The Xindi-Insectoid scout ship was a type of warp-capable scout ship used by the Xindi-Insectoids. The vessel was much smaller than most Xindi ships, and only carried a crew of three.
A ship of this type attacked the United Earth starship Enterprise during its mission in the Delphic Expanse in early 2154. It proved no match for the NX-class starship and tried to escape, but Enterprise destroyed it to prevent the Insectoids from reporting their position. (ENT: "Hatchery")
In the final draft script of "Hatchery", the only physical description of the Insectoid scout ship was that it be "small". Despite this, the craft's destruction was scripted to be shown with "a massive fireball", though the on-screen explosion is much more contained.
This ship type appears in the video game Star Trek Online as the "Castroi-class" fighter ship, and is deployed by the Xindi-Insectoid starship (named the "Olaen-class Heavy Escort Carrier" in-game).