. Coleoptera : general introduction and Cicindelidae and Paussidae. and tarsi furnished with swimming hairs, as arule broadened and f attened; abdomen with six visible ventralsegments. The great authority on this group is Dr. Sharp, and his exhaustivework On Aquatic Carnivorous Coleoptera or Dytiscid^u,published in the Transactions of the Koyal Dublin Society (vol. ii,series 2, 1880-2), is by far the most important that has yet. Fig.*27.—Bytiscus (Troy its) limbatus and the under surface of the fronttarsus (enlarged). appeared. He divides the into two great series, theDytisci fragme
. Coleoptera : general introduction and Cicindelidae and Paussidae. and tarsi furnished with swimming hairs, as arule broadened and f attened; abdomen with six visible ventralsegments. The great authority on this group is Dr. Sharp, and his exhaustivework On Aquatic Carnivorous Coleoptera or Dytiscid^u,published in the Transactions of the Koyal Dublin Society (vol. ii,series 2, 1880-2), is by far the most important that has yet. Fig.*27.—Bytiscus (Troy its) limbatus and the under surface of the fronttarsus (enlarged). appeared. He divides the into two great series, theDytisci fragmentati in which the metathoracic episternum doesnot reach the middle coxal cavity, and the Dytisci complicati inwhich the metathoracic episternum reaches that cavity. Excluding the Hygrobiidje or Pelobiid^: and the AMPHizoiDiE,which Dr. Sharp now considers to be separate families, we havethe following table, drawn up by him ; the divisions, however, aswill be seen, are of very different values. 63 I. Dytiscifragmentati. i. Greatest anterior extension of the hind coxa near the middle (longitudinally) of the body;metasternum more or lesspointed in the middlebehind, and not marked by a transversesuture ii. Greatest anterior extension of the hind coxa nearer to the epipleura than to the medial lineof the body. 1. Prosternal process not reaching the meta- sternum 2. Prosternal process reaching the metasternum . I
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbeetles, bookyear1912
