(1695) BCD shows a part of the Sting as far as the Male lice thrust it out of their body , or as far as I could push it forward out of the body , the sting thus far not being covered with sinews or fleshy parts .In this sting one can see a continuous groove or cavity , as if that groove had been made to carry off some liquid out of the body towards the end of the sting when the louse wants to use it for stinging , though I have never perceived any liquid at the end of the sting .This part of the sting has been so delineated that the cavity in it is turned towards our eyes , as a result of which the sting appears straight to us .