ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 557 



seven formerly-described species, from the Seychelles. The new genus- 

 ( 'orefhromachil/s has a wonderful array of bristles on the lacinia of the 

 maxilla and Ijeneath the tip of each foot. Only two of the abdominal 

 segments have two pairs of exsertile vesicles. The new genus Micro- 

 paronella is primitive ; it combines the distinctive Paronelline characters 

 of the spring with the general aspect of an Entomobryine insect. Both, 

 these genera are peculiar to the Seychelles. A study of the Apterygota 

 gives some indication that the latest continental connexion of the archi- 

 pelago was with India and Ceylon rather than with Africa. 



5. Araclinida. 



Tropical Fowl-mite attacking Man.* — Stanley Hirst notes that a 

 blood-sucking mite which he described as Leiognathus morsitans sp. n.^ 

 from the domestic fowl in several parts of Africa, the Comoro Islands. 

 Mauritius, China, India, the Bahamas, and Columbia, is the same as that 

 described by Berlese as Liponyssus bursa (there appears to be a shp of 

 the pen in the tenth line of the paper) from Buenos Aires. Urich 

 reports the mite from Trinidad ; Cleland from Sydney. Hirst has pre- 

 viously recorded two cases of the mite attacking man ; Cleland records 

 the same from Sydney. The wide distribution of L. bursa is possibly 

 due to this mite being carried about by the common sparrow. It seems 

 that the European fowl-mite {Dermanyssus yalUnse) does not thrive in 

 tropical and sub-tropical countries. 



False Scorpions of Britain and Ireland-f— H. Wallis Kew adds tO' 

 his previous synopsis a description of Ghelifer (Ghernes) wider i Koch,, 

 from Sherwood Forest, etc. ; of Ghelifer (Ghernes) powelU sp. n., from 

 Surrey, etc. ; and of Ghthoniiis halberti sp. n., from near Dublin. The 

 list for Britain and Ireland includes thirteen species of Ghelifer, Ghei- 

 ridium museorum, five of Obisium, and five of Ghthonius ; of the twenty- 

 four. Ireland has fourteen. 



e. Crustacea. 



Orientation to Light in Porc:llio scaber.J — H. B. Torrey and 

 G. P. Havs have studied the role of "random movements" in the 

 orientation of P. scaber to light. Their experiments led them to- 

 consider every orienting reaction phototropic whose direction is predict- 

 able in that it bears a definite relation to the source of light. Euglena 

 viridis, species of blow-fly larvae and earthworms, and F. scaber exhibit 

 reactions of this type, which is not satisfactorily interpreted by the 

 method of trial. PorceUio is easily guided in any desired direction by 

 changing the direction of light falling on it from behind. The first 

 locomotor movement made by PorceUio, when exposed suddenly to- 



* Ann. Nat. Hist., xviii. (1916) pp. 243-4. 



t Proc. Roy. Irish Acad., xxxiii. (1916) pp. 71-85 (3 figs.). 



X Journ. Animal Behaviour, iv. (1914) pp. 110-20. 



