1880]. 65 



DESCRIPTION OF THE NYMPH AND IMAGO OF PSYLLA PERE- 

 GRIN A, FOEST. 



BY JOHN SCOTT. 



In vol. xiii, p. 137, of this magazine, I recorded, with a query, the 

 capture of a single female of this species, and it was only in August, 

 1876, that I was enabled to remove the doubt by the capture of a 

 number of specimens of both sexes on the dogwood (Cornus 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. K. zool.-bot. Gesellschaft 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 " Yerhand- 

 lungen," he describes the insect in its stages of nymph and imago. He 

 there states that he found it on hawthorn (Crataegus oxy a cant ha), 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. 

 „ cratcegicola, Flor {nee Forst.). 

 The Ps. cratcegicola, Forst., being the same as Ps. mail, Schmid- 

 berger and Forster. 



Nymph green, oval, shining, not clothed with hairs. Antennas 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 longish, 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. Mead 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 green 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 



