210 ^^^^^' 



On October 3rd, 1913, whilst taking Typhlocyha debilis, of which 

 both sexes were in swarms on apple trees at Colesborne, I got a male 

 of this species ; and fifteen days later, by assiduous working, two 

 females, also from apple trees. I had no opportunity to search for it 

 in 1914. 



Z. alneti, coryli, and mali, by reason of their habitus as well as tlie 

 form of the male genitalia, form a distinct section of the genus ; and 

 whether they be regarded as distinct species or as forms of one, 

 separate names are necessary. 



Psyllopsis discr spans Flor. 

 Forceps (fig. 16) in the externo-lateral aspect hatchet-shaped, the part 

 corresponding to the blade large and broad, the stem short and slender. In the 

 interno-lateral aspect the hinder half of the blade is occupied by a sub-quadrate 

 space closely covered with black tubercles ; from the base of the inner side of 

 the stem there runs a membranous wing which ends, near the angle formed by 

 the hinder edge of the stem and the lower edge of the blade, in a large claw- 

 like black tooth ; the upper front angle of the blade bears a bunch of straight 

 black spines which are directed downward and backward ; at the base of the 

 hinder edge of the stem within there is a wide triangular membranous lobe. 

 Otherwise similar to P. fraxini. 



I found the single male from which the above particulars are taken 

 amongst a number of P. fraxini beaten by Prof. Carr from ash at 

 Upton, near Southwell, Notts. 



Psylla subferruginea sp. n. 



Similar to P. melanoneura Forst., but distinguished by the yellow-brown 

 tendency of its coloration, the yellow-brown veins, concolorous stigma, and the 

 absence of any darkening of the apical third of cell a2. The forceps (fig. 17) 

 are about half as long as the anal valve^ evenly narrowed from the base to the 

 apex, the front edge moderately convex, the hinder edge concave, its curve less 

 strong than that of the front edge. In P. melanoneura the veins on the outer 

 two-thirds are black, the stigma and the apical third of cell a2 are darker than 

 the remainder, and the forceps (fig. 18) are two-thirds as long as the anal valve, 

 and distinctly sinuate in outline. In P. nigrita, which is also like P. melanoneura, 

 the forceps (fig. 15) are two-thirds as long as the valve with their hinder edge 

 straight in the basal half and excavated in the apical half. 



P. subferruginea is common and generally distributed in Britain ; 

 it forms a small proportion of the Psyllae which one may beat from 

 any coniferous tree at any time between October and April ; but I 

 believe that its food-plant is birch, as I have found it numerous on 

 that tree in June. 



Colesborne, Cheltenham : 

 A'pril 23rd, 1915. 



