. Economic entomology for the . Spiracles and their protection.—a, plate-like covering of white grubs, cross-sec- tioned at b, to show how air enters; c, a toothed slit ; d, spiracle set on a teat-like process; e, conical spiracle set in a pit, protected by crossed hairs as shown at f in section ; g, lip-like spiracle ; h and z, unprotected round or slit-like openings. Fig. 19. Fig. 20.

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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublishernp, bookyear1896