94 PE.ui. 



In the earlier part of this paper, I have particularly drawn attention 

 to the subject of the facilities now given for scientific identification of 

 the Gall Mites, or Phytoptidfe, as I believe that this meets a great 

 need for all who have to teach or who are consulted on the nature of 

 these '* Mites," or the injuries they cause. For common use in garden 

 or field work, the nature of the diseased growth must necessarily be 

 the distinguishing mark of the kind of attack ; but we have greatly 

 needed some work of reference from which those who wished to know 

 all concerning these Mites (as classification of sub-families and dis- 

 tinctions of genera, and also complete details regarding distinctions of 

 species so far as at present published, in addition to life-history of the 

 family) could tell, or be told, all that can be needed. 



There are many works embodying much useful information on the 

 Mites, and on the results and means of prevention of some of the 

 infestations, and amongst those easily accessible to all here, and very 

 serviceable, both in its short descriptions of gall, or diseased growth, 

 caused by Phytoptidse, and also in its masterly sketch of the rise and 

 progress of Phytoptal discovery and observation up to date of publica- 

 tion, about seventeen years ago, is the paper compiled by Andrew 

 Murray, F.L.S., given at pp. 331 — 374 of the octavo volume entitled 

 'Aptera' (Chapman & Hall, Piccadilly, London). In this, at p. 346, 

 will be found a magnified figure of a Phytoptus, and still more greatly 

 magnified figure of the anterior extremity, with its two pairs of legs, 

 and " feather-bristle " claw. These, after figures by Dr. Franz Low, 

 the well-known observer of many Mite-galls and their Mite originators. 

 These so far as they go would be a great assistance to many who have 

 not the opportunity of studying the elaborate publications of technical 

 observers ; and so far as representation of the legs as definitely jointed 

 into coxa, femur, tibia, and two-jointed torsjfs, bearing a feathered claw, 

 are valuable aids to students. With regard to the side claw, it appears 

 to me very likely that that would now be differently represented with 

 the improved microscopic powers of the present day, but the feather- 

 claw is an important point. 



Those who wish to study the most recent publications on Phytoptal 

 observation in Austria, Italy, or France, will find a list of these in the 

 * Katalog der bisher beschrieben Gall-Milben ihrer Gallen und Nahr- 

 pflanzen, nebst angabe der einschlagigen Literatur und kritischen 

 Zusatzen. Zusammengestalt von Prof. Dr. Alfred Nalepa, in Linz-u- 

 Donau. Abdruck aus der Zoologischen Jahrbuchern (Gustav Fischer, 

 in Jena). 



The publications by Dr. Nalepa, from which I have quoted in the 

 preceding paper, are the ' Beitrage z. Syst. d. Phyt., Sitzsb.,' 1889, 

 98. = ' Beitrage zur Systematik der Phytopten, in : Sitzungsber, d. Kais 

 Akad. d. Wiss. in Wien,' 1889. Bd. 98, 1, 1889 ; also, ' Zur Syst. d. 



