Entomología forestal . as de las hojas del sicómoro común (fig. 37). Isnow es conocido por el nombre de Phyllocoptes acericola, Nal., y los siguientes Connoldgives sinonimia-viz. : Phyllocoptes acericola, nal.Volvulifex aceris, Amer.Ceratoneon vulrjare, Bremi.Phytop)tus aceris, Murray. Las agallas son muy comunes en la superficie superior de las hojas ofsycamore {Acer pseudo-platanus). En algunos casos son verythinly esparcidas en la hoja, en otros casesquite gregaria. Son muy bonitos incolor, variando de naranja - amarillo a púrpura.aparecen poco después las hojas desarrollan, andmay b

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Forest entomology . ace of the leaves of the common sycamore (fig. 37). It isnow known by the name of Phyllocoptes acericola, Nal., and Connoldgives the following synonymy—viz. : Phyllocoptes acericola, Nal.Volvulifex aceris, Amer.Ceratoneon vulrjare, Bremi.Phytop)tus aceris, Murray. The galls are very common on the upper surface of the leaves ofsycamore {Acer pseudo-platanus). In some instances they are verythinly scattered over the leaf, in other casesquite gregarious. They are very beautiful incolour, varying from orange - yellow to purple.They appear soon after the leaves develop, andmay be found throughout thewhole summer season. Such are a few typical speci-mens of arboreal Eriophyidreliving in buds or forminggalls; and, as just stated, there may be many found ontrees, but with the exceptionof two species—viz., those onhazel and yew—they are notvery destructive, and certainlynot to be compared with thespecies on black currant, remarks it will be seen that the study ofThe bases of classification. Fig. 36.—Phyllocoptes carpini. a, dorsal surface ; 6, side view. (Copied from Nalepa.) From the foregoinEriophyidae is purely a microscopical oneare so minute, and the points of discrimination so difficult to deter-mine, that the question naturally and suggestively arises whetherwe have the same or different species of mite doing several kindsof injury. As bearing on the specific differences of mites found ondifferent food-plants, I may say, from practical and local examinations, that I have only once found Eriophyes ribis on black currant inNorthumberland, near Newcastle-on-Tyne, whereas the species onhazel is about as common as in Cheshire, where E. ribis is a direfulpest. Hence it would conclusively appear that the mites on the ERIOPHYIDtE or gall-mites. 35 respective food-plants are distinct species, and therefore very fastidiousas to food. Mr jNewstead, Curator of the Grosvenor Museum, Chester, carriedout a numher of observations with regard to the species on

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