Sylvester's trademark is his sloppy and yet stridulating lisp. The moth flies from June to July depending on the location stridulating on the wing. The vestigial tegmina are horny, almost without veins, and without stridulating organs. For example, both genera have stridulating hairs in the same locations. Male mole crickets sing by stridulating, always underground. Araneids have eight similar eyes, hairy or spiny legs, and no stridulating organs. The forward-facing (prolateral) sides of the maxillae have "thorns", which act as a stridulating organ. The palm of the claws also possess stridulating (sound-producing) ridges which they use for communication. Some scorpions in addition produce deimatic noises by stridulating with the pedipalps and first legs. As they become more agitated, this stridulating behavior becomes faster and louder. Stridulating warns foes that a retreat is occupied and attempting to enter is unwise.