PLATE 1.19. QUEEN FOREWING BASE

TOP Forewing base showing a variety of hair types. Some functional inferences can be drawn, based on the size and position of the hairs. Short and long trichoid sensilla may have an exoreceptive function and respond (bend) to wind shear forces. The long ones may also be proprioceptive in nature if they contact the pleural surface when the wing is upright and inform the central nervous system of wing attitude. The body hairs are probably not innervated. Chemosensory pit organs are also present. Behind the pits (lop) is an axillary sclerite that articulates with a portion of the pleuron. (x270)

BOTTOM Higher magnification of the pits and short trichoids at the wing base. A pit in the lower center of the field appears to have a recessed dome (arrow) and may be a campaniform sensillum. The hair and the pit may both house sensory neurons capable of monitoring the wing flexion. (x 3,600)