Area 51 UFO: XCom

Pegasus Hobbies AREA 51 UFO. Obviously a ship to be used by the Greys
Though the most common incursion craft used, these are not to be taken lightly. They can drop rapidly from orbit and land within a matter of minutes. Top speed is unknown due to apparent jamming technologies disabling our long range radar though estimates put it at over mach 4. The come in several variants, though are indistinguishable unless observed up close.
The Harvester variant uses a Ventral tractor beam to scoop victims out of off of city streets during low fly-overs. This version is susceptible to cannon and small arms fire, but the tractor is effective at deflecting missiles.
The Recon-in-Fource variant mounts one of various under slung fully gimbald direct fire weapons (typically some sort of rail gun or plasma cannon) with a range and fire power comparable to a mid-sized naval vessel's cannons. These are vulnerable to long range missiles, but are otherwise too maneuverable for long range projectile weaponry, and nothing survives getting close if it is spotted. Interceptors are advised to fire long range missiles at the first opportunity and retreat. If the missiles never make it to target assume its a harvester and close range.