PLATE 3.19. DRONE FOREWING BASE, CLOSE-UP

TOP. Drone forewing base (the head is to the top, dorsum to the right) (see Plate 3.18, top micrograph). The probable sensory receptors in the bottom three micrographs are located on the pleural plate (arrow). (x 190)

BOTTOM LEFT. Close-up of a uniquely branched hair and nonsocketed hair above on an area covered by cuticular scales. ( x 1, 175)

BOTTOM MIDDLE. Hair in the bottom left micrograph, with the field extended to show the small peglike sensillum. (x 1,700)

BOTTOM RIGHT. Higher magnification of the cuticular "peg" in the bottom middle micrograph. The peg is unusual in that it is very flattened, rather than columnar. (x 8,500)