. A text-book of agricultural zoology. Zoology, Economic. 130 COLEOPTEEA OR BEETLES. other large ones by tlie eight black spots on the elytra being sur- rounded with a yellowish band. The genus Scymnus, another group of CoccinellidsB, also do much good by devouring scales. A minute black lady-bird (Scymnus minimus) has been recorded by Miss Ormerod as feeding on plant-lice and red-spiders as well. These useful beetles lay their creamy-white eggs (1) in the spring upon a variety of plants. They are deposited in groups closely applied together, and hatch out into the larvse in from ten to fiftee
. A text-book of agricultural zoology. Zoology, Economic. 130 COLEOPTEEA OR BEETLES. other large ones by tlie eight black spots on the elytra being sur- rounded with a yellowish band. The genus Scymnus, another group of CoccinellidsB, also do much good by devouring scales. A minute black lady-bird (Scymnus minimus) has been recorded by Miss Ormerod as feeding on plant-lice and red-spiders as well. These useful beetles lay their creamy-white eggs (1) in the spring upon a variety of plants. They are deposited in groups closely applied together, and hatch out into the larvse in from ten to fifteen days. The larvse, called "niggers" (3 and 4), are smoky black or grey, with yellow or orange and. Fig. 55.—Lady-birds (CocGiti6Uid(B). 1, Ova on leaf; 2, egg magnified; 3, larva ("nigger"); 4, natural size ; 5, 6, pupae; 7, Adalia bi-punctata; 8, variety of A. bi-punotata; 9, Ooccinella septem-punctata. (Curtis.) white markings on their bodies. They are extremely active, and pursue the plant-lice with considerable agility. The " nigger" has six jointed legs in front, and the surface of the body is more or less rough, and slightly hairy. When mature these carnivorous creatures attach themselves by their tail with silk to the under-side of the leaf, and then change into the short, plump, black and creamy-white pupa (5 and 6):.in the early summer the pupa hatches out in about two weeks into the mature lady-bird, which soon commences to carry on the good work of clearing off the fly, started during its larval career. The importance of these carnivorous allies cannot be over- estimated. The destructive scale, Icerya purchasi, which all. 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
