158 , [December, 



At page 14 ante I have adverted to Dr. Signoret's remark re- 

 specting the scales of the $ of Lecanium genevense and L. prunastri, 

 to the effect that the latter exhibit a rugosity which is not found in 

 the former, and hence I was inclined to believe that some scales I had 

 found on hawthorn, and which had this character, were those of the 

 latter. I am now of opinion that this rugosity is not to be relied 

 upon as a specific character, for I find it exists normally in the male 

 scales of all the species I have found, but that it often gets abraded 

 by adventitious circumstances, leaving the scale quite smooth, or it 

 becomes removed only in part. The male scale of all the species has 

 on its summit a raised oval ring ; on this the minute tubercles forming 

 a coronet are fixed, and when they are removed the smooth ring re- 

 mains. I apprehend the scales of L. prunastri have the same form of 

 coronet, but as I have not been fortunate enough to find any on the 

 sloe, I cannot say if they differ in any way from those having a like 

 form found on the hawthorn, such as I have indicated, nor can it be 

 stated with certainty if the species be distinct from L. genevense, for 

 it does not appear that the ^ imago of L. prunastri is known. In the 

 meantime L. prunastri is not to be reckoned as a British species ; its 

 distinctness also remains to be proved. 



I have now the following species found in Britain : — 

 Lecanium aceris, Auct., from sycamore, ^ and ? scales, ^ imago reared. 

 L. cesculi, Koll., from horse-chestnut, <J and $ scales, $ imago reared. 

 L. pyri, Schrk., from pear and apple, S a^^d ? scales, S imago reared. 

 L. genevense, Targ.-Tozz., from hawthorn, $ and ? scales, <? imago reared. 

 L. coryli, Linn., from hazel, $ and ^ scales, J imago reared. 

 L. tilice, Linn., from lime trees, $ scales. 

 L. caprcEcB, Linn., from willows, $ and $ scales. 

 L. rosarum, Snell. v. Yollenh., from cultivated roses, $ scales. 

 L. persiccB, Linn., from peach trees, ^ scales. 



ditto ?, from plum trees, ? scales, <? imago. 

 L. rihis, A. Fitch, on red currant and gooseberry bushes, ? scales only. I have 



never been able to find a male in any stage of life, although the scales are very 



abundant. The species is probably agamous, like L. hesperidum. 

 L. ?, S and $ scales on cherry trees (Prunus cerasus). The perfected 



males died in the scales. 



L. ?, <? and ? scales on laurel {Prunus laurocerasus) . No males came out. 



lEriopeltis festuccB, Fonsc, on Festuca bromoides, near Plymouth (Bignell). 

 Pulvinaria oxyacantha, Linn., on hawthorn, one example. The species is easily 



recognised by the white cottony pad exuding from under the flattened scale. 



Eeaumur's figure of the scale is more regularly cordate than my example. 

 Mytilaspis pomorum, Bouche, abundant on apple trees. 



From the terminal shoot of a young oak tree at Tunbridge Wells, Mr. G-. S. 

 Saunders sends me some round, lenticular, yellowish scales, which, in some respects, 

 agree with the description of Lecanium Emerici, but those scales occur not on 

 Quercus rohur. 



