Forest entomology . as a typeof the other species. Trichiosoma tibialis (Steph.) This species is generally attached to hawthorn, and the pupalcocoons may generally be found on the twigs of switched hedges,more especially on twigs nearthe base of the hedge. Asa rule, however, the cocoonsare opened by insectivorousbirds. The collector, there-fore, should try as far aspossible to gather thesecocoons in the early autumn,and place them in a jar forhatching purposes. When Fig. tibialis, this is done, the flies are very easily reared, and they hatch out from the middle of March tothe
Forest entomology . as a typeof the other species. Trichiosoma tibialis (Steph.) This species is generally attached to hawthorn, and the pupalcocoons may generally be found on the twigs of switched hedges,more especially on twigs nearthe base of the hedge. Asa rule, however, the cocoonsare opened by insectivorousbirds. The collector, there-fore, should try as far aspossible to gather thesecocoons in the early autumn,and place them in a jar forhatching purposes. When Fig. tibialis, this is done, the flies are very easily reared, and they hatch out from the middle of March tothe end of April. Fig. 160 is from a photograph of this species, andfig. 161 is a representation of the pupa. It is best, in rearing flies from the larval stage, to try and collect, asfar as possible, the fully developed larvae, as when the larvae are col-lected at an early stage they do not feed readily in confinement, anda great proportion of them die off. Fig. 162 is a representation ofthe larvae on a hawthorn 174 FOREST ENTOMOLOGY. It should be noted that, from a systematic point of view, the speciesattached to hawthorn has hitherto been known as Trichiosoma lucorum,but modern classification associates the latter name with anotherspecies which is attached to birch-trees. This species is in every way an interesting forest insect, but inno sense whatever can it be termed an injurious insect. The largeand somewhat pretty larva may often befound on thorn hedges, when we are quietlysearching for anything of an arborealinterest. The larva (fig. 162) when young hasa greyish - white appearance, largely dueto a powdery covering, which appearsdusted over the body. As it gets olderthe colour is a blend of green withlight yellow, with a yellowish faceand black eyes. It may be lookedfor in July. It is not a voraciousfeeder. The pupa (fig. 161) is a hard browncocoon, | inch to 1 inch long, and § inchto h an inch in breadth. It opens by alid for the exit of the perfect insect. Itmay
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