JOURNAL OF ENTOMOLOGY AND ZOOLOGY 115 



THE SOMBRE TWIG-PRUNER, THERCLADODES 

 KRAUSSI, AVHITE 



CLAUDE FULLER 



The Agricultural Journal of the Union of South Africa, 



Feb., 1913. 



This beetle attacks privet, jassamine, and olives, but has not 

 become much of a pest, as it can be rather easily controlled by 

 pruning. If olive growing were extensive, however, it would 

 probably cause trouble. 



The life of the larva is interesting. The egg is laid in a 



little cavity excavated about six inches from the end of the 



stem. As soon as the larva hatches, it bores up about one 



inch, then enlarges the cavity, turns around, and works down 



to between one and two inches below the site of the egg. It 



then backs up to the enlargement, turns around, and backs 



down to the bottom, where it remains for some days, then 



ascends for a little distance and girdles the twig, which breaks 



off. It then plugs up the hole and descends to the bottom of 



the burrow to moult. After moulting, the whole process is 



repeated, and it is repeated with each moult until the larva 



pupates. 



Mabel Guernsey. 



ABSORPTION UND SECRETION IM DARM VON 

 INSECTEN 



ALBRECHT STEUDEL 



Zool. Jhrb. Bd. XXXIII, Heft 2, 1913 



The most important conclusion is that there is a double 

 function for the intestinal epithelial cells wliieh are active, the 

 function of absorption and secretion. Many authors describe a 

 rest and a secretion stage. In Periplaneta and other insects 

 absorption takes place during the rest stage. In many if not 

 all insects the intestinal epithelium has this double function. 



