Fig. 3. Morphology of antennae and male expression of three OBPs. (A–D) Scanning electron micrographs of adult male (A,C) and female (B,D) antennae. Arrows in A point to sensilla of the peripheral (1) and mid-annular sensory (2) regions in A and C, and to a female sensillum in D. Insert diagrams in A and B indicate the structural organization of the male or female annulus; asterisks indicate scale (non-sensory) regions and hatching or solid black, sensory regions. (C) The boundary between the peripheral and mid-annular sensory regions of a male annulus; arrows identify the long trichoid sensilla (1) and the short sensilla of the mid-annular region (2). (D) A comparable region of a female antenna; the arrow points to one of many slender hair-like sensilla. Short protrusions underlying the sensilla can be seen in both C and D; these are non-sensory protrusions in the antennal cuticle. (E) Side view diagram of a male annulus, showing the distributions of olfactory sensilla (arrows) in the peripheral (left annulus) and mid-annular (right annulus) sensory regions) (Lee and Strausfeld, 1990). (F) Diagram of three male and female annuli. Sensory and scale (non-sensory, asterisk) regions are noted, as are the peripheral (black) and mid-annular (hatched) sensory regions of male and the more-or-less single homogeneous sensory region (hatched) of female. Size bar, 278 µm (A,B), 114 µm (C,D).
