Forest entomology . s gener-ally found on isolated trees, orotherwise extremely local onhedgerow trees. It is found ontrees of varying ages, from fifteenyears upwards, but most abund-antly on trees from thirty toforty years of age with compara-tively smooth bark. When it isfound on old trees, it is sparselyscattered in the fissures of therough bark. The general appear-ance of this scale somewhat re-sembles the genus Dadylopius ormealy bug, inasmuch as the barkis spotted with numerous white specks (fig. 222). If an individualsac be examined during the winter months, it will be found tocontain t
Forest entomology . s gener-ally found on isolated trees, orotherwise extremely local onhedgerow trees. It is found ontrees of varying ages, from fifteenyears upwards, but most abund-antly on trees from thirty toforty years of age with compara-tively smooth bark. When it isfound on old trees, it is sparselyscattered in the fissures of therough bark. The general appear-ance of this scale somewhat re-sembles the genus Dadylopius ormealy bug, inasmuch as the barkis spotted with numerous white specks (fig. 222). If an individualsac be examined during the winter months, it will be found tocontain two or more female insects. The adult female is of a bright-red colour, somewhat globular inshape, with six-jointed antennas, short legs, and very long rostralfilaments. A microscopical examination of a prepared female insect,under high power, reveals special rings of spines surrounding the analorifice, and a few tubular spinnerets on the dorsal surface. The male is apterous, of a bright-red orange colour, with black. Fig. 222.—Apterococcus fraxini on bark of ash. 239 eyes. The antennae show seven and sometimes eight joints, and atthe junction of the third and fourth joint a curious ball-and-socketarrangement may be seen. The genital armature is comparativelyshort. The males appear in considerable numbers during October andNovember, and during the day may be seen actively moving on thebark. I found the larvae hatching out in Derbyshire about the latter endof June 1906, and about a fortnight later of the same year in North-umberland. References to Literature consulted. Cockerell, T. D. A. Notes on the Geographical Distribution of Institute. 1895. Comstock, J. H. Report on Scale-Insects. 1881. Douglas, J. W. Some British and Exotic Coccidfe. E. M. M. 1891. Euller, Claude. Articles in Australian Papers. Howard, L. 0., and Marlatt, C. L. The San Jose Scale. Bulletin, No. Hunter, S. J. Scale-Insects Injurious to Orchards. University
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