorter, rounded; end of the abdomen exposed. 



Tribe I. Coprini, p. 912. 

 cc. Hind tibiiP with two spurs ; abdomen wholly covered by elytra ; 

 size usually small. 

 (1. AnteimsB O-jointed; form oblong-convex or subcylindrical. 



Tribe* II. Aphodiini, p. 920. 

 (/(/. -intenmie I0-,1oiuted; form oval, convex. 



Tribe III. Oephnini, p. 935. 

 66. AntenuiP ll-.1ointed ; mandibles prominent, visible from above. 



Tribe 1\. Geotrupini, p. 93G. 

 iKt. Abdomen with five visible ventral segments. 



e. Body partially contractile, rounded, smooth, shining; scutellum rela- 

 tively large. Tribe V. Acanthocerini, p. 940. 

 cc. Body not contractile, olilong, convex, roughly sculptured; scutellum 

 small. Tribo VI. Tkogini, p. 941. 

 [58—23402] 



