Dromaeosaurus albertensis Matthew and Brown, 1922

Sahni, Ashok, 1972, The vertebrate Fauna of the Judith River formation, Montana, Bulletin of the American Museum of Natural History 147 (6), pp. 319-416 : 359

Dromaeosaurus albertensis Matthew and Brown, 1922

Figure 9I

Dromaeosaurus albertensis MATTHEW AND BROWN, 1922 , p. 383.

Laelaps explanatus COPE, 1876a, p. 249.

Laelapsfalculus Cope, 1876a, p. 249.

Laelaps laevifrons COPE, 1876b, p. 344.

Dromaeosaurus albertensis is a small carnivorous dinosaur described from the "Belly River Formation" of Alberta by Matthew and Brown (1922, p. 383). These authors stated that the length of the skull is one-third to one-fourth the linear size of that of Deinodon , and differs from it by "reduced number of teeth, the large premaxillary teeth and the unsymmetric form of the maxillary teeth as well as the light skull construction, large fenestrae and numerous details that might be largely associated with its small size. "

Teeth similar to those of Dromaeosaurus have been reported and figured ( Russell, 1935, fig. 9) from the Milk River Formation of Alberta. They have also been reported from the Judith River Formation (Matthew and Brown, 1922, p. 378). AMNH 8516 is referable to the genus (fig. 9I). The teeth are usually smaller versions of those of Deinodon , with relatively strongly convex anterior borders. Serrations on the posterior edge of most teeth are coarser than those on the anterior, and in some specimens the anterior crest may be completely unserrated.

Figures

FIG. 9. A, B. Edmontonia lorngiceps, AMNH 8543, lateral views of an isolated tooth, x 1. C, D. Palaeoscincus costatus, AMNH 8542, lateral views of an isolated tooth, x 12. E, F. Thescelosaurus cf. T. neglectus, AMNH 8536, lateral views of an isolated tooth, x 10. G, H. Ceratopsidae, AMNH 8540, lateral views of an unworn tooth, x 12. I. Dromaeosaurus albertensis, AMNH 8516, lateral view of an isolated tooth, x 12. J, K. Paronychodon lacustris, AMNH 98523, lateral views of an isolated tooth, x 12. L, M. Troodon formosus, AMNH 8518, lateral ~~~~~~~~~~~~~~~~~~~~~~~~~~~~3. views of an isolated tooth, x 12. N. 0,?Stegoceras validus, AMNH 8530, lateral views of an isolated tooth, x 1-. Dinosaur egg shell fragments. P. AMNH 8545, external view of shell (Class B). Q. Internal view. Both x 10. R. AMNH 8546, external view of shell (Class B). S. Internal view. Both x 10. T. AMNH 8548, external view of shell (Class C). U. Internal view. Both x 10. V. AMNH 8547, external view of shell (Class B). W. In- ternal view. Both x 10. X. AMNH 8544, external view of shell (Class A), x 10.