(77) 



TKicHorxKRVGin.E fotind in Japan h[i Mr. G. Licwis ; l)y tlic 

 liev. A. Matthews, M.A. 



The species of Triclioptcrijgid'.v found by Mr. Lewis in Ja])au 

 exhibit a curious combiDation of the European with tlie tropical 

 type. The former is represented by the common T. (/j-am/iccllis 

 and T. fasciila. To judge by the very numerous examples of 

 T. J'liscula in Mr. Lewis's collection, that species hitherto only 

 known only by a single specimen taken many years ago by 

 myself in Leicestei-shire, appears to be the most common of all 

 the Japanese Trichopterygida;. The tropical type is exemplified 

 by T. ciirsifans, and especially by T. Leirisii. a large and very 

 tine species, which 1 have named in honour of its captor ; this 

 insect seems to be almost as abiuidant as T. fuscida.. 



Besides those ali-eady mentioned T. Japonica and Camptodrnm 

 adnstipcnne are very interesting. It is difficult to determuie 

 ■whether T. Japonica is a distinct species, or merely a race t)f the 

 European T. rai-iolasa, in colour and especially in their very 

 remarkable sculpture they are precisely alike, but the Japanese 

 insect is not one-half as large as the European, and in outhnc 

 almost resembles a Pi// ;'«»?, being long and narrow, while the 

 other is short and broad. Since these diffei-ences are persistent 

 through the whole series of eight specimens, I have determined 

 to sejiarate this form from 7'. variolosa, for, even if they shoiald 

 eventually prove to be merely varieties of the same species, the 

 name "' Japonica" Avill be demonstrative as well as applicable. 



I cannot see how the trinomial system can be objected to in 

 such a case as this; it seems to be the only way to convey an 

 idea of individual jjeculiarity ; to call this insect 7'. variolosa 

 would utterly bewilder any one conversant with the Eurojieau 

 form, and on the other hand any one acquauitcd only with the 

 Japanese would never recognise the European examples, for 

 Avithout the aid of a compound powei' tlie superficial sculjiture 

 can scarcely be seen. 



