1880 ]. 
G5 
DESCRIPTION OP THE NYMPH AND IMAGO OF PSYLLA PERE- 
GRIN A, FORST. 
BY JOHN SCOTT. 
In yoI. xiii, p. 13/ , of this magazine, I recorded, with a query, the 
capture of a single female of this species, and it was only in August, 
18/ 6, that I was enabled to remove the doubt by the capture of a 
numbei of specimens of both sexes on the dogwood ( Comics sanguineus') . 
Since that time I have, on two or three occasions, taken the species on 
the same bushes, but I never was fortunate enough to meet with it in 
its earlier stages. This circumstance made me somewhat incredulous 
as to the dogwood being really its food-plant, and so, before committing 
anything to paper, I resolved to wait patiently, until I had solved the 
question. This waiting has brought about the desired result, for, at 
the meeting of the K. Iv. zool.-bot. Gresellschaft in Wien, held on the 
5th November last, Dr. Franz Low laid before it a part of his 
Mittheilungen iiber Psylloden,” in which, at p. 573, of the “ Verhand- 
1 ungen, he describes the insect in its stages of nymph and imago. ITe 
there states that he found it on hawthorn (Cratcegus oxyacantha) , and, 
accordingly, I set myself to work to determine this point. Towards 
the end of May I began my search, and, since then, down to the date 
on which I now write, I have both captured on, and beaten the young 
and perfect insect from, the twigs of the above-named tree, as stated 
by him. The synonymy will stand thus: — 
Psylla peregrina, Forst., F. Low. 
„ carpini , Forst. 
„ cratccgicola , Flor (nec Forst.). 
The Ps. cratcegicola, Forst., being the same as Ps. mali, Schmid- 
berger and Forster. 
A ymph green, oval, shining, not clothed with hairs. Antennae yellowish, two or three 
apical joints black. Elytra — lobes pale yellowish, very finely wrinkled, with a 
brown, longitudinal streak down the middle, widest next the apex, and fre- 
quently indistinctly reaching the base. Legs pale greenish or yellowish, 
or the thighs only greenish. Tarsi brown. Abdomen above, green, round the 
apex scalloped, the extremities of each scallop bearing a longisli, stout, pale 
hair ; number of hairs 14 ; the upper scallop on each side wider than the others ; 
underneath green. 
Imago : summer brood green or greenish-yellow, rarely yellow ; autumn brood 
clear red or reddish-yellow. Head green or greenish-yellow, or clear red or 
reddish-yellow ; crown : posterior margin concave, width between the eyes 
about twice the length measured down the centre. Face — lobes pale given or 
yellow, reddish or reddish-yellow ; with a few pale hairs next the apex ; exterior 
margin concave, interior margin slightly convex, apex somewhat acute and 
