40 SUMMARY OF CUKRENT RESEARCHES RELATING TO 



shaped funnel and tracheae which can be extended from the posterior 

 end of the body. 



Spermatogenesis in Locusta viridissima.* — H. Otte describes the 

 differentiation of the mature spermatozoon — an intricate affair. The 

 anchor-shaped apical piece is due to the idiozome ; the bilaterally- 

 symmetrical head includes in its interior an " internal body " due to 

 co-operation of the products of the proximal double-central-corpuscle : 

 in half of the spermatozoa, the head also includes an accessory chromo- 

 some. Below the head is a short region due to the proximal double- 

 central-corpuscle — the centrosoraal connecting piece. Then follows a 

 long median piece, which consists of the intra-cellular axial filament 

 plus the mitochondrial envelope. The head, connecting piece, and 

 median piece are enveloped in a delicate cytoplasmic envelope. At the 

 end of the median piece there is the distal central corpuscle (invisible in 

 the mature spermatozoon), and then there is a delicate terminal thread 

 due to the extra-cellular axial filament. There seems no end to these 

 minutiae. 



Tympanal Sensory Apparatus of Orthoptera.t — Josef Schwabe 

 describes in full detail the structure of the tympanal apparatus, the 

 associated musculature and nerves, and the nervous end-organs. His 

 elaborate memoir does at last something like justice to these intricate 

 mechanisms. 



Injurious Insects in Ireland 4 — George H. Carpenter reports on 

 various injurious insects and other animals observed in Ireland during 

 the year 1905 ; e.g., the cabbage aphis (Aphis brassicce), the diamond- 

 back moth {PlutpJla cruciferarum), the winter moth (Oheimatobia 

 hrunuita), the December moth {Pcecilocampa populi), the pith moth 

 {Blastodacna vinolenteUa), the rice weevil {Calandra oryzm), and the 

 mottled willow moth {Garadrina quadr /punctata) — the last infesting a 

 dwelling house ! The stem eelworm ( Tz/JenchHs devastatrix), the straw- 

 berry eelworm {Aphelenchus fragarm), the field slug {At/riolimax 

 agrestis), and other injurious animals outside the class of insects are also 

 discussed. 



Large Larch Saw-Fly.§ — R. Stewart MacDougall gives an account of 

 Nematus erichsoN.i, wliich in recent years has been causing serious injury 

 to larch trees in Cumberland. To aid in identification, a description of 

 the adult, caterpillar, cocoon, egg, and excrement is given, as well as a 

 statement of the habits and life-history of this insect. 



Studies on Thysanura.|| — K. Escherich continues his studies on 

 Thysanura, and reports a number of interesting new forms, which are 

 chiefly termitophilous Lepismatidge. He describes as new genera, Hema- 

 telura, a transition type between Nicoletia and Atelura ; also Flatystylea 

 and Assmuihia, both with very striking sexual dimorphism. 



* Zool. Anzeig., xxx. (1906) pp. 750-4. 



+ Zoologica, XX. heft 50 (1906) pp. 1-154 (5 pis. and 17 figs.). 



J Econ. Proc. R. Dublin Soc, i. (1906) part 8, pp. 321-44 (5 pis. and 8 figs.). 



§ Journ. Board of Agriculture, xiii. (1906) pp. 385-94. 



II Zool. Anzeig., xxx. (1906) pp. 737-49 (32 figs.). 



