Forest entomology . Fig. 34.— Surface of leaflets of mountain-ash (Pjrusaucuparia) injured by Eriophyes aucuparise. OR GALL-MITES. 33 Genus Moxochetus. M. sulcatus (Nal.) This genus contains a single species on beech, which is figured These most interesting galls do not appear to be common :they are very local where theyoccur. The affected leaves aresituated on the new wood ofthe year. They are attackedwhile expanding, and insteadof opening out into a flat blade,the primary offshoots from themidrib are caused to remain asnearly parallel as possible withit, and the areas
Forest entomology . Fig. 34.— Surface of leaflets of mountain-ash (Pjrusaucuparia) injured by Eriophyes aucuparise. OR GALL-MITES. 33 Genus Moxochetus. M. sulcatus (Nal.) This genus contains a single species on beech, which is figured These most interesting galls do not appear to be common :they are very local where theyoccur. The affected leaves aresituated on the new wood ofthe year. They are attackedwhile expanding, and insteadof opening out into a flat blade,the primary offshoots from themidrib are caused to remain asnearly parallel as possible withit, and the areas which theyenclose are pushed upwards,giving both sides of the leafa deeply striated continue to grow inlength, and ultimately bend in-wards, assuming a cymbiformshape. The edges of some meet and produce a pod-like to their excessive pilosity, they are like velvet to Fig. 35.—Edges of leaves of blackthorn (Pruimsspinosa) rolled inwards by species o/Eriophyes. Sub-Family In connection with this sub-family, it may be mentioned thatNalepa gives several instances of Continental mites belonging tothe respective genera of the sub-family, and associated with manyof our forest trees. It is therefore possible that we have here, so faras systematic forest entomology is concerned, a practically unworkedfield. Fig. 36, a, represents the dorsal surface, and b the side viewof Phyllocoptes carjpini The figures are specially given asshowing the variety of structure in these minute creatures, and thesuggestiveness of this field for original microscopical research. The most familiar instance, however, is the species attacking the 1 British Vegetable Galls, p. 176. 2 Prom Beitrage zur Systematik der Phytopteu, von Dr Alfred Nalepa. 1889. c 34 FOREST ENTOMOLOGY upper surface of the leaves of the common sycamore (fig. 37). It isnow known by the
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