26 [July, 



Pulvinaria, before the period of oviposition, then they might easily 

 pass as a Lecanium. So also of the other Fulvinariee he mentions. 

 At any rate, with such reservations, the subject deserves investigation, 

 for there may well be not so many species of Lecanium or Pulvinaria 

 as is believed. Foerster's contention is that while different though 

 similar species may feed on one kind of tree and get one name, yet, 

 on the other hand, one species may feed on different kinds of trees 

 and thus get several names. 



Targioni-Tozzetti, in his " Catalogus," 1868, places together as 

 one species (under the name Lecanium ulmi, Walker), without any 

 mark of doubt, and apparently without knowing what Foerster had 

 proposed. Coccus ulmi, Geoifr., Coccus coryli, Linn., Chermes coryJi 

 hcmisplicericus, Geoffr., Coccus tilice, Linn., Chermes tilice hemisjyJicBricus, 

 Geoffr., and Calypticus Jcevis, Costa, but leaving Leca?iium acei'is = 

 Coccus aceris, Modeer, Fab., Gmel., Curtis, as a distinct species. Now, 

 Walker (List of Hemipterous Insects in Brit. Mus., iv [1852], p. 1074, 

 No. 33), merely cites Coccus ulmi, Linne, without giving any descrip- 

 tion or reference to the British Museum collection, and does not put 

 any other reputed species as equivalent to it, quoting only the ulmi 

 of the various authors who have described or noticed the species of 

 that name ; so that the reference by Targioni-Tozzetti to the Lecanium 

 ulmi of Walker is misleading and futile, but this does not invalidate 

 his opinion of the unity of the reputed species he mentions. 



Signoret describes as distinct species, L. aceris, cesculi, corni, 

 coryli, yenevcnse, fyri, and tilice, allowing that they are much alike, but 

 with certain small differences in the scale of the female or in the 

 imago of the male deemed of specific value, and stating that they 

 have in common on the " derme " of the scale of the female a micro- 

 scopic tesselation. 



The solution of these and other problems, ut infra, is within the 

 reach of the younger men of this generation, but scarcely in the 

 range of my own probabilities, which are within measurable distance 

 of an end. Time is on their side but not on mine, for, as the French 

 say, " Quand on est mort c' est pour long temps.'''' 



In the " Jahrbiicher des nassauischen Vereins fiir Naturkunde," 

 1884, Dr. Eudolph Goethe has an article on the Coccidce affecting 

 fruit trees and vines in the Rhine district, illustrated with three 

 plates, and the paper is in several respects of interest to us, as most 

 of the species have been, or may be, found in Britain. 



I note the following: — 





