. Injurious and useful insects; an introduction to the study of economic entomology. Insects; Beneficial insects; Insect pests. Mx' Lw Fig. 94,—Diagram of mouth-parts of Orthopterous insect. i86 INJURIOUS AND USEFUL INSECTS functional in adult. Antennae long. There are two pairs of membranous reticulate wings, the hind pair larger and folded fanwise. Larva aquatic. Order Orthoptera (cockroaches, grasshoppers, crickets). Mouth-parts biting. There ^ ; ^^^ are usually two pairs of ^^ ^-ii. Lbr wings, which often differ in texture, the fore pair being ' jMn firmer, and serving as wing- covers, the
. Injurious and useful insects; an introduction to the study of economic entomology. Insects; Beneficial insects; Insect pests. Mx' Lw Fig. 94,—Diagram of mouth-parts of Orthopterous insect. i86 INJURIOUS AND USEFUL INSECTS functional in adult. Antennae long. There are two pairs of membranous reticulate wings, the hind pair larger and folded fanwise. Larva aquatic. Order Orthoptera (cockroaches, grasshoppers, crickets). Mouth-parts biting. There ^ ; ^^^ are usually two pairs of ^^ ^-ii. Lbr wings, which often differ in texture, the fore pair being ' jMn firmer, and serving as wing- covers, the hind pair folded fanwise. Mxf Order Corrodentia (book- lice, bird-lice). Mouth biting. There may be two pairs of membranous and few-veined wings, but they are often wanting. Order Thysanoptera or Physopoda (thrips). Mouth-parts adapted for piercing and sucking, with palps. There are two pairs of long, narrow, membranous wings, fringed with long hairs. A resting-stage in some species. Order Rhynchota or Hemiptera (bugs, water-boatmen, aphids, scale-insects, lice). Mouth- parts suctorial, with a jointed beak or proboscis (labium), which (^ aj^ ^^ Lbr encloses piercing styles; no palps. There are usually two pairs of wings, which may be similar or dissimilar. Male Coccidse undergo complete transformation, with a resting-stage. ° ° Fig. 95.—Diagram of mouth-parts of bug. Section III. Holometabolic — undergoing complete transformation. There is a resting-stage, during which the insect rarely moves about, and never feeds. The wing-rudiments develpp within in- ternal pouches, and do not appear externally till the larval skin is cast. Order Neuroptera (lace-flies, alder-flies, scorpion-flies). Mouth-parts biting. There are two pairs of equal, similar, membranous, closely reticulate 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 perf
Size: 2156px × 1159px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsects, bookyear1902
