ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 381 



such, for there is no power of orientation except under the influence of 

 some of the various stimuH ah'eady referred to. 



Structure of Recurvaria nanella.* — A. Mignone gives a detailed 

 account of the external features, appendages, and genital apparatus of 

 this small moth. 



B. Myriopoda. 



Poison Glands and Salivary Glands of Centipedes.f — J. W. Corn- 

 wall describes these in some Indian Scolopendrids, species of Ethmo- 

 stigmus, Rhysida and Otostigmus. The orifice of the venom duct is oval 

 and lies on the dorsal surface of the poison-claw, nearer the greater 

 curvature and at a little distance from the apex. Besides the venom 

 glands there are two pairs of salivary glands. There is also a third 

 pair of glands in the fatty body laterally and somewhat dorsally to the 

 salivary glands. Imbedded in the ventro-lateral fatty body there are 

 what seem to be ductless hfemopoietic organs. Incidentally the author 

 describes the reproductive organs. 



The toxic action of the venom is relatively low and is of secondary 

 importance. For the author is inclined to think that the main function 

 of the poison glands is to secrete digestive ferments. Extract of the 

 salivary and the third glands contains lysins, which are selective, 

 besides anticoagulin, diastase, invertase and proteolytic enzymes. 



5- Arachnida. 



Hydracarina from Strathearn.| — W. Williamson reports on a 

 collection of Hydracarina which he made in the neighbourhood of 

 Comrie. The most noteworthy capture was Lehertia angulata Sig Thor, 

 not previously known to occur within the British area, and supposed to 

 be restricted to Norway. The hitherto unknown nymph was found, and 

 is carefully described. 



Colour of Huitfeldtia rectipes.§ — W. Williamson has a note on 

 the colour of this Hydracarine, which was first recorded from Norway, 

 then from Orkney, and now from the North of England. From 

 information supplied by C. D. Soar the author states that the colour 

 (hitherto undescribed, since the records were from preserved material) 

 is an orange-brown with brown markings. 



Revision of Analgesinse.p — E. L. Trouessart discusses the taxonomy 

 of these plumicolous Sarcoptids. They differ from ordinary itch-mites 

 in being restricted to birds, in not sucking the serum of the blood, in 

 not causing itch, and in not having poisonous saliva. They feed on 



* Rend. Accad. Lincei Roma, xxv. (1916) pp. 343-9, 423-8 (2 flgs.). 



t Indian Journ. Med. Research, iii. (1916) pp. 541-57 (5 pis.). 



X Scottish Naturalist, 1916, pp. 89-91. 



§ Scottish Naturalist, 1916, p. 92. 



li Bull. Soc. Zool. France, xl. (1916) pp. 207-23. 



