material ANSP 9995/AMNH FARB 2438 are housed in the collections of the Natural History Museum in London (NHM OR50100). The casts show some detail that is no longer preserved on the original specimens which have significantly degraded due to pyrite disease. Misassigned species Laelaps trihedrodon was coined by Cope in 1877 for a partial dentary (now missing) from the Morrison Formation of Colorado. Five damaged partial tooth crowns (AMNH 5780) mistakenly thought to have belonged to the L. trihedrodon holotype share many features in common with Allosaurus and probably belong to that genus. However some of the Allosaurus-like characters of the teeth are primitive to theropods as a whole and may have been present in other large-bodied Morrison Formation theropod species. Laelaps macropus was coined by Cope for a partial hind limb found in the Navesink Formation that Joseph Leidy had referred earlier to the ornithomimid Coelosaurus, distinguishing it from Dryptosaurus by its longer toes. Thomas R. Holtz listed it as an indeterminate tyrannosauroid in his contribution to the second edition of the Dinosauria. In 2017, it was informally given the new generic name “Teihivenator”. Earlier that year, Brownstein (2017) analyzed the material of Laelaps macropus and found that only the partial tibia could be definitely classified as Tyrannosauroid and that the distal metatarsal could’ve been from an Ornithomimosaur. Brownstein also placed the pedal phalanges in Ornithimimosauria, though didn’t create a lectotype for Laelaps macropus. Description Dryptosaurus is estimated to have been long and to have weighed , although this is based on partial remains of one individual. Like its relative Eotyrannus, Dryptosaurus seems to have had relatively long arms when compared with more derived tyrannosaurs such as Tyrannosaurus. Its hands, which are also relatively large were believed to have had three fingers. Brusatte et al. (2011), however, observed an overall similarity in the shape of the available phalanges of Dryptosaurus with those of derived tyrannosaurids and noted that Dryptosaurus may have had only two functional digits. Each of its fingers were tipped by an eight-inch, talon-like claw. Its forelimb morphology suggests that forelimb reduction in tyrannosauroids may not have proceeded in a uniform fashion. Dryptosaurus may have used both its arms and its jaws and as weapons when hunting, capturing and processing prey. The type specimen is a fragmentary skeleton belonging to a single adult individual. ANSP 9995 consists of a fragmentary right maxilla, a fragmentary right dentary, a