Entomology : with special reference to its biological and economic aspects . thopJuigus;E, Chrysopa; F-I, soldier termites (after Hagen). the mandibles are used as piercing weapons; in bees (C) theyare used for various industrial purposes; in some beetles theyare large, grotesque in form and appa-rently purposeless. The mandibles ofOiithopJiagiis (D) and many other dungbeetles consist chiefly of a flexible lam-ella, admirably adapted for its specialpurpose. In Euphoria (Fig. 261), whichfeeds on pollen and the juices of ,the mandibles, and the other mouthparts as well, are densely clothe
Entomology : with special reference to its biological and economic aspects . thopJuigus;E, Chrysopa; F-I, soldier termites (after Hagen). the mandibles are used as piercing weapons; in bees (C) theyare used for various industrial purposes; in some beetles theyare large, grotesque in form and appa-rently purposeless. The mandibles ofOiithopJiagiis (D) and many other dungbeetles consist chiefly of a flexible lam-ella, admirably adapted for its specialpurpose. In Euphoria (Fig. 261), whichfeeds on pollen and the juices of ,the mandibles, and the other mouthparts as well, are densely clothed withhairs. In the larva of Chrysopa, theinner face of the mandible (Fig. 45, £)has a longitudinal groove against whichthe maxilla fits to form a canal, throughwhich the blood of plant lice is suckedinto the oesophagus. In termites {F-I)the mandibles assume curious and ofteninexplicable forms. Next in order are the maxilkc, orunder jaws, which are less powerfulthan the mandibles and more complex, consisting as theydo of several sclerites (Figs. 44, 46). Essentially, the. Maxilla of Harpaluscaliginosus, ventral as-pect, c, cardo; g, galea;/, lacinia; p, palpus; pf,palpifer; s, stipes; sg,subgalea. ANATOMY AND PHYSIOLOGY 39 maxilla consists of three lobes, namely, palpus, galea andlacinia, which are borne by a stipes, and hinged to the skullby means of a cardo. The palpus, always lateral in position,is usually four- or five-jointed and is tactile, olfactory or gus-tatory in function. The lacinia is commonly provided withteeth or spines. The maxillae supplement the mandibles byholding the food when the latter open, and help to comminutethe food. Additional maxillary sclerites, of minor impor-tance, often occur. The lahiiim, or under lip, may properly be likened to a unitedpair of maxillae, for both are formed on the same three-lobedplan. This correspondence is evidentin the cockroach, among other gener-alized insects. Thus, in this insect (Fig. 44) : Labium = = pa
Size: 1083px × 2307px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
