174 BULLETIN 99, UNITED STATES NATIONAL MUSEUM. 



Plate 26. 



Skulls of type-specimens (natural size). 



Mus gratus sungarx Heller. Adult male; Cat. No. 163487. {=Mus gratus gratw.) 

 Mus gratus soricoides Heller. Adult male; Cat. No. 183544. 

 Mus tenellus acholi Heller. Adult male; Cat. No. 164817. 

 Mus wamse Heller. Adult male; Cat. No. 161777. 



Plate 27. 



Skull of type-specimen of Cricetomys gnmbianus raineyi Heller. 

 Adult male; Cat. No. 181804. Natural size. 



Plate 28. 



Skull of type-specimen of Cricetomys gambianus enguvi Heller. 

 Adult female; Cat. No. 181805. 



Plate 29. 



Skull of type-specimen of Cricetomys gambianus osgoodi Heller. 

 Adult male; Cat. No. 181806. 



Plate 30. 



Skulls oj typ^spedmens {natural size). 



Upper figures. Mus aquilus True. Adult male; Cat. No. 34723. {^Lophuromys 

 aquilus.) 



Middle figures. Lophuroinys pyrrhus Heller. Adult male; Cat. No. 164823. •(=Lo- 

 phuromys ansorgei pyrrhus.) 



Lower figures. Lophuromys aquilus margarettx Heller. Adult male; Cat. No. 

 181793. 



Plate 31. 



Skulls oj type-specimens {natural size). 



Upper figures. Acomys hystrella Heller. Adult female; Cat. No. 164821. 

 Middle figures. Uranomys ugandce Heller. Adult male; Cat. No. 164822. 

 Lower figures. Saccostovius isiolse Heller. Adult female; Cat. No. 181803. 



Plate 32. 



Skulls oj type-specimens {natural size). 



Left. Saccostomus umbriventer Miller. Adult female; Cat. No. 162612. 

 Right. Saccostomus mearnsi Heller. Adult male; Cat. No. 162882. 

 (From Smithsonian Misc. Coll., vol. 54, No. 1925, pi. 1. 1910.) 



Plate 33. * 



Skulls oj type-specimens {natural size). 



Left. Pelomys roosevelti Heller. Adult male; Cat. No. 162881. { = Mylomys 

 roosevelli.) 



Right. Dasymys helukus Heller. Adult male; Cat. No. 162889. 

 (From Smithsonian Misc. Coll., vol. 54, No. 1924, pi. 1. 1910.) 



Plate 34. 



Skulls oj type-specimens {natural size). 



Upper figures. Dasyinys savannv^B.eller. Adult female; Cat. No. 164471. {=Da- 

 synys helukus savannus.) 



Middle figures. Dasymys helukus nigridius Hollister. Adult female; Cat. No. 

 162465. 



Lower figures. Dasymys orthos Heller. Adult male; Cat. No. 164824. 



