. Entomology for medical officers. Insect pests; Insects as carriers of disease. Fio. 110.—Venation of Pyralid. Fig. 111.—Pyralisfarinalis, enlarged. the fore wings. They can be distinguished, if the wings be mounted in Canada balsam so as to make the scales trans- parent, by the wing-venation (Fig. i lo). The larvae, which are usually naked and dingy coloured, protect themselves with silky threads and entangled debris; some of them do great damage to stored grain, flour, etc., one of the most notorious being Pyralis farinalis, the adult of which is shown in Fig. in. Fumigation with carbon bis
. Entomology for medical officers. Insect pests; Insects as carriers of disease. Fio. 110.—Venation of Pyralid. Fig. 111.—Pyralisfarinalis, enlarged. the fore wings. They can be distinguished, if the wings be mounted in Canada balsam so as to make the scales trans- parent, by the wing-venation (Fig. i lo). The larvae, which are usually naked and dingy coloured, protect themselves with silky threads and entangled debris; some of them do great damage to stored grain, flour, etc., one of the most notorious being Pyralis farinalis, the adult of which is shown in Fig. in. Fumigation with carbon bisulphide has been recommended for infested granaries and mills; but it must not be forgotten that this compound is explosive. Tineidce. An enormous family of small or minute moths, usually with narrow, shiny wings having particularly broad fringes; the broad-winged species must be distinguished. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Alcock, A. (Alfred), 1859-1933. London, Gurney & Jackson
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