British species of Psi/llidcc. 547 



rally clear chocolate-brown, sometimes tlie costal marginal 

 nerve and stigma pale red or rose-pink ; dorsal margin 

 from the base to the apex of the clavus brown, terminating 

 in a short black streak, from thence to round the apex 

 yellowish- white ; nerve adjoining the apex of the clavus 

 margined with brown on both sides ; apex of the other 

 nerves and an elongate spot in the spaces enclosed by them 

 on the marginal nerve pitchy brown. Wings clear, trans- 

 parent; costal margin dark fuscous. Legs reddish or 

 reddish-brown. Thighs : 1st and 2nd pairs brown at the 

 base, 3rd entirely dark brown. Tibia reddish, slightly 

 darker at the apex. Tarsi pale red. Claws brown. 



Abdomen above black ; posterior margin of the seg- 

 ments narrowly and sides broadly bright red. 



Length l^ line. 



The only species with which the above can be confounded 

 is I*, costatopunctata, which it resembles very much in 

 the markings along the dorsal margin of the elytra. The 

 last-named, however, is narrower, paler and has different 

 formed face-lobes. Dr. Puton, in the Ann. Soc. Fr. for 

 1871, p. 437, refers P. pyrisiiga, Forst. to this species as 

 being only a variety. This appears to me to be a decided 

 mistake, as Forster does not make mention in his descrip- 

 tion of any spots on the dorsal margin of that species ; he 

 simply says : " Die Fliigel ziemlich wasserhell, mit roth- 

 lichem Stigma und ahnlich gefarbten Adern," and speci- 

 mens I have from Meyer-Diir fully bear this out. 



It would appear to be rare with us, as I have only seen 

 a single example taken by Dr. Power at Cowfold (Sussex) 

 in May, another by Mr. B. Cooke, and two others by Mr. 

 Douglas, beginning of November, on beech {Fagus syl- 

 vatica). 



Species 18. Psylla costatopunctata. 



Psylla costatopunctata^ Forst. Verh. Ver. Rheinl. v. 

 76, 20. 



Reddish-yellow, with pale yellowish-white streaks. 

 Face: lobes slightly clothed with pale hairs; shorter than 

 the crown down the centre, base broad, exterior margin 

 sloping to the bluntly-rounded apex, inner margin straight. 

 AntenncB yellow; 4 — 8 joints at the apex black, 9 — 10 

 black. Elytra somewhat clear and transparent, nerves 

 pale yellow ; costal stigma yellow, wide and long ; apex 

 of the clavus and adjoining nerve with a black dash, apex 



