. Annals of applied biology. Biology, Economic; Biochemistry. Fig. 27. Fourth instar. Fig. 28. Fourth instar. of 38 pairs (Fig. 28). The mouth-parts are similar in structure to those in previous stages. Tracheal system (Fig. 29). This is much more complicated than in any previous stage, as numerous fine tracheal ramifications are present. There are dorsal and ventral systems, which are in connection. Sjnracles (Fig. 29). There are four pairs of spiracles situated as follows: a pair in the metathorax; a pair of more anterior thoracic; a pair in the first abdominal segment; and a pair at t
. Annals of applied biology. Biology, Economic; Biochemistry. Fig. 27. Fourth instar. Fig. 28. Fourth instar. of 38 pairs (Fig. 28). The mouth-parts are similar in structure to those in previous stages. Tracheal system (Fig. 29). This is much more complicated than in any previous stage, as numerous fine tracheal ramifications are present. There are dorsal and ventral systems, which are in connection. Sjnracles (Fig. 29). There are four pairs of spiracles situated as follows: a pair in the metathorax; a pair of more anterior thoracic; a pair in the first abdominal segment; and a pair at the sides of the vasiform orifice. Legs (Fig. 30). They are not functional for walking, and consist of three segments, the basal one being very broad. No spines are present. Antennae (Fig. 31). Each consists of two segments, the distal one terminating in a rather fine 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 Association of Applied Biologists; Association of Economic Biologists. [Wellesbourne, Warwick, etc. ] Association of Applied Biologists [etc. ]
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