ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 173 



long, known as the " rains insect." It is only to be found for a few 

 weeks in the year at the beginning of the rainy season. On pressure it 

 exudes a deep red oil, which is used medically externally as a counter- 

 irritant. It appears to have no such properties, and its supposed 

 efficacy as a medicine is probably purely imaginary, and due to its 

 colour. The oil is principally composed of myristodiolein. There is 

 possibly also present an alcohol of high molecular weight belonging to 

 the fatty series of carbon compounds. 



7. Myriopoda. 



Spermatogenesis of Scolopendra heros.* — M. W. Blackman gives a 

 very full account of the spermatogonia, the spermatocytes and their 

 maturation divisions, and the metamorphosis of the spermatids. Nuclear 

 and cytoplasmic structures are discussed in detail. 



Spermatogenesis in Myriopoda.j — M. W. Blackman gives an account 

 of the karyosphere and nucleolus in the spermatocytes of Scolopendra 

 subspinipes. In these there is a large plasmosoma, or true nucleolus, 

 during stages of mitotic inactivity, whose presence seems to necessitate 

 a specific variation in the behaviour of the chromatin. Notwithstand- 

 ing this variation, the process is essentially similar to that previously 

 described in S. heros. 



5. Arachnida. 



Ovarian Eggs of Spiders.J — E. Strand gives a series of notes with 

 reference to various species of spiders, upon the growth of the egg and 

 the behaviour of the nuclei. The paper is preliminary to a more 

 detailed communication. 



Classification of Spiders.§— Fr. Dahl discusses the systematic 

 relationships of the sub-orders of Aranese, and gives a useful diagnostic 

 key, showing the salient features distinctive of the sub-orders Verticulatae, 

 Tetrapneumones, Oligotrichia?, Chalinurse, Stichotrichias, Polytrichia?, 

 Tubitelae, Laterigradae, Saltigradse, and Apneumones. 



Spinning Mite on Conifers. || — A. Jacobi discusses the damage done 

 to conifers by Tetranychus ununguis sp. n., a new spinning mite marked 

 by the presence of a true claw on the last joint of the foot. It is kept 

 down by small black spiders and numerous Coccinellidse, of the genus 

 Exochomus, and may be successfully dealt with by using a dilute soap 

 solution. 



South American Pseudoscorpions.1T — E. Ellingsen describes from 

 the collection of F. Silvestri examples of the genera Ghelifer, Ideobisium, 

 Chthonius. Several new species are included in the survey. 



* Bull. Mus. Compar. Zool., xlviii. (1905) pp. 1-138 (9 pis.), 

 t Proc. Amer. Acad. Arts, and Sci. xli. (1905) pp. 331-44 (1 pi.). 

 % Jena Zeitschr. xxxiii. (1905) pp. 487-96 (1 pi.). 

 § Zool. Anzeig., xxix. (1905) pp. 614-19. 



|| Naturwiss. Zeitschr. Land. Porstw., iii. (1905) pp. 239-47 (2 figs.). See also 

 Zool. Zentralbl., xii. (1905) pp. 573-4. 

 If Zool. Anzeig., xxix. (1905) pp. 323-8. 



