. An illustrated descriptive catalogue of the coleoptera or beetles (exclusive of the Rhynchophora) known to occur in Indiana : with bibliography and descriptions of new species . Beetles. 'rilE PEEDACEOI'S niTTXG BEETLES. 207 KEY TO (llf DYTISCJDiE. «â Episternum of metatliorax not reaching the middle coxal cavity. (Fig. 106.) Subfamily I. Feagmentati, p. 207. «". Episternum of metathorax reaching the middle coxal cavity. (Fig. 107.) Subfamily II. Complicati, p. 210. In the accompanying cuts, Fig. 106 rep- resents a diagram of a portion of the under surface of Laccophilus,
. An illustrated descriptive catalogue of the coleoptera or beetles (exclusive of the Rhynchophora) known to occur in Indiana : with bibliography and descriptions of new species . Beetles. 'rilE PEEDACEOI'S niTTXG BEETLES. 207 KEY TO (llf DYTISCJDiE. «â Episternum of metatliorax not reaching the middle coxal cavity. (Fig. 106.) Subfamily I. Feagmentati, p. 207. «". Episternum of metathorax reaching the middle coxal cavity. (Fig. 107.) Subfamily II. Complicati, p. 210. In the accompanying cuts, Fig. 106 rep- resents a diagram of a portion of the under surface of Laccophilus, which belongs to the subfamily Fragmeiifafi, cc being the middle coxal cavity. It will be seen that '*^' the mesosternal epimeron {ms. epm.) ar- ticulates at its inner end with the meta- sternum {)iit.). and thus cuts off the metasternal episternum {mt. eps.) from the coxal cavity. In Fig. 107, however, which is a diagram of similar parts of "*" loe^ io7. ColymhUes of the subfamily Complicati, (After wickham.) the mesosternal epimeron does not articulate with the metasternum, and thus allows the episternum of the latter to reach the cavity. These features are not, as a rule, difficult to make out, and form the basis of the modern classification of the family, by Dr. Sharp. Subfamily I. FRAGMENTATI. The North American members of this subfamily are divided among two tribes, both of which are represented in the Indiana fauna. In all the species the scutellum is invisible. KEY TO TKIBES OP FRAGMENTATI. a. Hind coxits longer near the middle of the body; presternum dilated be- hind, truncate or nearly so. Tribe I. Notebini, p. 207. aa. Hind eox:e longer near the sides of the liorty; prosternal process coni- liressed. reaching the metasternum. Tribe II. Laccophilini, p. 209, Tribe I. NOTEKINI. The mcmliers of this tribe are all small beetles having the body convex, obtuse in front and pointed behind; front and middle tarsi ; apex of front ti
Size: 1405px × 1778px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbeetles, bookyear1910
