**3.5.2 Sensilla basiconica**

Sensilla basiconica 1 are found on the ventral side between the scape and the pedicle in one row. It is a hair with a simple bulky base and a wide socket, and this hair ending fans out into two curved parts in line with the curve of the whole sensilla. These sensilla ranged from about 12.5 to 18.8 µm in length, and ranged about 5.0 to 6.5 µm in diameter (Fig.2C). Sensilla basiconica 2 are spread in a very few number on the surface of the club. They are blunt tipped, relatively stout pegged. They are often straight and sometimes slightly curved towards the antennal shaft (Fig.3F).

#### **3.5.3 Sensilla trichodea**

They show no special arrangement except that they are more frequent on the apical and basal areas of the segmented funnily on the flagellum.

#### **3.5.3.1 Sensilla trichodea 1**

It is formed of straight hair, tapering to a fine end, growing out from a socket in the cuticle. The surface of the sensilla is smooth. It is measured about 240 µm in length and about 12.5 µm in diameter at its base (Fig.2D).

#### **3.5.3.2 Sensilla trichodea 2**

It is a straight hair and most of them are blunt-tipped while few of them are bifurcate at the terminal end (Fig.2D). The hair bases inserted tightly into a large cuticular socket and the surface of the sensilla is similar to trichodea 1. They have a mean length about 105 µm and mean diameter about 12.5 µm.

Fig. 2. SEM photomicrographs of non-irradiated adult antenna of *Rhynchophorus Ferrugineus.*  (A): Sensilla coeloconica 1 (C1) on the scape, (B): Sensilla coeloconica 2 (C2) on the pedicel, (C): Sensilla basiconica 1(B1) on the ventral side between scape and pedicel, (D): Sensilla trichodea 1, 2, 3 (T1, T2, T3), Sensilla chaetica1 (Ch1) and Cuticular pores as arrowheads on the funicle. [Scale bars indicate 100 µm (A, D) and 10 µm (B, C), respectively]
