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Fig. 4. The bristle pattern of the imaginal notum. (A) A camera lucida drawing. The large sensory bristles are indicated by black circles and the sensory scales by red circles. The acrostichal, dorsocentral, prescutellar and scutellar bristles are indicated as AC, DC, PST, SC respectively. Their number varies considerably from one animal to another. (B) A camera lucida drawing of a bristle and a scale illustrating the difference in size and shape. (C) Part of a pupal epithelium stained with anti-HRP antibody that labels neurons. Neurons and axons of the AC and DC bristles can be seen.