List of the Insect F^auna of the County. 119 



connected with their reproduction and whole life cycle were 

 first studied in this country by Newport and Huxley, and at 

 the present time M. J. Lichtenstein is so patiently and suc- 

 cessfully tracing some of the Aphides through their various 

 stages of development (which is so abnormal that he has had 

 to employ a peculiar nomenclature of his own to distinguish 

 the seven buddings or pseudo-births in certain genera) that I 

 am sure the members of the Club would welcome a resume 

 of his researches, but I can now only refer them to Mr. 

 Buckton's three beautiful volumes, recently published by the 

 Eay Society,*^ and to Courchet's memoir ^^ before alluded to. 



There are several species of Trioza, a genus of Psyllidfe 

 (Homoptera), which cause swellings and rollings of leaves, 

 especially of several Compositae ; but the only gall-making 

 species yet noted as British is T. Walkeri, Forst., whose larva 

 lives in the deformed leaves of buckthorn. The common 

 terminal globularly-swollen leaves of box, so well figured by 

 Reaumur, in which the larvae of Psylla Buxi live, can hardly 

 be called a gall. 



Both the Coleoptera and Lepidoptera contain a few gall- 

 producing species. The common cabbage and other cruci- 

 ferous root-galls are familiar examples of the former, and the 

 knot-grass [Polygonum) pod-gall** of Asychna cBratella, and 

 Laverna decorella, whose larvae produce swellings in the stems 

 of various species of Ejnlobium, are the only British exponents 

 of the latter. Further than their departure of habits from 

 other members of their groups, and their special bearing on 

 the various problems connected with gall-growth generally, 

 they afford no peculiar interest from our present point of 

 view, and they will doubtless receive more attention when the 

 coleopterous or lepidopterous fauna of our county is under 

 consideration. 



*i ' Monograph of the British Aphides,' by George Bowdler Buckton, 

 F.K.S., F.L.S., F.C.S., &c. London: Printed for the Kay Society. Vols, 

 i.— iii. (1876—1881). 



*^ "Etudes sur les galles causees par les Aphidiens " par L. Courchet 

 (MontpeUier, 1879). Compare reference on p. 111. 

 <t3 ' Entomologists' Weekly IntelHgencer,' v. 81 (Dec. 11, 1858). 



