154 fJuiy. 



nevertheless, the little patches o£ the Neptlcula were not only green 

 but juicy, and to all intents and purposes alive. Yet they must have 

 been lying for days upon the short turf, resisting alike the great heat 

 and the drought, and by the force of their vitality storing up from 

 the dews at night moisture enough to meet the wastes of the day. 



Here I will leave the question. Beyond noting some of the con- 

 ditions under which it occurs, I feel I have done but little to elucidate 

 it. It is a matter so intimately bound up with the physiology of 

 plant life in health and disease ; moreover, my opportunities of con- 

 sulting recent authorities on these subjects are so scant, and any 

 original investigations on my own part so out of the question, that it 

 must remain for some one else to remove it from the domain of 

 hypothesis to that of fact. 



Tarrington, Ledbury, 



ON TWO SPECIES OF ALEURODES FEOM DORSET. 

 BY J. W, nOTJGLAS, F.E.S. 



Mr. C. W. Dale has sent specimens in the imago state of two 

 species of Aleurodes, which he has quite recently taken at Grianvilles 

 Wootton. One of them (three specimens) is certainly A. spircece, 

 Doug., but it comes from bramble, and from this it might be suspected 

 that it is A. rubi, Sign. (Ess. sur les Aleurodes), but there are some 

 material differences that militate against such an opinion. In the 

 larva state rubi has {sec. Signoret) a series of long hairs on the dorsum 

 (his pi. ix, fig. 4), but such are quite w a,ntmg in spircece ; and the 

 remarkable dorsal tubercles of spir<s<s are not present in ruhi. Of the 

 imago of ruhi, Signoret merely says that there is a single black spot 

 in each wing, making no remark on any peculiarities of its form, such 

 as exist in spirtsce {cf. p. 74, ante), and which, if Signoret had seen 

 in his species, he would surely have noticed. These considerations 

 weighed with me when I described A. spiraece, and 1 still think go to 

 show a distinction of species. 



A. AVELLAN^, Sign. 

 Signoret says : " This species is very near to A. quercus ; like that it is trans- 

 parent, only beginning to become rather opaque at the moment when it passes into 

 the nymph-state. The perfect insect I have not been able to study well, having 

 found only a mutilated individual, and still doubting if it be that of the nut-tree, as 

 it may have proceeded from some of the numerous oaks around. 



