ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 481 



Hop Flea-beetle.* — Fr. Tolg gives a detailed account of the external 

 structure of the larva and pupa of PsylUodes attemiata Koch, the 

 extremely injurious flea-beetle of hops and hemp. He also discusses 

 the life-history and preventive measures. 



Fr. Heikertinger f gives a detailed account of the adult, describing 

 the head with its antennae and mouth-parts, the thorax with its legs and 

 wings, the abdomen and the external genital apparatus. The feeding 

 habits, the jumping movements, the year's life, the damage done, and 

 remedial measures are discussed. 



Structure of Ovipositor in Dytiscidse.J — A. G. Boving has made 

 a detailed study of the varied structure of the ovipositor and of the 

 associated musculature. He does not think that there ai;e as yet 

 sufficient data for determining whether the ovipositors can be brought 

 into line with those of other insects. There is need for a morpho- 

 logical revision of the ovipositors of insects, and particular attention 

 must be paid to two questions : (1) whether the elements belong to one 

 uro-segment or to more than one ; and (2) whether the elements can all 

 be referred to primary segmental sclerites, or whether some of them 

 must be regarded as parts secondarily added on. He distinguishes 

 six types of ovipositor in Dytiscidse, and confirms the conclusion of 

 Weseuberg-Lund that these are adapted to the different ways in which 

 oviposition takes place. 



Development of Strepsiptera.§ — Paul Rosch has studied the post- 

 embryonic development of Xenos rossii, which occurs as a parasite in 

 the wasp Polistes gallica. He deals in particular with the appendages, 

 the eye, the supra-oesophageal ganglia, and the mesenteron. 



The primordium of an appendage is a round thickening of the 

 hypodermis ; it acquires a cavity and an annular groove at its base ; 

 migrant mesoderm cells occur in the lumen. 



The complex eye arises from a lateral thickening of the single- 

 layered hypodermis of the head. A retina is formed first, then by 

 secondary overgrowth of hypodermis cells the cornea-forming layer. 

 The details of the subsequent differentiation are given. 



The supra-oesophageal ganglion consists in the earliest larval stages 

 of two oblong portions symmetrically disposed in relation to the long 

 axis. Each half gives off laterally a nerve-fibre, whose distal end 

 abuts on the hypodermis at the position where the complex-eye appears. 



The mid-gut wall in the youngest larval stages consists of a single 

 layer of large homogeneous glandular cells, with small indifferent cells 

 between. Of the latter, some form larval glandular cells, and others the 

 imaginal epithelial mother-cells. 



Mouth-parts of Mallophaga. || — Bruce F. Cummings notes that the 

 Mallophaga are for the most part such small parasites that the dis- 



'^ Verb. Zool. Bot. Ges. Wien, Ixiii. (1913) pp. 1-25 (15 figs.). 



t Yerh. Zool. Bot. Ges. Wien, Ixiii. (1913) pp. 98-136 (20 figs.). 



X Internat. Rev. Hydrobiol., 1913, Biol. Suppl., ser. 5, pp. 1-28 (6 pis.). 



§ Jen. Zeitschr. Naturw., i. (1913) pp. 97-146 (4 pis. and 8 figs.). 



II Proc. Zool. Soc, 1913, pp. 128-41 (9 figs.). 



Oct. loth, 1913 2 K 



