**3.5 The different types of sensilla**

### **3.5.1 Sensilla coeloconica**

Sensilla coeloconica 1 (S.C1) were located in a large and low lumen on both sides of the scape (Fig.2A). S.C1 was distinguished by their finger-like appearance, which characterizes it from the other sensilla. On high magnification, the sensilla appears to be formed of multiple straight tubules directed towards the antennal shaft giving a pyramidal appearance, opening at the apex with many ridges on the surface wall of the sensilla.. Each one arises from a narrow socket; the base of sensilla may be attached to the socket in some parts. The sensilla measures about 16.8 µm in length and about 11.3 µm in diameter (Fig.2A). Two subtypes of these sensilla were distinguished, on the pedicel**,** the first, Sensilla coeloconica 1 was scattered in a little numbers and have been described previously, the second, Sensilla coeloconica 2 which emerges from a well-defined socket. The fingers are long and tapering apically, some arise from sockets with tilting towards the antennal shaft, and have triangular shape. They have veins ornamented vertically on the surface of the sensilla wall. These sensilla ranged from about 30.8 to 41.3 µm in length, and about 15.8 µm in diameter (Fig.2B). Few numbers of S.C1 are distributed on the 3rd, 4th and 5 th segments of funnels on the flagellum while, S.C 3 are found on the 3rd segment of the funnel. The fingerlike processes of S. coeloconica 3 are long and fused into a blunt tip. Number of them is tapering apically, extends with the same diameter and has an elongated triangular appearance. They grow out from wide sockets and extend in a straight line on the antennal shaft (Fig.3A). These sensilla measured about 18 µm in length, and about 5 µm in diameter.
