560 Mr. John Scott's Moiinrjrapli of the 



Thorax: ■pronoUim narrow, more or less deflected or 

 almost horizontal, with two fbveie on each side frequently 

 connected by a channel ; lateral margins rounded, almost 

 in a line with the outer margin of the eyes. Mesonotwm 

 as in Psylla and Trioza, Elytra semi-transparent, 

 rounded at the ajiex ; cubitus petiolate, the petiole about 

 \ tlic length of the lower arm ; stigma obsolete. 



Ixesembles Psylla through having a rounded apex to 

 the elytra and the cubitus ])etiolate, and Trioza through 

 its having no stigma : and it differs from both in the shape 

 of the head and the two slightly thickened terminal joints 

 of the antenna). 



Species 1. Aphalara exilis. 

 Tettiyonia exilis, Weber et jNIohr, Nat. Keise, Q5, t. 1, 



tig. 2 (1804) ; Chermes exilis, Fallen, Hem. Suec. 



ii. 80 ; Aphalara exilis, Forst. Verb. Ver. Kheinl. v. 



89, 2; Flor, liliyn. Livl. ii. 532, 1; Leth. Hem. 



Nord, ed. ii. 94, 1. 

 Greyish-yellow, orange or reddish-yellow, with paler 

 streaks on the mesonotum. Antennoi pale yellow or 

 sometimes whitish; 1 — 2 and 9 — 10 joints black. Elytra 

 white, transparent, more or less thickly sprinkled Avith 

 fuscous or fuscous-black spots, which are more or less 

 confluent; before the apex a broad transverse fuscous- 

 black band more or less interrupted. 



Head: crown in front on each side of the channel 

 slightly produced into a lobe with roimded top. Antennoi 

 pale yellow or sometimes whitish ; 1st joint entirely and 

 base of the 2nd black; 9 — 10 black. 



Thorax : -jtronotum pale ; mesonotum greyish-yellow 

 or reddish-yellow ; posterior portion Avith four jnile, more 

 or less distinct in certain individuals, longitudinal lines. 

 Elytra. Avhite, transparent, with a somcAvhat frosted aj)- 

 pearance Avhen the insect is in repose, more or less thickly 

 sprinkled with fuscous or fuscous-black spots, Avhich are 

 more or less confluent; before the apex a broad transverse 

 fuscous-black band, generally more or less interrupted and 

 spotted with the ground colour ; dorsal margin with three 

 fuscous or fuscous-black patches, placed, one a short dis- 

 tance from the base, one a short distance from the apex of 

 the clavus, and the ord margining the nerve adjoining the 

 latter; nerves Avhite or yellow. Leys yoWow. IViiyhs in 

 the middle broadly dark brown or l)lack. Claws dark 

 brown. 



