genera and species of tlic [/roup of PsijllUUe. 459 



wrinkled. Claviis pale fuscous-brown ; area enclosed be- 

 tween the marginal and claval nerves white ; costal basal 

 cell with a deep, narrow, white channel running along 

 the inner margin of the stem (vena ulnaris) to near its 

 apex, then crossing the cell diagonally and terminating 

 in the marginal nerve at the base of the stigma ; stigma 

 short, wide at its base, nerve white ; radius long, termi- 

 nating in the upper apical angle ; nerve white, almost 

 straight ; cubitus petiole about • two-thirds the length 

 of the upper arm, and about one and a half time 

 the length of the lower one ; upper furcation, measured 

 down the middle, about half the length of the arm ; 

 lower furcation, • upper branch abruptly curved at 

 the base ; distance between the apices of the branches, 

 measured on the marginal nerve, equal to the length 

 of the arm ; disc with a slightly oblique, irregular, 

 broad, white streak extending from the costal margin 

 across the stigma and terminating at the upper branch 

 of the lower arm of the cubitus ; round the apex a some- 

 what broad white stripe extending from the apex of the 

 radius to the apex of the upper branch "of the lower arm 

 of the cubitus ; dorsal marginal nerve from within the 

 apex of the claval suture dark fuscous, except where in- 

 terrupted by the apices of the white nerves of the 

 branches. Legs pale yellow. Abdomen pitchy brown, 

 shining, Length, If line (Paris). 



Psylla arctica. (PI. XIX., figs. 1 — Id). 

 AjJhalara arctica, Walker, List Horn., B. M., part 4, 



p. 931. 

 The above is a true Psylla. There are three specimens 

 (females) on one pin in the collection. I have given a 

 figure of some of the principal parts, which may be of 

 use to collectors in the far north some day. . 



TKIOZIN^. 



Petalolyma,* n. g. 

 Caput : vertex, medio emensus, dimidio oculorum 

 intervallo paulo longior. Lobi faciales elongati. Antennae 

 breves, et, prater baseos articulos duo crassos, filiformes ; 

 articulus tertius quarto longior. Oculi laterales. Thorax : 

 pronotum angustum, lateribus non ultra oculorum mar- 



* TTiTa^oi/, a leaf ; Av|M.»9, injury. 



TRANS. ENT. SOC. 1882. PART III. (SEPT.) 3 O 



