1921.] 



151 



Phenacoccus acej-is Sign. — On stems of poach-trees (under glass) ; 

 Lyme Regis, Dorset, 12.iv.l920. The insects were then fully grown, 

 and had constructed their ovisacs by the middle of the month ; while the 

 same species, on gorse, in the open, was still in the nymphal stage. 

 I can find no previous record of the occurrence of Phcii. aceris upon 

 peach-trees. 



Pseudococcus (jahaiii Green. — On Ceanutliiis sp. (apparently 

 veitchi) ; Somerset, v. 1920. Mr. N. Cunliffe, to whom I am indebted 

 for the specimens, reports that the plants were very heavily infested, 

 four large bushes being nearly rained by the attacks of the insects. 

 The plants were growing in the open, two of them trained against a wall. 



It is noticeable that these examples do not respond to irritation by 

 exuding drops of dark-coloured fluid, as was observed with the original 

 examples from Rihes. 



Pseudococcus toalkeri Newst. — I have found examples of this 

 species on several occasions inside the stems of grasses, where they had 

 formed their ovisacs. The insect on each occasion had crept into the 

 broken end of the stalk, where it was under such close compression that 

 the body had assumed a cylindrical form which completely plugged the 

 hollow. 



Prof. Newstead, in his description of the species (Mon. Brit. Cocc, 

 ii, p. 169), gives no particulars of the ceriferous tracts or of the cei-arial 

 spines. I find that the former are 34 in number (17 on each side of the 

 body), each of which carries a pair of spines and a group of cerifei'ous 

 pores. The pores on the frontal and anal cerarii are more; numerous and 

 crowded, as might be expected from the size of the waxy processes 

 associated with those areas. The anal cerarii are further characterized 

 by a large, circumscribed, heavily chitinized patch, and by the size of 

 the spines, which are many times larger than those on the other cerarii. 

 The second tract, on each side, is often rather obscure, and the spines 

 associated with it have a tendency to become setiform. 



Pseudococcus maritimus Ehrh. (Fig. 4.) 



Syn. Pseudococcus longispinus latipes Grreen, Ent. Mo. Mag. liii, 

 p. 264, Nov. 1917. 



The supposed variety of Ps, loncjispinus, described in this Journal 

 four years ago, is referable to maritimus. 



In my note (E. M. M., June 1920, p. 121) on the occurrence of 

 Ps. maritimus in this country, I omitted to draw attention to a 

 striking character noticeable on the third pair of legs. It will be seen 



