The Xindi-Insectoid scout ship was a type of starship 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")
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).